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bzr commit into Mariadb 5.2, with Maria 2.0:maria/5.2 branch (igor:2739) WL#2771

To: maria-developers@xxxxxxxxxxxxxxxxxxx
From: Igor Babaev <igor@xxxxxxxxxxxx>
Date: Sun, 20 Dec 2009 18:26:26 -0800 (PST)
User-agent: Bazaar (1.18.1)
#At lp:maria/5.2 based on revid:psergey@xxxxxxxxxxxx-20091216092851-9ehou85ydmgziniy

 2739 Igor Babaev	2009-12-20
      Backport into MariaDB-5.2 the following:
      WL#2771 "Block Nested Loop Join and Batched Key Access Join"
      added:
        mysql-test/r/join_cache.result
        mysql-test/r/join_nested_jcl6.result
        mysql-test/r/join_outer_jcl6.result
        mysql-test/r/select_jcl6.result
        mysql-test/t/join_cache.test
        mysql-test/t/join_nested_jcl6.test
        mysql-test/t/join_outer_jcl6.test
        mysql-test/t/select_jcl6.test
        sql/sql_join_cache.cc
      modified:
        libmysqld/CMakeLists.txt
        libmysqld/Makefile.am
        mysql-test/r/index_merge_myisam.result
        mysql-test/r/join_outer.result
        mysql-test/r/table_elim.result
        sql/CMakeLists.txt
        sql/Makefile.am
        sql/ds_mrr.cc
        sql/field.cc
        sql/item.cc
        sql/item.h
        sql/mysqld.cc
        sql/set_var.cc
        sql/sql_class.h
        sql/sql_select.cc
        sql/sql_select.h
        storage/myisam/ha_myisam.cc

=== modified file 'libmysqld/CMakeLists.txt'
--- a/libmysqld/CMakeLists.txt	2009-12-15 22:37:39 +0000
+++ b/libmysqld/CMakeLists.txt	2009-12-21 02:26:15 +0000
@@ -123,7 +123,8 @@ SET(LIBMYSQLD_SOURCES emb_qcache.cc libm
            ../sql/sql_class.cc ../sql/sql_crypt.cc ../sql/sql_cursor.cc 
            ../sql/sql_db.cc ../sql/sql_delete.cc ../sql/sql_derived.cc 
            ../sql/sql_do.cc ../sql/sql_error.cc ../sql/sql_handler.cc 
-           ../sql/sql_help.cc ../sql/sql_insert.cc ../sql/sql_lex.cc 
+           ../sql/sql_help.cc ../sql/sql_insert.cc ../sql/sql_join_cache.cc
+           ../sql/sql_lex.cc 
            ../sql/sql_list.cc ../sql/sql_load.cc ../sql/sql_locale.cc 
            ../sql/sql_binlog.cc ../sql/sql_manager.cc ../sql/sql_map.cc 
            ../sql/sql_parse.cc ../sql/sql_partition.cc ../sql/sql_plugin.cc 

=== modified file 'libmysqld/Makefile.am'
--- a/libmysqld/Makefile.am	2009-12-15 07:16:46 +0000
+++ b/libmysqld/Makefile.am	2009-12-21 02:26:15 +0000
@@ -63,6 +63,7 @@ sqlsources = ds_mrr.cc derror.cc field.c
 	sql_profile.cc \
 	sql_analyse.cc sql_base.cc sql_cache.cc sql_class.cc \
 	sql_crypt.cc sql_db.cc sql_delete.cc sql_error.cc sql_insert.cc \
+        sql_join_cache.cc \
 	sql_lex.cc sql_list.cc sql_manager.cc sql_map.cc \
 	scheduler.cc sql_connect.cc sql_parse.cc \
 	sql_prepare.cc sql_derived.cc sql_rename.cc \

=== modified file 'mysql-test/r/index_merge_myisam.result'
--- a/mysql-test/r/index_merge_myisam.result	2009-12-15 07:16:46 +0000
+++ b/mysql-test/r/index_merge_myisam.result	2009-12-21 02:26:15 +0000
@@ -342,8 +342,6 @@ create table t4 (a int);
 insert into t4 values (1),(4),(3);
 set @save_join_buffer_size=@@join_buffer_size;
 set join_buffer_size= 4000;
-Warnings:
-Warning	1292	Truncated incorrect join_buffer_size value: '4000'
 explain select max(A.key1 + B.key1 + A.key2 + B.key2 + A.key3 + B.key3 + A.key4 + B.key4 + A.key5 + B.key5)
 from t0 as A force index(i1,i2), t0 as B force index (i1,i2)
 where (A.key1 < 500000 or A.key2 < 3)

=== added file 'mysql-test/r/join_cache.result'
--- a/mysql-test/r/join_cache.result	1970-01-01 00:00:00 +0000
+++ b/mysql-test/r/join_cache.result	2009-12-21 02:26:15 +0000
@@ -0,0 +1,4144 @@
+DROP TABLE IF EXISTS t1,t2,t3,t4,t5,t6,t7,t8,t9,t10,t11;
+DROP DATABASE IF EXISTS world;
+set names utf8;
+CREATE DATABASE world;
+use world;
+CREATE TABLE Country (
+Code char(3) NOT NULL default '',
+Name char(52) NOT NULL default '',
+SurfaceArea float(10,2) NOT NULL default '0.00',
+Population int(11) NOT NULL default '0',
+Capital int(11) default NULL
+);
+CREATE TABLE City (
+ID int(11) NOT NULL,
+Name char(35) NOT NULL default '',
+Country char(3) NOT NULL default '',
+Population int(11) NOT NULL default '0'
+);
+CREATE TABLE CountryLanguage (
+Country char(3) NOT NULL default '',
+Language char(30) NOT NULL default '',
+Percentage float(3,1) NOT NULL default '0.0'
+);
+SELECT COUNT(*) FROM Country;
+COUNT(*)
+239
+SELECT COUNT(*) FROM City;
+COUNT(*)
+4079
+SELECT COUNT(*) FROM CountryLanguage;
+COUNT(*)
+984
+show variables like 'join_buffer_size';
+Variable_name	Value
+join_buffer_size	131072
+show variables like 'join_cache_level';
+Variable_name	Value
+join_cache_level	1
+EXPLAIN
+SELECT City.Name, Country.Name FROM City,Country
+WHERE City.Country=Country.Code AND 
+Country.Name LIKE 'L%' AND City.Population > 100000;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	Country	ALL	NULL	NULL	NULL	NULL	239	Using where
+1	SIMPLE	City	ALL	NULL	NULL	NULL	NULL	4079	Using where; Using join buffer
+SELECT City.Name, Country.Name FROM City,Country
+WHERE City.Country=Country.Code AND 
+Country.Name LIKE 'L%' AND City.Population > 100000;
+Name	Name
+Vientiane	Laos
+Riga	Latvia
+Daugavpils	Latvia
+Maseru	Lesotho
+Beirut	Lebanon
+Tripoli	Lebanon
+Monrovia	Liberia
+Tripoli	Libyan Arab Jamahiriya
+Bengasi	Libyan Arab Jamahiriya
+Misrata	Libyan Arab Jamahiriya
+Vilnius	Lithuania
+Kaunas	Lithuania
+Klaipeda	Lithuania
+?iauliai	Lithuania
+Panevezys	Lithuania
+EXPLAIN
+SELECT City.Name, Country.Name, CountryLanguage.Language
+FROM City,Country,CountryLanguage
+WHERE City.Country=Country.Code AND
+CountryLanguage.Country=Country.Code AND
+City.Name LIKE 'L%' AND Country.Population > 3000000 AND
+CountryLanguage.Percentage > 50;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	Country	ALL	NULL	NULL	NULL	NULL	239	Using where
+1	SIMPLE	CountryLanguage	ALL	NULL	NULL	NULL	NULL	984	Using where; Using join buffer
+1	SIMPLE	City	ALL	NULL	NULL	NULL	NULL	4079	Using where; Using join buffer
+SELECT City.Name, Country.Name, CountryLanguage.Language
+FROM City,Country,CountryLanguage
+WHERE City.Country=Country.Code AND
+CountryLanguage.Country=Country.Code AND
+City.Name LIKE 'L%' AND Country.Population > 3000000 AND
+CountryLanguage.Percentage > 50;
+Name	Name	Language
+Leiden	Netherlands	Dutch
+La Matanza	Argentina	Spanish
+Lomas de Zamora	Argentina	Spanish
+La Plata	Argentina	Spanish
+Lanús	Argentina	Spanish
+Las Heras	Argentina	Spanish
+La Rioja	Argentina	Spanish
+Liège	Belgium	Dutch
+La Paz	Bolivia	Spanish
+Londrina	Brazil	Portuguese
+Limeira	Brazil	Portuguese
+Lages	Brazil	Portuguese
+Luziânia	Brazil	Portuguese
+Lauro de Freitas	Brazil	Portuguese
+Linhares	Brazil	Portuguese
+London	United Kingdom	English
+Liverpool	United Kingdom	English
+Leeds	United Kingdom	English
+Leicester	United Kingdom	English
+Luton	United Kingdom	English
+Los Angeles	Chile	Spanish
+La Serena	Chile	Spanish
+La Romana	Dominican Republic	Spanish
+Loja	Ecuador	Spanish
+Luxor	Egypt	Arabic
+Las Palmas de Gran Canaria	Spain	Spanish
+L´Hospitalet de Llobregat	Spain	Spanish
+Leganés	Spain	Spanish
+León	Spain	Spanish
+Logroño	Spain	Spanish
+Lleida (Lérida)	Spain	Spanish
+Le-Cap-Haïtien	Haiti	Haiti Creole
+La Ceiba	Honduras	Spanish
+Livorno	Italy	Italian
+Latina	Italy	Italian
+Lecce	Italy	Italian
+La Spezia	Italy	Italian
+Linz	Austria	German
+London	Canada	English
+Laval	Canada	English
+Longueuil	Canada	English
+Lanzhou	China	Chinese
+Luoyang	China	Chinese
+Liuzhou	China	Chinese
+Liaoyang	China	Chinese
+Liupanshui	China	Chinese
+Liaoyuan	China	Chinese
+Lianyungang	China	Chinese
+Leshan	China	Chinese
+Linyi	China	Chinese
+Luzhou	China	Chinese
+Laiwu	China	Chinese
+Liaocheng	China	Chinese
+Laizhou	China	Chinese
+Linfen	China	Chinese
+Liangcheng	China	Chinese
+Longkou	China	Chinese
+Langfang	China	Chinese
+Liu´an	China	Chinese
+Longjing	China	Chinese
+Lengshuijiang	China	Chinese
+Laiyang	China	Chinese
+Longyan	China	Chinese
+Linhe	China	Chinese
+Leiyang	China	Chinese
+Loudi	China	Chinese
+Luohe	China	Chinese
+Linqing	China	Chinese
+Laohekou	China	Chinese
+Linchuan	China	Chinese
+Lhasa	China	Chinese
+Lianyuan	China	Chinese
+Liyang	China	Chinese
+Liling	China	Chinese
+Linhai	China	Chinese
+Larisa	Greece	Greek
+La Habana	Cuba	Spanish
+Lilongwe	Malawi	Chichewa
+León	Mexico	Spanish
+La Paz	Mexico	Spanish
+La Paz	Mexico	Spanish
+Lázaro Cárdenas	Mexico	Spanish
+Lagos de Moreno	Mexico	Spanish
+Lerdo	Mexico	Spanish
+Los Cabos	Mexico	Spanish
+Lerma	Mexico	Spanish
+Las Margaritas	Mexico	Spanish
+Lashio (Lasho)	Myanmar	Burmese
+Lalitapur	Nepal	Nepali
+León	Nicaragua	Spanish
+Lambaré	Paraguay	Spanish
+Lima	Peru	Spanish
+Lisboa	Portugal	Portuguese
+Lódz	Poland	Polish
+Lublin	Poland	Polish
+Legnica	Poland	Polish
+Lyon	France	French
+Le Havre	France	French
+Lille	France	French
+Le Mans	France	French
+Limoges	France	French
+Linköping	Sweden	Swedish
+Lund	Sweden	Swedish
+Leipzig	Germany	German
+Lübeck	Germany	German
+Ludwigshafen am Rhein	Germany	German
+Leverkusen	Germany	German
+Lünen	Germany	German
+Lahti	Finland	Finnish
+Lausanne	Switzerland	German
+Latakia	Syria	Arabic
+Luchou	Taiwan	Min
+Lungtan	Taiwan	Min
+Liberec	Czech Republic	Czech
+Lviv	Ukraine	Ukrainian
+Lugansk	Ukraine	Ukrainian
+Lutsk	Ukraine	Ukrainian
+Lysyt?ansk	Ukraine	Ukrainian
+Lower Hutt	New Zealand	English
+Lida	Belarus	Belorussian
+Los Teques	Venezuela	Spanish
+Lipetsk	Russian Federation	Russian
+Ljubertsy	Russian Federation	Russian
+Leninsk-Kuznetski	Russian Federation	Russian
+Long Xuyen	Vietnam	Vietnamese
+Los Angeles	United States	English
+Las Vegas	United States	English
+Long Beach	United States	English
+Lexington-Fayette	United States	English
+Louisville	United States	English
+Lincoln	United States	English
+Lubbock	United States	English
+Little Rock	United States	English
+Laredo	United States	English
+Lakewood	United States	English
+Lansing	United States	English
+Lancaster	United States	English
+Lafayette	United States	English
+Lowell	United States	English
+Livonia	United States	English
+set join_cache_level=2;
+show variables like 'join_cache_level';
+Variable_name	Value
+join_cache_level	2
+EXPLAIN
+SELECT City.Name, Country.Name FROM City,Country
+WHERE City.Country=Country.Code AND 
+Country.Name LIKE 'L%' AND City.Population > 100000;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	Country	ALL	NULL	NULL	NULL	NULL	239	Using where
+1	SIMPLE	City	ALL	NULL	NULL	NULL	NULL	4079	Using where; Using join buffer
+SELECT City.Name, Country.Name FROM City,Country
+WHERE City.Country=Country.Code AND 
+Country.Name LIKE 'L%' AND City.Population > 100000;
+Name	Name
+Vientiane	Laos
+Riga	Latvia
+Daugavpils	Latvia
+Maseru	Lesotho
+Beirut	Lebanon
+Tripoli	Lebanon
+Monrovia	Liberia
+Tripoli	Libyan Arab Jamahiriya
+Bengasi	Libyan Arab Jamahiriya
+Misrata	Libyan Arab Jamahiriya
+Vilnius	Lithuania
+Kaunas	Lithuania
+Klaipeda	Lithuania
+?iauliai	Lithuania
+Panevezys	Lithuania
+EXPLAIN
+SELECT City.Name, Country.Name, CountryLanguage.Language
+FROM City,Country,CountryLanguage
+WHERE City.Country=Country.Code AND
+CountryLanguage.Country=Country.Code AND
+City.Name LIKE 'L%' AND Country.Population > 3000000 AND
+CountryLanguage.Percentage > 50;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	Country	ALL	NULL	NULL	NULL	NULL	239	Using where
+1	SIMPLE	CountryLanguage	ALL	NULL	NULL	NULL	NULL	984	Using where; Using join buffer
+1	SIMPLE	City	ALL	NULL	NULL	NULL	NULL	4079	Using where; Using join buffer
+SELECT City.Name, Country.Name, CountryLanguage.Language
+FROM City,Country,CountryLanguage
+WHERE City.Country=Country.Code AND
+CountryLanguage.Country=Country.Code AND
+City.Name LIKE 'L%' AND Country.Population > 3000000 AND
+CountryLanguage.Percentage > 50;
+Name	Name	Language
+Leiden	Netherlands	Dutch
+La Matanza	Argentina	Spanish
+Lomas de Zamora	Argentina	Spanish
+La Plata	Argentina	Spanish
+Lanús	Argentina	Spanish
+Las Heras	Argentina	Spanish
+La Rioja	Argentina	Spanish
+Liège	Belgium	Dutch
+La Paz	Bolivia	Spanish
+Londrina	Brazil	Portuguese
+Limeira	Brazil	Portuguese
+Lages	Brazil	Portuguese
+Luziânia	Brazil	Portuguese
+Lauro de Freitas	Brazil	Portuguese
+Linhares	Brazil	Portuguese
+London	United Kingdom	English
+Liverpool	United Kingdom	English
+Leeds	United Kingdom	English
+Leicester	United Kingdom	English
+Luton	United Kingdom	English
+Los Angeles	Chile	Spanish
+La Serena	Chile	Spanish
+La Romana	Dominican Republic	Spanish
+Loja	Ecuador	Spanish
+Luxor	Egypt	Arabic
+Las Palmas de Gran Canaria	Spain	Spanish
+L´Hospitalet de Llobregat	Spain	Spanish
+Leganés	Spain	Spanish
+León	Spain	Spanish
+Logroño	Spain	Spanish
+Lleida (Lérida)	Spain	Spanish
+Le-Cap-Haïtien	Haiti	Haiti Creole
+La Ceiba	Honduras	Spanish
+Livorno	Italy	Italian
+Latina	Italy	Italian
+Lecce	Italy	Italian
+La Spezia	Italy	Italian
+Linz	Austria	German
+London	Canada	English
+Laval	Canada	English
+Longueuil	Canada	English
+Lanzhou	China	Chinese
+Luoyang	China	Chinese
+Liuzhou	China	Chinese
+Liaoyang	China	Chinese
+Liupanshui	China	Chinese
+Liaoyuan	China	Chinese
+Lianyungang	China	Chinese
+Leshan	China	Chinese
+Linyi	China	Chinese
+Luzhou	China	Chinese
+Laiwu	China	Chinese
+Liaocheng	China	Chinese
+Laizhou	China	Chinese
+Linfen	China	Chinese
+Liangcheng	China	Chinese
+Longkou	China	Chinese
+Langfang	China	Chinese
+Liu´an	China	Chinese
+Longjing	China	Chinese
+Lengshuijiang	China	Chinese
+Laiyang	China	Chinese
+Longyan	China	Chinese
+Linhe	China	Chinese
+Leiyang	China	Chinese
+Loudi	China	Chinese
+Luohe	China	Chinese
+Linqing	China	Chinese
+Laohekou	China	Chinese
+Linchuan	China	Chinese
+Lhasa	China	Chinese
+Lianyuan	China	Chinese
+Liyang	China	Chinese
+Liling	China	Chinese
+Linhai	China	Chinese
+Larisa	Greece	Greek
+La Habana	Cuba	Spanish
+Lilongwe	Malawi	Chichewa
+León	Mexico	Spanish
+La Paz	Mexico	Spanish
+La Paz	Mexico	Spanish
+Lázaro Cárdenas	Mexico	Spanish
+Lagos de Moreno	Mexico	Spanish
+Lerdo	Mexico	Spanish
+Los Cabos	Mexico	Spanish
+Lerma	Mexico	Spanish
+Las Margaritas	Mexico	Spanish
+Lashio (Lasho)	Myanmar	Burmese
+Lalitapur	Nepal	Nepali
+León	Nicaragua	Spanish
+Lambaré	Paraguay	Spanish
+Lima	Peru	Spanish
+Lisboa	Portugal	Portuguese
+Lódz	Poland	Polish
+Lublin	Poland	Polish
+Legnica	Poland	Polish
+Lyon	France	French
+Le Havre	France	French
+Lille	France	French
+Le Mans	France	French
+Limoges	France	French
+Linköping	Sweden	Swedish
+Lund	Sweden	Swedish
+Leipzig	Germany	German
+Lübeck	Germany	German
+Ludwigshafen am Rhein	Germany	German
+Leverkusen	Germany	German
+Lünen	Germany	German
+Lahti	Finland	Finnish
+Lausanne	Switzerland	German
+Latakia	Syria	Arabic
+Luchou	Taiwan	Min
+Lungtan	Taiwan	Min
+Liberec	Czech Republic	Czech
+Lviv	Ukraine	Ukrainian
+Lugansk	Ukraine	Ukrainian
+Lutsk	Ukraine	Ukrainian
+Lysyt?ansk	Ukraine	Ukrainian
+Lower Hutt	New Zealand	English
+Lida	Belarus	Belorussian
+Los Teques	Venezuela	Spanish
+Lipetsk	Russian Federation	Russian
+Ljubertsy	Russian Federation	Russian
+Leninsk-Kuznetski	Russian Federation	Russian
+Long Xuyen	Vietnam	Vietnamese
+Los Angeles	United States	English
+Las Vegas	United States	English
+Long Beach	United States	English
+Lexington-Fayette	United States	English
+Louisville	United States	English
+Lincoln	United States	English
+Lubbock	United States	English
+Little Rock	United States	English
+Laredo	United States	English
+Lakewood	United States	English
+Lansing	United States	English
+Lancaster	United States	English
+Lafayette	United States	English
+Lowell	United States	English
+Livonia	United States	English
+set join_cache_level=default;
+set join_buffer_size=256;
+show variables like 'join_buffer_size';
+Variable_name	Value
+join_buffer_size	256
+show variables like 'join_cache_level';
+Variable_name	Value
+join_cache_level	1
+EXPLAIN
+SELECT City.Name, Country.Name FROM City,Country
+WHERE City.Country=Country.Code AND 
+Country.Name LIKE 'L%' AND City.Population > 100000;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	Country	ALL	NULL	NULL	NULL	NULL	239	Using where
+1	SIMPLE	City	ALL	NULL	NULL	NULL	NULL	4079	Using where; Using join buffer
+SELECT City.Name, Country.Name FROM City,Country
+WHERE City.Country=Country.Code AND 
+Country.Name LIKE 'L%' AND City.Population > 100000;
+Name	Name
+Vientiane	Laos
+Riga	Latvia
+Daugavpils	Latvia
+Maseru	Lesotho
+Beirut	Lebanon
+Tripoli	Lebanon
+Monrovia	Liberia
+Tripoli	Libyan Arab Jamahiriya
+Bengasi	Libyan Arab Jamahiriya
+Misrata	Libyan Arab Jamahiriya
+Vilnius	Lithuania
+Kaunas	Lithuania
+Klaipeda	Lithuania
+?iauliai	Lithuania
+Panevezys	Lithuania
+EXPLAIN
+SELECT City.Name, Country.Name, CountryLanguage.Language
+FROM City,Country,CountryLanguage
+WHERE City.Country=Country.Code AND
+CountryLanguage.Country=Country.Code AND
+City.Name LIKE 'L%' AND Country.Population > 3000000 AND
+CountryLanguage.Percentage > 50;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	Country	ALL	NULL	NULL	NULL	NULL	239	Using where
+1	SIMPLE	CountryLanguage	ALL	NULL	NULL	NULL	NULL	984	Using where; Using join buffer
+1	SIMPLE	City	ALL	NULL	NULL	NULL	NULL	4079	Using where; Using join buffer
+SELECT City.Name, Country.Name, CountryLanguage.Language
+FROM City,Country,CountryLanguage
+WHERE City.Country=Country.Code AND
+CountryLanguage.Country=Country.Code AND
+City.Name LIKE 'L%' AND Country.Population > 3000000 AND
+CountryLanguage.Percentage > 50;
+Name	Name	Language
+Leiden	Netherlands	Dutch
+La Matanza	Argentina	Spanish
+Lomas de Zamora	Argentina	Spanish
+La Plata	Argentina	Spanish
+Lanús	Argentina	Spanish
+Las Heras	Argentina	Spanish
+La Rioja	Argentina	Spanish
+Liège	Belgium	Dutch
+La Paz	Bolivia	Spanish
+Londrina	Brazil	Portuguese
+Limeira	Brazil	Portuguese
+Lages	Brazil	Portuguese
+Luziânia	Brazil	Portuguese
+Lauro de Freitas	Brazil	Portuguese
+Linhares	Brazil	Portuguese
+London	United Kingdom	English
+Liverpool	United Kingdom	English
+Leeds	United Kingdom	English
+Leicester	United Kingdom	English
+Luton	United Kingdom	English
+Los Angeles	Chile	Spanish
+La Serena	Chile	Spanish
+La Romana	Dominican Republic	Spanish
+Loja	Ecuador	Spanish
+Luxor	Egypt	Arabic
+Las Palmas de Gran Canaria	Spain	Spanish
+L´Hospitalet de Llobregat	Spain	Spanish
+Leganés	Spain	Spanish
+León	Spain	Spanish
+Logroño	Spain	Spanish
+Lleida (Lérida)	Spain	Spanish
+Le-Cap-Haïtien	Haiti	Haiti Creole
+La Ceiba	Honduras	Spanish
+Livorno	Italy	Italian
+Latina	Italy	Italian
+Lecce	Italy	Italian
+La Spezia	Italy	Italian
+Linz	Austria	German
+London	Canada	English
+Laval	Canada	English
+Longueuil	Canada	English
+Lanzhou	China	Chinese
+Luoyang	China	Chinese
+Liuzhou	China	Chinese
+Liaoyang	China	Chinese
+Liupanshui	China	Chinese
+Liaoyuan	China	Chinese
+Lianyungang	China	Chinese
+Leshan	China	Chinese
+Linyi	China	Chinese
+Luzhou	China	Chinese
+Laiwu	China	Chinese
+Liaocheng	China	Chinese
+Laizhou	China	Chinese
+Linfen	China	Chinese
+Liangcheng	China	Chinese
+Longkou	China	Chinese
+Langfang	China	Chinese
+Liu´an	China	Chinese
+Longjing	China	Chinese
+Lengshuijiang	China	Chinese
+Laiyang	China	Chinese
+Longyan	China	Chinese
+Linhe	China	Chinese
+Leiyang	China	Chinese
+Loudi	China	Chinese
+Luohe	China	Chinese
+Linqing	China	Chinese
+Laohekou	China	Chinese
+Linchuan	China	Chinese
+Lhasa	China	Chinese
+Lianyuan	China	Chinese
+Liyang	China	Chinese
+Liling	China	Chinese
+Linhai	China	Chinese
+Larisa	Greece	Greek
+La Habana	Cuba	Spanish
+Lilongwe	Malawi	Chichewa
+León	Mexico	Spanish
+La Paz	Mexico	Spanish
+La Paz	Mexico	Spanish
+Lázaro Cárdenas	Mexico	Spanish
+Lagos de Moreno	Mexico	Spanish
+Lerdo	Mexico	Spanish
+Los Cabos	Mexico	Spanish
+Lerma	Mexico	Spanish
+Las Margaritas	Mexico	Spanish
+Lashio (Lasho)	Myanmar	Burmese
+Lalitapur	Nepal	Nepali
+León	Nicaragua	Spanish
+Lambaré	Paraguay	Spanish
+Lima	Peru	Spanish
+Lisboa	Portugal	Portuguese
+Lódz	Poland	Polish
+Lublin	Poland	Polish
+Legnica	Poland	Polish
+Lyon	France	French
+Le Havre	France	French
+Lille	France	French
+Le Mans	France	French
+Limoges	France	French
+Linköping	Sweden	Swedish
+Lund	Sweden	Swedish
+Leipzig	Germany	German
+Lübeck	Germany	German
+Ludwigshafen am Rhein	Germany	German
+Leverkusen	Germany	German
+Lünen	Germany	German
+Lahti	Finland	Finnish
+Lausanne	Switzerland	German
+Latakia	Syria	Arabic
+Luchou	Taiwan	Min
+Lungtan	Taiwan	Min
+Liberec	Czech Republic	Czech
+Lviv	Ukraine	Ukrainian
+Lugansk	Ukraine	Ukrainian
+Lutsk	Ukraine	Ukrainian
+Lysyt?ansk	Ukraine	Ukrainian
+Lower Hutt	New Zealand	English
+Lida	Belarus	Belorussian
+Los Teques	Venezuela	Spanish
+Lipetsk	Russian Federation	Russian
+Ljubertsy	Russian Federation	Russian
+Leninsk-Kuznetski	Russian Federation	Russian
+Long Xuyen	Vietnam	Vietnamese
+Los Angeles	United States	English
+Las Vegas	United States	English
+Long Beach	United States	English
+Lexington-Fayette	United States	English
+Louisville	United States	English
+Lincoln	United States	English
+Lubbock	United States	English
+Little Rock	United States	English
+Laredo	United States	English
+Lakewood	United States	English
+Lansing	United States	English
+Lancaster	United States	English
+Lafayette	United States	English
+Lowell	United States	English
+Livonia	United States	English
+set join_cache_level=2;
+show variables like 'join_cache_level';
+Variable_name	Value
+join_cache_level	2
+EXPLAIN
+SELECT City.Name, Country.Name FROM City,Country
+WHERE City.Country=Country.Code AND 
+Country.Name LIKE 'L%' AND City.Population > 100000;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	Country	ALL	NULL	NULL	NULL	NULL	239	Using where
+1	SIMPLE	City	ALL	NULL	NULL	NULL	NULL	4079	Using where; Using join buffer
+SELECT City.Name, Country.Name FROM City,Country
+WHERE City.Country=Country.Code AND 
+Country.Name LIKE 'L%' AND City.Population > 100000;
+Name	Name
+Vientiane	Laos
+Riga	Latvia
+Daugavpils	Latvia
+Maseru	Lesotho
+Beirut	Lebanon
+Tripoli	Lebanon
+Monrovia	Liberia
+Tripoli	Libyan Arab Jamahiriya
+Bengasi	Libyan Arab Jamahiriya
+Misrata	Libyan Arab Jamahiriya
+Vilnius	Lithuania
+Kaunas	Lithuania
+Klaipeda	Lithuania
+?iauliai	Lithuania
+Panevezys	Lithuania
+EXPLAIN
+SELECT City.Name, Country.Name, CountryLanguage.Language
+FROM City,Country,CountryLanguage
+WHERE City.Country=Country.Code AND
+CountryLanguage.Country=Country.Code AND
+City.Name LIKE 'L%' AND Country.Population > 3000000 AND
+CountryLanguage.Percentage > 50;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	Country	ALL	NULL	NULL	NULL	NULL	239	Using where
+1	SIMPLE	CountryLanguage	ALL	NULL	NULL	NULL	NULL	984	Using where; Using join buffer
+1	SIMPLE	City	ALL	NULL	NULL	NULL	NULL	4079	Using where; Using join buffer
+SELECT City.Name, Country.Name, CountryLanguage.Language
+FROM City,Country,CountryLanguage
+WHERE City.Country=Country.Code AND
+CountryLanguage.Country=Country.Code AND
+City.Name LIKE 'L%' AND Country.Population > 3000000 AND
+CountryLanguage.Percentage > 50;
+Name	Name	Language
+Leiden	Netherlands	Dutch
+La Matanza	Argentina	Spanish
+Lomas de Zamora	Argentina	Spanish
+La Plata	Argentina	Spanish
+Lanús	Argentina	Spanish
+Las Heras	Argentina	Spanish
+La Rioja	Argentina	Spanish
+Liège	Belgium	Dutch
+La Paz	Bolivia	Spanish
+Londrina	Brazil	Portuguese
+Limeira	Brazil	Portuguese
+Lages	Brazil	Portuguese
+Luziânia	Brazil	Portuguese
+Lauro de Freitas	Brazil	Portuguese
+Linhares	Brazil	Portuguese
+London	United Kingdom	English
+Liverpool	United Kingdom	English
+Leeds	United Kingdom	English
+Leicester	United Kingdom	English
+Luton	United Kingdom	English
+Los Angeles	Chile	Spanish
+La Serena	Chile	Spanish
+La Romana	Dominican Republic	Spanish
+Loja	Ecuador	Spanish
+Luxor	Egypt	Arabic
+Las Palmas de Gran Canaria	Spain	Spanish
+L´Hospitalet de Llobregat	Spain	Spanish
+Leganés	Spain	Spanish
+León	Spain	Spanish
+Logroño	Spain	Spanish
+Lleida (Lérida)	Spain	Spanish
+Le-Cap-Haïtien	Haiti	Haiti Creole
+La Ceiba	Honduras	Spanish
+Livorno	Italy	Italian
+Latina	Italy	Italian
+Lecce	Italy	Italian
+La Spezia	Italy	Italian
+Linz	Austria	German
+London	Canada	English
+Laval	Canada	English
+Longueuil	Canada	English
+Lanzhou	China	Chinese
+Luoyang	China	Chinese
+Liuzhou	China	Chinese
+Liaoyang	China	Chinese
+Liupanshui	China	Chinese
+Liaoyuan	China	Chinese
+Lianyungang	China	Chinese
+Leshan	China	Chinese
+Linyi	China	Chinese
+Luzhou	China	Chinese
+Laiwu	China	Chinese
+Liaocheng	China	Chinese
+Laizhou	China	Chinese
+Linfen	China	Chinese
+Liangcheng	China	Chinese
+Longkou	China	Chinese
+Langfang	China	Chinese
+Liu´an	China	Chinese
+Longjing	China	Chinese
+Lengshuijiang	China	Chinese
+Laiyang	China	Chinese
+Longyan	China	Chinese
+Linhe	China	Chinese
+Leiyang	China	Chinese
+Loudi	China	Chinese
+Luohe	China	Chinese
+Linqing	China	Chinese
+Laohekou	China	Chinese
+Linchuan	China	Chinese
+Lhasa	China	Chinese
+Lianyuan	China	Chinese
+Liyang	China	Chinese
+Liling	China	Chinese
+Linhai	China	Chinese
+Larisa	Greece	Greek
+La Habana	Cuba	Spanish
+Lilongwe	Malawi	Chichewa
+León	Mexico	Spanish
+La Paz	Mexico	Spanish
+La Paz	Mexico	Spanish
+Lázaro Cárdenas	Mexico	Spanish
+Lagos de Moreno	Mexico	Spanish
+Lerdo	Mexico	Spanish
+Los Cabos	Mexico	Spanish
+Lerma	Mexico	Spanish
+Las Margaritas	Mexico	Spanish
+Lashio (Lasho)	Myanmar	Burmese
+Lalitapur	Nepal	Nepali
+León	Nicaragua	Spanish
+Lambaré	Paraguay	Spanish
+Lima	Peru	Spanish
+Lisboa	Portugal	Portuguese
+Lódz	Poland	Polish
+Lublin	Poland	Polish
+Legnica	Poland	Polish
+Lyon	France	French
+Le Havre	France	French
+Lille	France	French
+Le Mans	France	French
+Limoges	France	French
+Linköping	Sweden	Swedish
+Lund	Sweden	Swedish
+Leipzig	Germany	German
+Lübeck	Germany	German
+Ludwigshafen am Rhein	Germany	German
+Leverkusen	Germany	German
+Lünen	Germany	German
+Lahti	Finland	Finnish
+Lausanne	Switzerland	German
+Latakia	Syria	Arabic
+Luchou	Taiwan	Min
+Lungtan	Taiwan	Min
+Liberec	Czech Republic	Czech
+Lviv	Ukraine	Ukrainian
+Lugansk	Ukraine	Ukrainian
+Lutsk	Ukraine	Ukrainian
+Lysyt?ansk	Ukraine	Ukrainian
+Lower Hutt	New Zealand	English
+Lida	Belarus	Belorussian
+Los Teques	Venezuela	Spanish
+Lipetsk	Russian Federation	Russian
+Ljubertsy	Russian Federation	Russian
+Leninsk-Kuznetski	Russian Federation	Russian
+Long Xuyen	Vietnam	Vietnamese
+Los Angeles	United States	English
+Las Vegas	United States	English
+Long Beach	United States	English
+Lexington-Fayette	United States	English
+Louisville	United States	English
+Lincoln	United States	English
+Lubbock	United States	English
+Little Rock	United States	English
+Laredo	United States	English
+Lakewood	United States	English
+Lansing	United States	English
+Lancaster	United States	English
+Lafayette	United States	English
+Lowell	United States	English
+Livonia	United States	English
+set join_cache_level=default;
+set join_buffer_size=default;
+show variables like 'join_buffer_size';
+Variable_name	Value
+join_buffer_size	131072
+show variables like 'join_cache_level';
+Variable_name	Value
+join_cache_level	1
+DROP DATABASE world;
+CREATE DATABASE world;
+use world;
+CREATE TABLE Country (
+Code char(3) NOT NULL default '',
+Name char(52) NOT NULL default '',
+SurfaceArea float(10,2) NOT NULL default '0.00',
+Population int(11) NOT NULL default '0',
+Capital int(11) default NULL,
+PRIMARY KEY  (Code),
+UNIQUE INDEX (Name)
+);
+CREATE TABLE City (
+ID int(11) NOT NULL auto_increment,
+Name char(35) NOT NULL default '',
+Country char(3) NOT NULL default '',
+Population int(11) NOT NULL default '0',
+PRIMARY KEY  (ID),
+INDEX (Population),
+INDEX (Country) 
+);
+CREATE TABLE CountryLanguage (
+Country char(3) NOT NULL default '',
+Language char(30) NOT NULL default '',
+Percentage float(3,1) NOT NULL default '0.0',
+PRIMARY KEY  (Country, Language),
+INDEX (Percentage)
+);
+show variables like 'join_buffer_size';
+Variable_name	Value
+join_buffer_size	131072
+set join_cache_level=5;
+show variables like 'join_cache_level';
+Variable_name	Value
+join_cache_level	5
+EXPLAIN
+SELECT City.Name, Country.Name FROM City,Country
+WHERE City.Country=Country.Code AND 
+Country.Name LIKE 'L%' AND City.Population > 100000;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	Country	range	PRIMARY,Name	Name	52	NULL	10	Using index condition; Using MRR
+1	SIMPLE	City	ref	Population,Country	Country	3	world.Country.Code	18	Using where; Using join buffer
+SELECT City.Name, Country.Name FROM City,Country
+WHERE City.Country=Country.Code AND 
+Country.Name LIKE 'L%' AND City.Population > 100000;
+Name	Name
+Vientiane	Laos
+Riga	Latvia
+Daugavpils	Latvia
+Maseru	Lesotho
+Beirut	Lebanon
+Tripoli	Lebanon
+Monrovia	Liberia
+Tripoli	Libyan Arab Jamahiriya
+Bengasi	Libyan Arab Jamahiriya
+Misrata	Libyan Arab Jamahiriya
+Vilnius	Lithuania
+Kaunas	Lithuania
+Klaipeda	Lithuania
+?iauliai	Lithuania
+Panevezys	Lithuania
+EXPLAIN
+SELECT City.Name, Country.Name, CountryLanguage.Language
+FROM City,Country,CountryLanguage
+WHERE City.Country=Country.Code AND
+CountryLanguage.Country=Country.Code AND
+City.Name LIKE 'L%' AND Country.Population > 3000000 AND
+CountryLanguage.Percentage > 50;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	CountryLanguage	ALL	PRIMARY,Percentage	NULL	NULL	NULL	984	Using where
+1	SIMPLE	Country	eq_ref	PRIMARY	PRIMARY	3	world.CountryLanguage.Country	1	Using where; Using join buffer
+1	SIMPLE	City	ref	Country	Country	3	world.Country.Code	18	Using index condition(BKA); Using where; Using join buffer
+SELECT City.Name, Country.Name, CountryLanguage.Language
+FROM City,Country,CountryLanguage
+WHERE City.Country=Country.Code AND
+CountryLanguage.Country=Country.Code AND
+City.Name LIKE 'L%' AND Country.Population > 3000000 AND
+CountryLanguage.Percentage > 50;
+Name	Name	Language
+Leiden	Netherlands	Dutch
+La Matanza	Argentina	Spanish
+Lomas de Zamora	Argentina	Spanish
+La Plata	Argentina	Spanish
+Lanús	Argentina	Spanish
+Las Heras	Argentina	Spanish
+La Rioja	Argentina	Spanish
+Liège	Belgium	Dutch
+La Paz	Bolivia	Spanish
+Londrina	Brazil	Portuguese
+Limeira	Brazil	Portuguese
+Lages	Brazil	Portuguese
+Luziânia	Brazil	Portuguese
+Lauro de Freitas	Brazil	Portuguese
+Linhares	Brazil	Portuguese
+London	United Kingdom	English
+Liverpool	United Kingdom	English
+Leeds	United Kingdom	English
+Leicester	United Kingdom	English
+Luton	United Kingdom	English
+Los Angeles	Chile	Spanish
+La Serena	Chile	Spanish
+La Romana	Dominican Republic	Spanish
+Loja	Ecuador	Spanish
+Luxor	Egypt	Arabic
+Las Palmas de Gran Canaria	Spain	Spanish
+L´Hospitalet de Llobregat	Spain	Spanish
+Leganés	Spain	Spanish
+León	Spain	Spanish
+Logroño	Spain	Spanish
+Lleida (Lérida)	Spain	Spanish
+Le-Cap-Haïtien	Haiti	Haiti Creole
+La Ceiba	Honduras	Spanish
+Livorno	Italy	Italian
+Latina	Italy	Italian
+Lecce	Italy	Italian
+La Spezia	Italy	Italian
+Linz	Austria	German
+London	Canada	English
+Laval	Canada	English
+Longueuil	Canada	English
+Lanzhou	China	Chinese
+Luoyang	China	Chinese
+Liuzhou	China	Chinese
+Liaoyang	China	Chinese
+Liupanshui	China	Chinese
+Liaoyuan	China	Chinese
+Lianyungang	China	Chinese
+Leshan	China	Chinese
+Linyi	China	Chinese
+Luzhou	China	Chinese
+Laiwu	China	Chinese
+Liaocheng	China	Chinese
+Laizhou	China	Chinese
+Linfen	China	Chinese
+Liangcheng	China	Chinese
+Longkou	China	Chinese
+Langfang	China	Chinese
+Liu´an	China	Chinese
+Longjing	China	Chinese
+Lengshuijiang	China	Chinese
+Laiyang	China	Chinese
+Longyan	China	Chinese
+Linhe	China	Chinese
+Leiyang	China	Chinese
+Loudi	China	Chinese
+Luohe	China	Chinese
+Linqing	China	Chinese
+Laohekou	China	Chinese
+Linchuan	China	Chinese
+Lhasa	China	Chinese
+Lianyuan	China	Chinese
+Liyang	China	Chinese
+Liling	China	Chinese
+Linhai	China	Chinese
+Larisa	Greece	Greek
+La Habana	Cuba	Spanish
+Lilongwe	Malawi	Chichewa
+León	Mexico	Spanish
+La Paz	Mexico	Spanish
+La Paz	Mexico	Spanish
+Lázaro Cárdenas	Mexico	Spanish
+Lagos de Moreno	Mexico	Spanish
+Lerdo	Mexico	Spanish
+Los Cabos	Mexico	Spanish
+Lerma	Mexico	Spanish
+Las Margaritas	Mexico	Spanish
+Lashio (Lasho)	Myanmar	Burmese
+Lalitapur	Nepal	Nepali
+León	Nicaragua	Spanish
+Lambaré	Paraguay	Spanish
+Lima	Peru	Spanish
+Lisboa	Portugal	Portuguese
+Lódz	Poland	Polish
+Lublin	Poland	Polish
+Legnica	Poland	Polish
+Lyon	France	French
+Le Havre	France	French
+Lille	France	French
+Le Mans	France	French
+Limoges	France	French
+Linköping	Sweden	Swedish
+Lund	Sweden	Swedish
+Leipzig	Germany	German
+Lübeck	Germany	German
+Ludwigshafen am Rhein	Germany	German
+Leverkusen	Germany	German
+Lünen	Germany	German
+Lahti	Finland	Finnish
+Lausanne	Switzerland	German
+Latakia	Syria	Arabic
+Luchou	Taiwan	Min
+Lungtan	Taiwan	Min
+Liberec	Czech Republic	Czech
+Lviv	Ukraine	Ukrainian
+Lugansk	Ukraine	Ukrainian
+Lutsk	Ukraine	Ukrainian
+Lysyt?ansk	Ukraine	Ukrainian
+Lower Hutt	New Zealand	English
+Lida	Belarus	Belorussian
+Los Teques	Venezuela	Spanish
+Lipetsk	Russian Federation	Russian
+Ljubertsy	Russian Federation	Russian
+Leninsk-Kuznetski	Russian Federation	Russian
+Long Xuyen	Vietnam	Vietnamese
+Los Angeles	United States	English
+Las Vegas	United States	English
+Long Beach	United States	English
+Lexington-Fayette	United States	English
+Louisville	United States	English
+Lincoln	United States	English
+Lubbock	United States	English
+Little Rock	United States	English
+Laredo	United States	English
+Lakewood	United States	English
+Lansing	United States	English
+Lancaster	United States	English
+Lafayette	United States	English
+Lowell	United States	English
+Livonia	United States	English
+# !!!NB igor: after backporting the SJ code the following should return
+# EXPLAIN
+# SELECT Name FROM City
+# WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
+# City.Population > 100000;
+# id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+# 1	PRIMARY	Country	range	PRIMARY,Name	Name	52	NULL	10	Using index condition; Using MRR
+# 1	PRIMARY	City	ref	Population,Country	Country	3	world.Country.Code	18	Using where; Using join buffer
+EXPLAIN
+SELECT Name FROM City
+WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
+City.Population > 100000;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	PRIMARY	City	ALL	Population	NULL	NULL	NULL	4079	Using where
+2	DEPENDENT SUBQUERY	Country	unique_subquery	PRIMARY,Name	PRIMARY	3	func	1	Using where
+SELECT Name FROM City
+WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
+City.Population > 100000;
+Name
+Vientiane
+Riga
+Daugavpils
+Maseru
+Beirut
+Tripoli
+Monrovia
+Tripoli
+Bengasi
+Misrata
+Vilnius
+Kaunas
+Klaipeda
+?iauliai
+Panevezys
+EXPLAIN
+SELECT Country.Name, IF(ISNULL(CountryLanguage.Country), NULL, CountryLanguage.Percentage)
+FROM Country LEFT JOIN CountryLanguage ON
+(CountryLanguage.Country=Country.Code AND Language='English')
+WHERE 
+Country.Population > 10000000;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	Country	ALL	NULL	NULL	NULL	NULL	239	Using where
+1	SIMPLE	CountryLanguage	eq_ref	PRIMARY	PRIMARY	33	world.Country.Code,const	1	Using where; Using join buffer
+SELECT Country.Name, IF(ISNULL(CountryLanguage.Country), NULL, CountryLanguage.Percentage)
+FROM Country LEFT JOIN CountryLanguage ON
+(CountryLanguage.Country=Country.Code AND Language='English')
+WHERE 
+Country.Population > 10000000;
+Name	IF(ISNULL(CountryLanguage.Country), NULL, CountryLanguage.Percentage)
+Australia	81.2
+United Kingdom	97.3
+Canada	60.4
+United States	86.2
+Zimbabwe	2.2
+Japan	0.1
+South Africa	8.5
+Malaysia	1.6
+Afghanistan	NULL
+Netherlands	NULL
+Algeria	NULL
+Angola	NULL
+Argentina	NULL
+Bangladesh	NULL
+Belgium	NULL
+Brazil	NULL
+Burkina Faso	NULL
+Chile	NULL
+Ecuador	NULL
+Egypt	NULL
+Spain	NULL
+Ethiopia	NULL
+Philippines	NULL
+Ghana	NULL
+Guatemala	NULL
+Indonesia	NULL
+India	NULL
+Iraq	NULL
+Iran	NULL
+Italy	NULL
+Yemen	NULL
+Yugoslavia	NULL
+Cambodia	NULL
+Cameroon	NULL
+Kazakstan	NULL
+Kenya	NULL
+China	NULL
+Colombia	NULL
+Congo, The Democratic Republic of the	NULL
+North Korea	NULL
+South Korea	NULL
+Greece	NULL
+Cuba	NULL
+Madagascar	NULL
+Malawi	NULL
+Mali	NULL
+Morocco	NULL
+Mexico	NULL
+Mozambique	NULL
+Myanmar	NULL
+Nepal	NULL
+Niger	NULL
+Nigeria	NULL
+Côte d?Ivoire	NULL
+Pakistan	NULL
+Peru	NULL
+Poland	NULL
+France	NULL
+Romania	NULL
+Germany	NULL
+Saudi Arabia	NULL
+Somalia	NULL
+Sri Lanka	NULL
+Sudan	NULL
+Syria	NULL
+Taiwan	NULL
+Tanzania	NULL
+Thailand	NULL
+Czech Republic	NULL
+Turkey	NULL
+Uganda	NULL
+Ukraine	NULL
+Hungary	NULL
+Uzbekistan	NULL
+Belarus	NULL
+Venezuela	NULL
+Russian Federation	NULL
+Vietnam	NULL
+set join_cache_level=6;
+show variables like 'join_cache_level';
+Variable_name	Value
+join_cache_level	6
+EXPLAIN
+SELECT City.Name, Country.Name FROM City,Country
+WHERE City.Country=Country.Code AND 
+Country.Name LIKE 'L%' AND City.Population > 100000;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	Country	range	PRIMARY,Name	Name	52	NULL	10	Using index condition; Using MRR
+1	SIMPLE	City	ref	Population,Country	Country	3	world.Country.Code	18	Using where; Using join buffer
+SELECT City.Name, Country.Name FROM City,Country
+WHERE City.Country=Country.Code AND 
+Country.Name LIKE 'L%' AND City.Population > 100000;
+Name	Name
+Vientiane	Laos
+Riga	Latvia
+Daugavpils	Latvia
+Maseru	Lesotho
+Beirut	Lebanon
+Tripoli	Lebanon
+Monrovia	Liberia
+Tripoli	Libyan Arab Jamahiriya
+Bengasi	Libyan Arab Jamahiriya
+Misrata	Libyan Arab Jamahiriya
+Vilnius	Lithuania
+Kaunas	Lithuania
+Klaipeda	Lithuania
+?iauliai	Lithuania
+Panevezys	Lithuania
+EXPLAIN
+SELECT City.Name, Country.Name, CountryLanguage.Language
+FROM City,Country,CountryLanguage
+WHERE City.Country=Country.Code AND
+CountryLanguage.Country=Country.Code AND
+City.Name LIKE 'L%' AND Country.Population > 3000000 AND
+CountryLanguage.Percentage > 50;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	CountryLanguage	ALL	PRIMARY,Percentage	NULL	NULL	NULL	984	Using where
+1	SIMPLE	Country	eq_ref	PRIMARY	PRIMARY	3	world.CountryLanguage.Country	1	Using where; Using join buffer
+1	SIMPLE	City	ref	Country	Country	3	world.Country.Code	18	Using index condition(BKA); Using where; Using join buffer
+SELECT City.Name, Country.Name, CountryLanguage.Language
+FROM City,Country,CountryLanguage
+WHERE City.Country=Country.Code AND
+CountryLanguage.Country=Country.Code AND
+City.Name LIKE 'L%' AND Country.Population > 3000000 AND
+CountryLanguage.Percentage > 50;
+Name	Name	Language
+Leiden	Netherlands	Dutch
+La Matanza	Argentina	Spanish
+Lomas de Zamora	Argentina	Spanish
+La Plata	Argentina	Spanish
+Lanús	Argentina	Spanish
+Las Heras	Argentina	Spanish
+La Rioja	Argentina	Spanish
+Liège	Belgium	Dutch
+La Paz	Bolivia	Spanish
+Londrina	Brazil	Portuguese
+Limeira	Brazil	Portuguese
+Lages	Brazil	Portuguese
+Luziânia	Brazil	Portuguese
+Lauro de Freitas	Brazil	Portuguese
+Linhares	Brazil	Portuguese
+London	United Kingdom	English
+Liverpool	United Kingdom	English
+Leeds	United Kingdom	English
+Leicester	United Kingdom	English
+Luton	United Kingdom	English
+Los Angeles	Chile	Spanish
+La Serena	Chile	Spanish
+La Romana	Dominican Republic	Spanish
+Loja	Ecuador	Spanish
+Luxor	Egypt	Arabic
+Las Palmas de Gran Canaria	Spain	Spanish
+L´Hospitalet de Llobregat	Spain	Spanish
+Leganés	Spain	Spanish
+León	Spain	Spanish
+Logroño	Spain	Spanish
+Lleida (Lérida)	Spain	Spanish
+Le-Cap-Haïtien	Haiti	Haiti Creole
+La Ceiba	Honduras	Spanish
+Livorno	Italy	Italian
+Latina	Italy	Italian
+Lecce	Italy	Italian
+La Spezia	Italy	Italian
+Linz	Austria	German
+London	Canada	English
+Laval	Canada	English
+Longueuil	Canada	English
+Lanzhou	China	Chinese
+Luoyang	China	Chinese
+Liuzhou	China	Chinese
+Liaoyang	China	Chinese
+Liupanshui	China	Chinese
+Liaoyuan	China	Chinese
+Lianyungang	China	Chinese
+Leshan	China	Chinese
+Linyi	China	Chinese
+Luzhou	China	Chinese
+Laiwu	China	Chinese
+Liaocheng	China	Chinese
+Laizhou	China	Chinese
+Linfen	China	Chinese
+Liangcheng	China	Chinese
+Longkou	China	Chinese
+Langfang	China	Chinese
+Liu´an	China	Chinese
+Longjing	China	Chinese
+Lengshuijiang	China	Chinese
+Laiyang	China	Chinese
+Longyan	China	Chinese
+Linhe	China	Chinese
+Leiyang	China	Chinese
+Loudi	China	Chinese
+Luohe	China	Chinese
+Linqing	China	Chinese
+Laohekou	China	Chinese
+Linchuan	China	Chinese
+Lhasa	China	Chinese
+Lianyuan	China	Chinese
+Liyang	China	Chinese
+Liling	China	Chinese
+Linhai	China	Chinese
+Larisa	Greece	Greek
+La Habana	Cuba	Spanish
+Lilongwe	Malawi	Chichewa
+León	Mexico	Spanish
+La Paz	Mexico	Spanish
+La Paz	Mexico	Spanish
+Lázaro Cárdenas	Mexico	Spanish
+Lagos de Moreno	Mexico	Spanish
+Lerdo	Mexico	Spanish
+Los Cabos	Mexico	Spanish
+Lerma	Mexico	Spanish
+Las Margaritas	Mexico	Spanish
+Lashio (Lasho)	Myanmar	Burmese
+Lalitapur	Nepal	Nepali
+León	Nicaragua	Spanish
+Lambaré	Paraguay	Spanish
+Lima	Peru	Spanish
+Lisboa	Portugal	Portuguese
+Lódz	Poland	Polish
+Lublin	Poland	Polish
+Legnica	Poland	Polish
+Lyon	France	French
+Le Havre	France	French
+Lille	France	French
+Le Mans	France	French
+Limoges	France	French
+Linköping	Sweden	Swedish
+Lund	Sweden	Swedish
+Leipzig	Germany	German
+Lübeck	Germany	German
+Ludwigshafen am Rhein	Germany	German
+Leverkusen	Germany	German
+Lünen	Germany	German
+Lahti	Finland	Finnish
+Lausanne	Switzerland	German
+Latakia	Syria	Arabic
+Luchou	Taiwan	Min
+Lungtan	Taiwan	Min
+Liberec	Czech Republic	Czech
+Lviv	Ukraine	Ukrainian
+Lugansk	Ukraine	Ukrainian
+Lutsk	Ukraine	Ukrainian
+Lysyt?ansk	Ukraine	Ukrainian
+Lower Hutt	New Zealand	English
+Lida	Belarus	Belorussian
+Los Teques	Venezuela	Spanish
+Lipetsk	Russian Federation	Russian
+Ljubertsy	Russian Federation	Russian
+Leninsk-Kuznetski	Russian Federation	Russian
+Long Xuyen	Vietnam	Vietnamese
+Los Angeles	United States	English
+Las Vegas	United States	English
+Long Beach	United States	English
+Lexington-Fayette	United States	English
+Louisville	United States	English
+Lincoln	United States	English
+Lubbock	United States	English
+Little Rock	United States	English
+Laredo	United States	English
+Lakewood	United States	English
+Lansing	United States	English
+Lancaster	United States	English
+Lafayette	United States	English
+Lowell	United States	English
+Livonia	United States	English
+# !!!NB igor: after backporting the SJ code the following should return
+# EXPLAIN
+# SELECT Name FROM City
+# WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
+# City.Population > 100000;
+# id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+# 1	PRIMARY	Country	range	PRIMARY,Name	Name	52	NULL	10	Using index condition; Using MRR
+# 1	PRIMARY	City	ref	Population,Country	Country	3	world.Country.Code	18	Using where; Using join buffer
+EXPLAIN
+SELECT Name FROM City
+WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
+City.Population > 100000;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	PRIMARY	City	ALL	Population	NULL	NULL	NULL	4079	Using where
+2	DEPENDENT SUBQUERY	Country	unique_subquery	PRIMARY,Name	PRIMARY	3	func	1	Using where
+SELECT Name FROM City
+WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
+City.Population > 100000;
+Name
+Vientiane
+Riga
+Daugavpils
+Maseru
+Beirut
+Tripoli
+Monrovia
+Tripoli
+Bengasi
+Misrata
+Vilnius
+Kaunas
+Klaipeda
+?iauliai
+Panevezys
+EXPLAIN
+SELECT Country.Name, IF(ISNULL(CountryLanguage.Country), NULL, CountryLanguage.Percentage)
+FROM Country LEFT JOIN CountryLanguage ON
+(CountryLanguage.Country=Country.Code AND Language='English')
+WHERE 
+Country.Population > 10000000;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	Country	ALL	NULL	NULL	NULL	NULL	239	Using where
+1	SIMPLE	CountryLanguage	eq_ref	PRIMARY	PRIMARY	33	world.Country.Code,const	1	Using where; Using join buffer
+SELECT Country.Name, IF(ISNULL(CountryLanguage.Country), NULL, CountryLanguage.Percentage)
+FROM Country LEFT JOIN CountryLanguage ON
+(CountryLanguage.Country=Country.Code AND Language='English')
+WHERE 
+Country.Population > 10000000;
+Name	IF(ISNULL(CountryLanguage.Country), NULL, CountryLanguage.Percentage)
+Australia	81.2
+United Kingdom	97.3
+Canada	60.4
+United States	86.2
+Zimbabwe	2.2
+Japan	0.1
+South Africa	8.5
+Malaysia	1.6
+Afghanistan	NULL
+Netherlands	NULL
+Algeria	NULL
+Angola	NULL
+Argentina	NULL
+Bangladesh	NULL
+Belgium	NULL
+Brazil	NULL
+Burkina Faso	NULL
+Chile	NULL
+Ecuador	NULL
+Egypt	NULL
+Spain	NULL
+Ethiopia	NULL
+Philippines	NULL
+Ghana	NULL
+Guatemala	NULL
+Indonesia	NULL
+India	NULL
+Iraq	NULL
+Iran	NULL
+Italy	NULL
+Yemen	NULL
+Yugoslavia	NULL
+Cambodia	NULL
+Cameroon	NULL
+Kazakstan	NULL
+Kenya	NULL
+China	NULL
+Colombia	NULL
+Congo, The Democratic Republic of the	NULL
+North Korea	NULL
+South Korea	NULL
+Greece	NULL
+Cuba	NULL
+Madagascar	NULL
+Malawi	NULL
+Mali	NULL
+Morocco	NULL
+Mexico	NULL
+Mozambique	NULL
+Myanmar	NULL
+Nepal	NULL
+Niger	NULL
+Nigeria	NULL
+Côte d?Ivoire	NULL
+Pakistan	NULL
+Peru	NULL
+Poland	NULL
+France	NULL
+Romania	NULL
+Germany	NULL
+Saudi Arabia	NULL
+Somalia	NULL
+Sri Lanka	NULL
+Sudan	NULL
+Syria	NULL
+Taiwan	NULL
+Tanzania	NULL
+Thailand	NULL
+Czech Republic	NULL
+Turkey	NULL
+Uganda	NULL
+Ukraine	NULL
+Hungary	NULL
+Uzbekistan	NULL
+Belarus	NULL
+Venezuela	NULL
+Russian Federation	NULL
+Vietnam	NULL
+set join_cache_level=7;
+show variables like 'join_cache_level';
+Variable_name	Value
+join_cache_level	7
+EXPLAIN
+SELECT City.Name, Country.Name FROM City,Country
+WHERE City.Country=Country.Code AND 
+Country.Name LIKE 'L%' AND City.Population > 100000;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	Country	range	PRIMARY,Name	Name	52	NULL	10	Using index condition; Using MRR
+1	SIMPLE	City	ref	Population,Country	Country	3	world.Country.Code	18	Using where; Using join buffer
+SELECT City.Name, Country.Name FROM City,Country
+WHERE City.Country=Country.Code AND 
+Country.Name LIKE 'L%' AND City.Population > 100000;
+Name	Name
+Vientiane	Laos
+Riga	Latvia
+Daugavpils	Latvia
+Maseru	Lesotho
+Beirut	Lebanon
+Tripoli	Lebanon
+Monrovia	Liberia
+Tripoli	Libyan Arab Jamahiriya
+Bengasi	Libyan Arab Jamahiriya
+Misrata	Libyan Arab Jamahiriya
+Vilnius	Lithuania
+Kaunas	Lithuania
+Klaipeda	Lithuania
+?iauliai	Lithuania
+Panevezys	Lithuania
+EXPLAIN
+SELECT City.Name, Country.Name, CountryLanguage.Language
+FROM City,Country,CountryLanguage
+WHERE City.Country=Country.Code AND
+CountryLanguage.Country=Country.Code AND
+City.Name LIKE 'L%' AND Country.Population > 3000000 AND
+CountryLanguage.Percentage > 50;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	CountryLanguage	ALL	PRIMARY,Percentage	NULL	NULL	NULL	984	Using where
+1	SIMPLE	Country	eq_ref	PRIMARY	PRIMARY	3	world.CountryLanguage.Country	1	Using where; Using join buffer
+1	SIMPLE	City	ref	Country	Country	3	world.Country.Code	18	Using index condition(BKA); Using where; Using join buffer
+SELECT City.Name, Country.Name, CountryLanguage.Language
+FROM City,Country,CountryLanguage
+WHERE City.Country=Country.Code AND
+CountryLanguage.Country=Country.Code AND
+City.Name LIKE 'L%' AND Country.Population > 3000000 AND
+CountryLanguage.Percentage > 50;
+Name	Name	Language
+Leiden	Netherlands	Dutch
+La Matanza	Argentina	Spanish
+Lomas de Zamora	Argentina	Spanish
+La Plata	Argentina	Spanish
+Lanús	Argentina	Spanish
+Las Heras	Argentina	Spanish
+La Rioja	Argentina	Spanish
+Liège	Belgium	Dutch
+La Paz	Bolivia	Spanish
+Londrina	Brazil	Portuguese
+Limeira	Brazil	Portuguese
+Lages	Brazil	Portuguese
+Luziânia	Brazil	Portuguese
+Lauro de Freitas	Brazil	Portuguese
+Linhares	Brazil	Portuguese
+London	United Kingdom	English
+Liverpool	United Kingdom	English
+Leeds	United Kingdom	English
+Leicester	United Kingdom	English
+Luton	United Kingdom	English
+Los Angeles	Chile	Spanish
+La Serena	Chile	Spanish
+La Romana	Dominican Republic	Spanish
+Loja	Ecuador	Spanish
+Luxor	Egypt	Arabic
+Las Palmas de Gran Canaria	Spain	Spanish
+L´Hospitalet de Llobregat	Spain	Spanish
+Leganés	Spain	Spanish
+León	Spain	Spanish
+Logroño	Spain	Spanish
+Lleida (Lérida)	Spain	Spanish
+Le-Cap-Haïtien	Haiti	Haiti Creole
+La Ceiba	Honduras	Spanish
+Livorno	Italy	Italian
+Latina	Italy	Italian
+Lecce	Italy	Italian
+La Spezia	Italy	Italian
+Linz	Austria	German
+London	Canada	English
+Laval	Canada	English
+Longueuil	Canada	English
+Lanzhou	China	Chinese
+Luoyang	China	Chinese
+Liuzhou	China	Chinese
+Liaoyang	China	Chinese
+Liupanshui	China	Chinese
+Liaoyuan	China	Chinese
+Lianyungang	China	Chinese
+Leshan	China	Chinese
+Linyi	China	Chinese
+Luzhou	China	Chinese
+Laiwu	China	Chinese
+Liaocheng	China	Chinese
+Laizhou	China	Chinese
+Linfen	China	Chinese
+Liangcheng	China	Chinese
+Longkou	China	Chinese
+Langfang	China	Chinese
+Liu´an	China	Chinese
+Longjing	China	Chinese
+Lengshuijiang	China	Chinese
+Laiyang	China	Chinese
+Longyan	China	Chinese
+Linhe	China	Chinese
+Leiyang	China	Chinese
+Loudi	China	Chinese
+Luohe	China	Chinese
+Linqing	China	Chinese
+Laohekou	China	Chinese
+Linchuan	China	Chinese
+Lhasa	China	Chinese
+Lianyuan	China	Chinese
+Liyang	China	Chinese
+Liling	China	Chinese
+Linhai	China	Chinese
+Larisa	Greece	Greek
+La Habana	Cuba	Spanish
+Lilongwe	Malawi	Chichewa
+León	Mexico	Spanish
+La Paz	Mexico	Spanish
+La Paz	Mexico	Spanish
+Lázaro Cárdenas	Mexico	Spanish
+Lagos de Moreno	Mexico	Spanish
+Lerdo	Mexico	Spanish
+Los Cabos	Mexico	Spanish
+Lerma	Mexico	Spanish
+Las Margaritas	Mexico	Spanish
+Lashio (Lasho)	Myanmar	Burmese
+Lalitapur	Nepal	Nepali
+León	Nicaragua	Spanish
+Lambaré	Paraguay	Spanish
+Lima	Peru	Spanish
+Lisboa	Portugal	Portuguese
+Lódz	Poland	Polish
+Lublin	Poland	Polish
+Legnica	Poland	Polish
+Lyon	France	French
+Le Havre	France	French
+Lille	France	French
+Le Mans	France	French
+Limoges	France	French
+Linköping	Sweden	Swedish
+Lund	Sweden	Swedish
+Leipzig	Germany	German
+Lübeck	Germany	German
+Ludwigshafen am Rhein	Germany	German
+Leverkusen	Germany	German
+Lünen	Germany	German
+Lahti	Finland	Finnish
+Lausanne	Switzerland	German
+Latakia	Syria	Arabic
+Luchou	Taiwan	Min
+Lungtan	Taiwan	Min
+Liberec	Czech Republic	Czech
+Lviv	Ukraine	Ukrainian
+Lugansk	Ukraine	Ukrainian
+Lutsk	Ukraine	Ukrainian
+Lysyt?ansk	Ukraine	Ukrainian
+Lower Hutt	New Zealand	English
+Lida	Belarus	Belorussian
+Los Teques	Venezuela	Spanish
+Lipetsk	Russian Federation	Russian
+Ljubertsy	Russian Federation	Russian
+Leninsk-Kuznetski	Russian Federation	Russian
+Long Xuyen	Vietnam	Vietnamese
+Los Angeles	United States	English
+Las Vegas	United States	English
+Long Beach	United States	English
+Lexington-Fayette	United States	English
+Louisville	United States	English
+Lincoln	United States	English
+Lubbock	United States	English
+Little Rock	United States	English
+Laredo	United States	English
+Lakewood	United States	English
+Lansing	United States	English
+Lancaster	United States	English
+Lafayette	United States	English
+Lowell	United States	English
+Livonia	United States	English
+# !!!NB igor: after backporting the SJ code the following should return
+# EXPLAIN
+# SELECT Name FROM City
+# WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
+# City.Population > 100000;
+# id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+# 1	PRIMARY	Country	range	PRIMARY,Name	Name	52	NULL	10	Using index condition; Using MRR
+# 1	PRIMARY	City	ref	Population,Country	Country	3	world.Country.Code	18	Using where; Using join buffer
+EXPLAIN
+SELECT Name FROM City
+WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
+City.Population > 100000;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	PRIMARY	City	ALL	Population	NULL	NULL	NULL	4079	Using where
+2	DEPENDENT SUBQUERY	Country	unique_subquery	PRIMARY,Name	PRIMARY	3	func	1	Using where
+SELECT Name FROM City
+WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
+City.Population > 100000;
+Name
+Vientiane
+Riga
+Daugavpils
+Maseru
+Beirut
+Tripoli
+Monrovia
+Tripoli
+Bengasi
+Misrata
+Vilnius
+Kaunas
+Klaipeda
+?iauliai
+Panevezys
+EXPLAIN
+SELECT Country.Name, IF(ISNULL(CountryLanguage.Country), NULL, CountryLanguage.Percentage)
+FROM Country LEFT JOIN CountryLanguage ON
+(CountryLanguage.Country=Country.Code AND Language='English')
+WHERE 
+Country.Population > 10000000;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	Country	ALL	NULL	NULL	NULL	NULL	239	Using where
+1	SIMPLE	CountryLanguage	eq_ref	PRIMARY	PRIMARY	33	world.Country.Code,const	1	Using where; Using join buffer
+SELECT Country.Name, IF(ISNULL(CountryLanguage.Country), NULL, CountryLanguage.Percentage)
+FROM Country LEFT JOIN CountryLanguage ON
+(CountryLanguage.Country=Country.Code AND Language='English')
+WHERE 
+Country.Population > 10000000;
+Name	IF(ISNULL(CountryLanguage.Country), NULL, CountryLanguage.Percentage)
+Australia	81.2
+United Kingdom	97.3
+Canada	60.4
+United States	86.2
+Zimbabwe	2.2
+Japan	0.1
+South Africa	8.5
+Malaysia	1.6
+Afghanistan	NULL
+Netherlands	NULL
+Algeria	NULL
+Angola	NULL
+Argentina	NULL
+Bangladesh	NULL
+Belgium	NULL
+Brazil	NULL
+Burkina Faso	NULL
+Chile	NULL
+Ecuador	NULL
+Egypt	NULL
+Spain	NULL
+Ethiopia	NULL
+Philippines	NULL
+Ghana	NULL
+Guatemala	NULL
+Indonesia	NULL
+India	NULL
+Iraq	NULL
+Iran	NULL
+Italy	NULL
+Yemen	NULL
+Yugoslavia	NULL
+Cambodia	NULL
+Cameroon	NULL
+Kazakstan	NULL
+Kenya	NULL
+China	NULL
+Colombia	NULL
+Congo, The Democratic Republic of the	NULL
+North Korea	NULL
+South Korea	NULL
+Greece	NULL
+Cuba	NULL
+Madagascar	NULL
+Malawi	NULL
+Mali	NULL
+Morocco	NULL
+Mexico	NULL
+Mozambique	NULL
+Myanmar	NULL
+Nepal	NULL
+Niger	NULL
+Nigeria	NULL
+Côte d?Ivoire	NULL
+Pakistan	NULL
+Peru	NULL
+Poland	NULL
+France	NULL
+Romania	NULL
+Germany	NULL
+Saudi Arabia	NULL
+Somalia	NULL
+Sri Lanka	NULL
+Sudan	NULL
+Syria	NULL
+Taiwan	NULL
+Tanzania	NULL
+Thailand	NULL
+Czech Republic	NULL
+Turkey	NULL
+Uganda	NULL
+Ukraine	NULL
+Hungary	NULL
+Uzbekistan	NULL
+Belarus	NULL
+Venezuela	NULL
+Russian Federation	NULL
+Vietnam	NULL
+set join_cache_level=8;
+show variables like 'join_cache_level';
+Variable_name	Value
+join_cache_level	8
+EXPLAIN
+SELECT City.Name, Country.Name FROM City,Country
+WHERE City.Country=Country.Code AND 
+Country.Name LIKE 'L%' AND City.Population > 100000;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	Country	range	PRIMARY,Name	Name	52	NULL	10	Using index condition; Using MRR
+1	SIMPLE	City	ref	Population,Country	Country	3	world.Country.Code	18	Using where; Using join buffer
+SELECT City.Name, Country.Name FROM City,Country
+WHERE City.Country=Country.Code AND 
+Country.Name LIKE 'L%' AND City.Population > 100000;
+Name	Name
+Vientiane	Laos
+Riga	Latvia
+Daugavpils	Latvia
+Maseru	Lesotho
+Beirut	Lebanon
+Tripoli	Lebanon
+Monrovia	Liberia
+Tripoli	Libyan Arab Jamahiriya
+Bengasi	Libyan Arab Jamahiriya
+Misrata	Libyan Arab Jamahiriya
+Vilnius	Lithuania
+Kaunas	Lithuania
+Klaipeda	Lithuania
+?iauliai	Lithuania
+Panevezys	Lithuania
+EXPLAIN
+SELECT City.Name, Country.Name, CountryLanguage.Language
+FROM City,Country,CountryLanguage
+WHERE City.Country=Country.Code AND
+CountryLanguage.Country=Country.Code AND
+City.Name LIKE 'L%' AND Country.Population > 3000000 AND
+CountryLanguage.Percentage > 50;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	CountryLanguage	ALL	PRIMARY,Percentage	NULL	NULL	NULL	984	Using where
+1	SIMPLE	Country	eq_ref	PRIMARY	PRIMARY	3	world.CountryLanguage.Country	1	Using where; Using join buffer
+1	SIMPLE	City	ref	Country	Country	3	world.Country.Code	18	Using index condition(BKA); Using where; Using join buffer
+SELECT City.Name, Country.Name, CountryLanguage.Language
+FROM City,Country,CountryLanguage
+WHERE City.Country=Country.Code AND
+CountryLanguage.Country=Country.Code AND
+City.Name LIKE 'L%' AND Country.Population > 3000000 AND
+CountryLanguage.Percentage > 50;
+Name	Name	Language
+Leiden	Netherlands	Dutch
+La Matanza	Argentina	Spanish
+Lomas de Zamora	Argentina	Spanish
+La Plata	Argentina	Spanish
+Lanús	Argentina	Spanish
+Las Heras	Argentina	Spanish
+La Rioja	Argentina	Spanish
+Liège	Belgium	Dutch
+La Paz	Bolivia	Spanish
+Londrina	Brazil	Portuguese
+Limeira	Brazil	Portuguese
+Lages	Brazil	Portuguese
+Luziânia	Brazil	Portuguese
+Lauro de Freitas	Brazil	Portuguese
+Linhares	Brazil	Portuguese
+London	United Kingdom	English
+Liverpool	United Kingdom	English
+Leeds	United Kingdom	English
+Leicester	United Kingdom	English
+Luton	United Kingdom	English
+Los Angeles	Chile	Spanish
+La Serena	Chile	Spanish
+La Romana	Dominican Republic	Spanish
+Loja	Ecuador	Spanish
+Luxor	Egypt	Arabic
+Las Palmas de Gran Canaria	Spain	Spanish
+L´Hospitalet de Llobregat	Spain	Spanish
+Leganés	Spain	Spanish
+León	Spain	Spanish
+Logroño	Spain	Spanish
+Lleida (Lérida)	Spain	Spanish
+Le-Cap-Haïtien	Haiti	Haiti Creole
+La Ceiba	Honduras	Spanish
+Livorno	Italy	Italian
+Latina	Italy	Italian
+Lecce	Italy	Italian
+La Spezia	Italy	Italian
+Linz	Austria	German
+London	Canada	English
+Laval	Canada	English
+Longueuil	Canada	English
+Lanzhou	China	Chinese
+Luoyang	China	Chinese
+Liuzhou	China	Chinese
+Liaoyang	China	Chinese
+Liupanshui	China	Chinese
+Liaoyuan	China	Chinese
+Lianyungang	China	Chinese
+Leshan	China	Chinese
+Linyi	China	Chinese
+Luzhou	China	Chinese
+Laiwu	China	Chinese
+Liaocheng	China	Chinese
+Laizhou	China	Chinese
+Linfen	China	Chinese
+Liangcheng	China	Chinese
+Longkou	China	Chinese
+Langfang	China	Chinese
+Liu´an	China	Chinese
+Longjing	China	Chinese
+Lengshuijiang	China	Chinese
+Laiyang	China	Chinese
+Longyan	China	Chinese
+Linhe	China	Chinese
+Leiyang	China	Chinese
+Loudi	China	Chinese
+Luohe	China	Chinese
+Linqing	China	Chinese
+Laohekou	China	Chinese
+Linchuan	China	Chinese
+Lhasa	China	Chinese
+Lianyuan	China	Chinese
+Liyang	China	Chinese
+Liling	China	Chinese
+Linhai	China	Chinese
+Larisa	Greece	Greek
+La Habana	Cuba	Spanish
+Lilongwe	Malawi	Chichewa
+León	Mexico	Spanish
+La Paz	Mexico	Spanish
+La Paz	Mexico	Spanish
+Lázaro Cárdenas	Mexico	Spanish
+Lagos de Moreno	Mexico	Spanish
+Lerdo	Mexico	Spanish
+Los Cabos	Mexico	Spanish
+Lerma	Mexico	Spanish
+Las Margaritas	Mexico	Spanish
+Lashio (Lasho)	Myanmar	Burmese
+Lalitapur	Nepal	Nepali
+León	Nicaragua	Spanish
+Lambaré	Paraguay	Spanish
+Lima	Peru	Spanish
+Lisboa	Portugal	Portuguese
+Lódz	Poland	Polish
+Lublin	Poland	Polish
+Legnica	Poland	Polish
+Lyon	France	French
+Le Havre	France	French
+Lille	France	French
+Le Mans	France	French
+Limoges	France	French
+Linköping	Sweden	Swedish
+Lund	Sweden	Swedish
+Leipzig	Germany	German
+Lübeck	Germany	German
+Ludwigshafen am Rhein	Germany	German
+Leverkusen	Germany	German
+Lünen	Germany	German
+Lahti	Finland	Finnish
+Lausanne	Switzerland	German
+Latakia	Syria	Arabic
+Luchou	Taiwan	Min
+Lungtan	Taiwan	Min
+Liberec	Czech Republic	Czech
+Lviv	Ukraine	Ukrainian
+Lugansk	Ukraine	Ukrainian
+Lutsk	Ukraine	Ukrainian
+Lysyt?ansk	Ukraine	Ukrainian
+Lower Hutt	New Zealand	English
+Lida	Belarus	Belorussian
+Los Teques	Venezuela	Spanish
+Lipetsk	Russian Federation	Russian
+Ljubertsy	Russian Federation	Russian
+Leninsk-Kuznetski	Russian Federation	Russian
+Long Xuyen	Vietnam	Vietnamese
+Los Angeles	United States	English
+Las Vegas	United States	English
+Long Beach	United States	English
+Lexington-Fayette	United States	English
+Louisville	United States	English
+Lincoln	United States	English
+Lubbock	United States	English
+Little Rock	United States	English
+Laredo	United States	English
+Lakewood	United States	English
+Lansing	United States	English
+Lancaster	United States	English
+Lafayette	United States	English
+Lowell	United States	English
+Livonia	United States	English
+# !!!NB igor: after backporting the SJ code the following should return
+# EXPLAIN
+# SELECT Name FROM City
+# WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
+# City.Population > 100000;
+# id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+# 1	PRIMARY	Country	range	PRIMARY,Name	Name	52	NULL	10	Using index condition; Using MRR
+# 1	PRIMARY	City	ref	Population,Country	Country	3	world.Country.Code	18	Using where; Using join buffer
+EXPLAIN
+SELECT Name FROM City
+WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
+City.Population > 100000;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	PRIMARY	City	ALL	Population	NULL	NULL	NULL	4079	Using where
+2	DEPENDENT SUBQUERY	Country	unique_subquery	PRIMARY,Name	PRIMARY	3	func	1	Using where
+SELECT Name FROM City
+WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
+City.Population > 100000;
+Name
+Vientiane
+Riga
+Daugavpils
+Maseru
+Beirut
+Tripoli
+Monrovia
+Tripoli
+Bengasi
+Misrata
+Vilnius
+Kaunas
+Klaipeda
+?iauliai
+Panevezys
+EXPLAIN
+SELECT Country.Name, IF(ISNULL(CountryLanguage.Country), NULL, CountryLanguage.Percentage)
+FROM Country LEFT JOIN CountryLanguage ON
+(CountryLanguage.Country=Country.Code AND Language='English')
+WHERE 
+Country.Population > 10000000;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	Country	ALL	NULL	NULL	NULL	NULL	239	Using where
+1	SIMPLE	CountryLanguage	eq_ref	PRIMARY	PRIMARY	33	world.Country.Code,const	1	Using where; Using join buffer
+SELECT Country.Name, IF(ISNULL(CountryLanguage.Country), NULL, CountryLanguage.Percentage)
+FROM Country LEFT JOIN CountryLanguage ON
+(CountryLanguage.Country=Country.Code AND Language='English')
+WHERE 
+Country.Population > 10000000;
+Name	IF(ISNULL(CountryLanguage.Country), NULL, CountryLanguage.Percentage)
+Australia	81.2
+United Kingdom	97.3
+Canada	60.4
+United States	86.2
+Zimbabwe	2.2
+Japan	0.1
+South Africa	8.5
+Malaysia	1.6
+Afghanistan	NULL
+Netherlands	NULL
+Algeria	NULL
+Angola	NULL
+Argentina	NULL
+Bangladesh	NULL
+Belgium	NULL
+Brazil	NULL
+Burkina Faso	NULL
+Chile	NULL
+Ecuador	NULL
+Egypt	NULL
+Spain	NULL
+Ethiopia	NULL
+Philippines	NULL
+Ghana	NULL
+Guatemala	NULL
+Indonesia	NULL
+India	NULL
+Iraq	NULL
+Iran	NULL
+Italy	NULL
+Yemen	NULL
+Yugoslavia	NULL
+Cambodia	NULL
+Cameroon	NULL
+Kazakstan	NULL
+Kenya	NULL
+China	NULL
+Colombia	NULL
+Congo, The Democratic Republic of the	NULL
+North Korea	NULL
+South Korea	NULL
+Greece	NULL
+Cuba	NULL
+Madagascar	NULL
+Malawi	NULL
+Mali	NULL
+Morocco	NULL
+Mexico	NULL
+Mozambique	NULL
+Myanmar	NULL
+Nepal	NULL
+Niger	NULL
+Nigeria	NULL
+Côte d?Ivoire	NULL
+Pakistan	NULL
+Peru	NULL
+Poland	NULL
+France	NULL
+Romania	NULL
+Germany	NULL
+Saudi Arabia	NULL
+Somalia	NULL
+Sri Lanka	NULL
+Sudan	NULL
+Syria	NULL
+Taiwan	NULL
+Tanzania	NULL
+Thailand	NULL
+Czech Republic	NULL
+Turkey	NULL
+Uganda	NULL
+Ukraine	NULL
+Hungary	NULL
+Uzbekistan	NULL
+Belarus	NULL
+Venezuela	NULL
+Russian Federation	NULL
+Vietnam	NULL
+set join_buffer_size=256;
+show variables like 'join_buffer_size';
+Variable_name	Value
+join_buffer_size	256
+set join_cache_level=5;
+show variables like 'join_cache_level';
+Variable_name	Value
+join_cache_level	5
+EXPLAIN
+SELECT City.Name, Country.Name FROM City,Country
+WHERE City.Country=Country.Code AND 
+Country.Name LIKE 'L%' AND City.Population > 100000;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	Country	range	PRIMARY,Name	Name	52	NULL	10	Using index condition; Using MRR
+1	SIMPLE	City	ref	Population,Country	Country	3	world.Country.Code	18	Using where; Using join buffer
+SELECT City.Name, Country.Name FROM City,Country
+WHERE City.Country=Country.Code AND 
+Country.Name LIKE 'L%' AND City.Population > 100000;
+Name	Name
+Vientiane	Laos
+Riga	Latvia
+Daugavpils	Latvia
+Maseru	Lesotho
+Beirut	Lebanon
+Tripoli	Lebanon
+Monrovia	Liberia
+Tripoli	Libyan Arab Jamahiriya
+Bengasi	Libyan Arab Jamahiriya
+Misrata	Libyan Arab Jamahiriya
+Vilnius	Lithuania
+Kaunas	Lithuania
+Klaipeda	Lithuania
+?iauliai	Lithuania
+Panevezys	Lithuania
+EXPLAIN
+SELECT City.Name, Country.Name, CountryLanguage.Language
+FROM City,Country,CountryLanguage
+WHERE City.Country=Country.Code AND
+CountryLanguage.Country=Country.Code AND
+City.Name LIKE 'L%' AND Country.Population > 3000000 AND
+CountryLanguage.Percentage > 50;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	CountryLanguage	ALL	PRIMARY,Percentage	NULL	NULL	NULL	984	Using where
+1	SIMPLE	Country	eq_ref	PRIMARY	PRIMARY	3	world.CountryLanguage.Country	1	Using where; Using join buffer
+1	SIMPLE	City	ref	Country	Country	3	world.Country.Code	18	Using index condition(BKA); Using where; Using join buffer
+SELECT City.Name, Country.Name, CountryLanguage.Language
+FROM City,Country,CountryLanguage
+WHERE City.Country=Country.Code AND
+CountryLanguage.Country=Country.Code AND
+City.Name LIKE 'L%' AND Country.Population > 3000000 AND
+CountryLanguage.Percentage > 50;
+Name	Name	Language
+Leiden	Netherlands	Dutch
+La Matanza	Argentina	Spanish
+Lomas de Zamora	Argentina	Spanish
+La Plata	Argentina	Spanish
+Lanús	Argentina	Spanish
+Las Heras	Argentina	Spanish
+La Rioja	Argentina	Spanish
+Liège	Belgium	Dutch
+La Paz	Bolivia	Spanish
+Londrina	Brazil	Portuguese
+Limeira	Brazil	Portuguese
+Lages	Brazil	Portuguese
+Luziânia	Brazil	Portuguese
+Lauro de Freitas	Brazil	Portuguese
+Linhares	Brazil	Portuguese
+London	United Kingdom	English
+Liverpool	United Kingdom	English
+Leeds	United Kingdom	English
+Leicester	United Kingdom	English
+Luton	United Kingdom	English
+Los Angeles	Chile	Spanish
+La Serena	Chile	Spanish
+La Romana	Dominican Republic	Spanish
+Loja	Ecuador	Spanish
+Luxor	Egypt	Arabic
+Las Palmas de Gran Canaria	Spain	Spanish
+L´Hospitalet de Llobregat	Spain	Spanish
+Leganés	Spain	Spanish
+León	Spain	Spanish
+Logroño	Spain	Spanish
+Lleida (Lérida)	Spain	Spanish
+Le-Cap-Haïtien	Haiti	Haiti Creole
+La Ceiba	Honduras	Spanish
+Livorno	Italy	Italian
+Latina	Italy	Italian
+Lecce	Italy	Italian
+La Spezia	Italy	Italian
+Linz	Austria	German
+London	Canada	English
+Laval	Canada	English
+Longueuil	Canada	English
+Lanzhou	China	Chinese
+Luoyang	China	Chinese
+Liuzhou	China	Chinese
+Liaoyang	China	Chinese
+Liupanshui	China	Chinese
+Liaoyuan	China	Chinese
+Lianyungang	China	Chinese
+Leshan	China	Chinese
+Linyi	China	Chinese
+Luzhou	China	Chinese
+Laiwu	China	Chinese
+Liaocheng	China	Chinese
+Laizhou	China	Chinese
+Linfen	China	Chinese
+Liangcheng	China	Chinese
+Longkou	China	Chinese
+Langfang	China	Chinese
+Liu´an	China	Chinese
+Longjing	China	Chinese
+Lengshuijiang	China	Chinese
+Laiyang	China	Chinese
+Longyan	China	Chinese
+Linhe	China	Chinese
+Leiyang	China	Chinese
+Loudi	China	Chinese
+Luohe	China	Chinese
+Linqing	China	Chinese
+Laohekou	China	Chinese
+Linchuan	China	Chinese
+Lhasa	China	Chinese
+Lianyuan	China	Chinese
+Liyang	China	Chinese
+Liling	China	Chinese
+Linhai	China	Chinese
+Larisa	Greece	Greek
+La Habana	Cuba	Spanish
+Lilongwe	Malawi	Chichewa
+León	Mexico	Spanish
+La Paz	Mexico	Spanish
+La Paz	Mexico	Spanish
+Lázaro Cárdenas	Mexico	Spanish
+Lagos de Moreno	Mexico	Spanish
+Lerdo	Mexico	Spanish
+Los Cabos	Mexico	Spanish
+Lerma	Mexico	Spanish
+Las Margaritas	Mexico	Spanish
+Lashio (Lasho)	Myanmar	Burmese
+Lalitapur	Nepal	Nepali
+León	Nicaragua	Spanish
+Lambaré	Paraguay	Spanish
+Lima	Peru	Spanish
+Lisboa	Portugal	Portuguese
+Lódz	Poland	Polish
+Lublin	Poland	Polish
+Legnica	Poland	Polish
+Lyon	France	French
+Le Havre	France	French
+Lille	France	French
+Le Mans	France	French
+Limoges	France	French
+Linköping	Sweden	Swedish
+Lund	Sweden	Swedish
+Leipzig	Germany	German
+Lübeck	Germany	German
+Ludwigshafen am Rhein	Germany	German
+Leverkusen	Germany	German
+Lünen	Germany	German
+Lahti	Finland	Finnish
+Lausanne	Switzerland	German
+Latakia	Syria	Arabic
+Luchou	Taiwan	Min
+Lungtan	Taiwan	Min
+Liberec	Czech Republic	Czech
+Lviv	Ukraine	Ukrainian
+Lugansk	Ukraine	Ukrainian
+Lutsk	Ukraine	Ukrainian
+Lysyt?ansk	Ukraine	Ukrainian
+Lower Hutt	New Zealand	English
+Lida	Belarus	Belorussian
+Los Teques	Venezuela	Spanish
+Lipetsk	Russian Federation	Russian
+Ljubertsy	Russian Federation	Russian
+Leninsk-Kuznetski	Russian Federation	Russian
+Long Xuyen	Vietnam	Vietnamese
+Los Angeles	United States	English
+Las Vegas	United States	English
+Long Beach	United States	English
+Lexington-Fayette	United States	English
+Louisville	United States	English
+Lincoln	United States	English
+Lubbock	United States	English
+Little Rock	United States	English
+Laredo	United States	English
+Lakewood	United States	English
+Lansing	United States	English
+Lancaster	United States	English
+Lafayette	United States	English
+Lowell	United States	English
+Livonia	United States	English
+# !!!NB igor: after backporting the SJ code the following should return
+# EXPLAIN
+# SELECT Name FROM City
+# WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
+# City.Population > 100000;
+# id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+# 1	PRIMARY	Country	range	PRIMARY,Name	Name	52	NULL	10	Using index condition; Using MRR
+# 1	PRIMARY	City	ref	Population,Country	Country	3	world.Country.Code	18	Using where; Using join buffer
+EXPLAIN
+SELECT Name FROM City
+WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
+City.Population > 100000;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	PRIMARY	City	ALL	Population	NULL	NULL	NULL	4079	Using where
+2	DEPENDENT SUBQUERY	Country	unique_subquery	PRIMARY,Name	PRIMARY	3	func	1	Using where
+SELECT Name FROM City
+WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
+City.Population > 100000;
+Name
+Vientiane
+Riga
+Daugavpils
+Maseru
+Beirut
+Tripoli
+Monrovia
+Tripoli
+Bengasi
+Misrata
+Vilnius
+Kaunas
+Klaipeda
+?iauliai
+Panevezys
+set join_cache_level=6;
+show variables like 'join_cache_level';
+Variable_name	Value
+join_cache_level	6
+EXPLAIN
+SELECT City.Name, Country.Name FROM City,Country
+WHERE City.Country=Country.Code AND 
+Country.Name LIKE 'L%' AND City.Population > 100000;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	Country	range	PRIMARY,Name	Name	52	NULL	10	Using index condition; Using MRR
+1	SIMPLE	City	ref	Population,Country	Country	3	world.Country.Code	18	Using where; Using join buffer
+SELECT City.Name, Country.Name FROM City,Country
+WHERE City.Country=Country.Code AND 
+Country.Name LIKE 'L%' AND City.Population > 100000;
+Name	Name
+Vientiane	Laos
+Riga	Latvia
+Daugavpils	Latvia
+Maseru	Lesotho
+Beirut	Lebanon
+Tripoli	Lebanon
+Monrovia	Liberia
+Tripoli	Libyan Arab Jamahiriya
+Bengasi	Libyan Arab Jamahiriya
+Misrata	Libyan Arab Jamahiriya
+Vilnius	Lithuania
+Kaunas	Lithuania
+Klaipeda	Lithuania
+?iauliai	Lithuania
+Panevezys	Lithuania
+EXPLAIN
+SELECT City.Name, Country.Name, CountryLanguage.Language
+FROM City,Country,CountryLanguage
+WHERE City.Country=Country.Code AND
+CountryLanguage.Country=Country.Code AND
+City.Name LIKE 'L%' AND Country.Population > 3000000 AND
+CountryLanguage.Percentage > 50;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	CountryLanguage	ALL	PRIMARY,Percentage	NULL	NULL	NULL	984	Using where
+1	SIMPLE	Country	eq_ref	PRIMARY	PRIMARY	3	world.CountryLanguage.Country	1	Using where; Using join buffer
+1	SIMPLE	City	ref	Country	Country	3	world.Country.Code	18	Using index condition(BKA); Using where; Using join buffer
+SELECT City.Name, Country.Name, CountryLanguage.Language
+FROM City,Country,CountryLanguage
+WHERE City.Country=Country.Code AND
+CountryLanguage.Country=Country.Code AND
+City.Name LIKE 'L%' AND Country.Population > 3000000 AND
+CountryLanguage.Percentage > 50;
+Name	Name	Language
+Leiden	Netherlands	Dutch
+La Matanza	Argentina	Spanish
+Lomas de Zamora	Argentina	Spanish
+La Plata	Argentina	Spanish
+Lanús	Argentina	Spanish
+Las Heras	Argentina	Spanish
+La Rioja	Argentina	Spanish
+Liège	Belgium	Dutch
+La Paz	Bolivia	Spanish
+Londrina	Brazil	Portuguese
+Limeira	Brazil	Portuguese
+Lages	Brazil	Portuguese
+Luziânia	Brazil	Portuguese
+Lauro de Freitas	Brazil	Portuguese
+Linhares	Brazil	Portuguese
+London	United Kingdom	English
+Liverpool	United Kingdom	English
+Leeds	United Kingdom	English
+Leicester	United Kingdom	English
+Luton	United Kingdom	English
+Los Angeles	Chile	Spanish
+La Serena	Chile	Spanish
+La Romana	Dominican Republic	Spanish
+Loja	Ecuador	Spanish
+Luxor	Egypt	Arabic
+Las Palmas de Gran Canaria	Spain	Spanish
+L´Hospitalet de Llobregat	Spain	Spanish
+Leganés	Spain	Spanish
+León	Spain	Spanish
+Logroño	Spain	Spanish
+Lleida (Lérida)	Spain	Spanish
+Le-Cap-Haïtien	Haiti	Haiti Creole
+La Ceiba	Honduras	Spanish
+Livorno	Italy	Italian
+Latina	Italy	Italian
+Lecce	Italy	Italian
+La Spezia	Italy	Italian
+Linz	Austria	German
+London	Canada	English
+Laval	Canada	English
+Longueuil	Canada	English
+Lanzhou	China	Chinese
+Luoyang	China	Chinese
+Liuzhou	China	Chinese
+Liaoyang	China	Chinese
+Liupanshui	China	Chinese
+Liaoyuan	China	Chinese
+Lianyungang	China	Chinese
+Leshan	China	Chinese
+Linyi	China	Chinese
+Luzhou	China	Chinese
+Laiwu	China	Chinese
+Liaocheng	China	Chinese
+Laizhou	China	Chinese
+Linfen	China	Chinese
+Liangcheng	China	Chinese
+Longkou	China	Chinese
+Langfang	China	Chinese
+Liu´an	China	Chinese
+Longjing	China	Chinese
+Lengshuijiang	China	Chinese
+Laiyang	China	Chinese
+Longyan	China	Chinese
+Linhe	China	Chinese
+Leiyang	China	Chinese
+Loudi	China	Chinese
+Luohe	China	Chinese
+Linqing	China	Chinese
+Laohekou	China	Chinese
+Linchuan	China	Chinese
+Lhasa	China	Chinese
+Lianyuan	China	Chinese
+Liyang	China	Chinese
+Liling	China	Chinese
+Linhai	China	Chinese
+Larisa	Greece	Greek
+La Habana	Cuba	Spanish
+Lilongwe	Malawi	Chichewa
+León	Mexico	Spanish
+La Paz	Mexico	Spanish
+La Paz	Mexico	Spanish
+Lázaro Cárdenas	Mexico	Spanish
+Lagos de Moreno	Mexico	Spanish
+Lerdo	Mexico	Spanish
+Los Cabos	Mexico	Spanish
+Lerma	Mexico	Spanish
+Las Margaritas	Mexico	Spanish
+Lashio (Lasho)	Myanmar	Burmese
+Lalitapur	Nepal	Nepali
+León	Nicaragua	Spanish
+Lambaré	Paraguay	Spanish
+Lima	Peru	Spanish
+Lisboa	Portugal	Portuguese
+Lódz	Poland	Polish
+Lublin	Poland	Polish
+Legnica	Poland	Polish
+Lyon	France	French
+Le Havre	France	French
+Lille	France	French
+Le Mans	France	French
+Limoges	France	French
+Linköping	Sweden	Swedish
+Lund	Sweden	Swedish
+Leipzig	Germany	German
+Lübeck	Germany	German
+Ludwigshafen am Rhein	Germany	German
+Leverkusen	Germany	German
+Lünen	Germany	German
+Lahti	Finland	Finnish
+Lausanne	Switzerland	German
+Latakia	Syria	Arabic
+Luchou	Taiwan	Min
+Lungtan	Taiwan	Min
+Liberec	Czech Republic	Czech
+Lviv	Ukraine	Ukrainian
+Lugansk	Ukraine	Ukrainian
+Lutsk	Ukraine	Ukrainian
+Lysyt?ansk	Ukraine	Ukrainian
+Lower Hutt	New Zealand	English
+Lida	Belarus	Belorussian
+Los Teques	Venezuela	Spanish
+Lipetsk	Russian Federation	Russian
+Ljubertsy	Russian Federation	Russian
+Leninsk-Kuznetski	Russian Federation	Russian
+Long Xuyen	Vietnam	Vietnamese
+Los Angeles	United States	English
+Las Vegas	United States	English
+Long Beach	United States	English
+Lexington-Fayette	United States	English
+Louisville	United States	English
+Lincoln	United States	English
+Lubbock	United States	English
+Little Rock	United States	English
+Laredo	United States	English
+Lakewood	United States	English
+Lansing	United States	English
+Lancaster	United States	English
+Lafayette	United States	English
+Lowell	United States	English
+Livonia	United States	English
+# !!!NB igor: after backporting the SJ code the following should return
+# EXPLAIN
+# SELECT Name FROM City
+# WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
+# City.Population > 100000;
+# id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+# 1	PRIMARY	Country	range	PRIMARY,Name	Name	52	NULL	10	Using index condition; Using MRR
+# 1	PRIMARY	City	ref	Population,Country	Country	3	world.Country.Code	18	Using where; Using join buffer
+EXPLAIN
+SELECT Name FROM City
+WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
+City.Population > 100000;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	PRIMARY	City	ALL	Population	NULL	NULL	NULL	4079	Using where
+2	DEPENDENT SUBQUERY	Country	unique_subquery	PRIMARY,Name	PRIMARY	3	func	1	Using where
+SELECT Name FROM City
+WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
+City.Population > 100000;
+Name
+Vientiane
+Riga
+Daugavpils
+Maseru
+Beirut
+Tripoli
+Monrovia
+Tripoli
+Bengasi
+Misrata
+Vilnius
+Kaunas
+Klaipeda
+?iauliai
+Panevezys
+set join_cache_level=7;
+show variables like 'join_cache_level';
+Variable_name	Value
+join_cache_level	7
+EXPLAIN
+SELECT City.Name, Country.Name FROM City,Country
+WHERE City.Country=Country.Code AND 
+Country.Name LIKE 'L%' AND City.Population > 100000;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	Country	range	PRIMARY,Name	Name	52	NULL	10	Using index condition; Using MRR
+1	SIMPLE	City	ref	Population,Country	Country	3	world.Country.Code	18	Using where; Using join buffer
+SELECT City.Name, Country.Name FROM City,Country
+WHERE City.Country=Country.Code AND 
+Country.Name LIKE 'L%' AND City.Population > 100000;
+Name	Name
+Vientiane	Laos
+Riga	Latvia
+Daugavpils	Latvia
+Maseru	Lesotho
+Beirut	Lebanon
+Tripoli	Lebanon
+Monrovia	Liberia
+Tripoli	Libyan Arab Jamahiriya
+Bengasi	Libyan Arab Jamahiriya
+Misrata	Libyan Arab Jamahiriya
+Vilnius	Lithuania
+Kaunas	Lithuania
+Klaipeda	Lithuania
+?iauliai	Lithuania
+Panevezys	Lithuania
+EXPLAIN
+SELECT City.Name, Country.Name, CountryLanguage.Language
+FROM City,Country,CountryLanguage
+WHERE City.Country=Country.Code AND
+CountryLanguage.Country=Country.Code AND
+City.Name LIKE 'L%' AND Country.Population > 3000000 AND
+CountryLanguage.Percentage > 50;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	CountryLanguage	ALL	PRIMARY,Percentage	NULL	NULL	NULL	984	Using where
+1	SIMPLE	Country	eq_ref	PRIMARY	PRIMARY	3	world.CountryLanguage.Country	1	Using where; Using join buffer
+1	SIMPLE	City	ref	Country	Country	3	world.Country.Code	18	Using index condition(BKA); Using where; Using join buffer
+SELECT City.Name, Country.Name, CountryLanguage.Language
+FROM City,Country,CountryLanguage
+WHERE City.Country=Country.Code AND
+CountryLanguage.Country=Country.Code AND
+City.Name LIKE 'L%' AND Country.Population > 3000000 AND
+CountryLanguage.Percentage > 50;
+Name	Name	Language
+Leiden	Netherlands	Dutch
+La Matanza	Argentina	Spanish
+Lomas de Zamora	Argentina	Spanish
+La Plata	Argentina	Spanish
+Lanús	Argentina	Spanish
+Las Heras	Argentina	Spanish
+La Rioja	Argentina	Spanish
+Liège	Belgium	Dutch
+La Paz	Bolivia	Spanish
+Londrina	Brazil	Portuguese
+Limeira	Brazil	Portuguese
+Lages	Brazil	Portuguese
+Luziânia	Brazil	Portuguese
+Lauro de Freitas	Brazil	Portuguese
+Linhares	Brazil	Portuguese
+London	United Kingdom	English
+Liverpool	United Kingdom	English
+Leeds	United Kingdom	English
+Leicester	United Kingdom	English
+Luton	United Kingdom	English
+Los Angeles	Chile	Spanish
+La Serena	Chile	Spanish
+La Romana	Dominican Republic	Spanish
+Loja	Ecuador	Spanish
+Luxor	Egypt	Arabic
+Las Palmas de Gran Canaria	Spain	Spanish
+L´Hospitalet de Llobregat	Spain	Spanish
+Leganés	Spain	Spanish
+León	Spain	Spanish
+Logroño	Spain	Spanish
+Lleida (Lérida)	Spain	Spanish
+Le-Cap-Haïtien	Haiti	Haiti Creole
+La Ceiba	Honduras	Spanish
+Livorno	Italy	Italian
+Latina	Italy	Italian
+Lecce	Italy	Italian
+La Spezia	Italy	Italian
+Linz	Austria	German
+London	Canada	English
+Laval	Canada	English
+Longueuil	Canada	English
+Lanzhou	China	Chinese
+Luoyang	China	Chinese
+Liuzhou	China	Chinese
+Liaoyang	China	Chinese
+Liupanshui	China	Chinese
+Liaoyuan	China	Chinese
+Lianyungang	China	Chinese
+Leshan	China	Chinese
+Linyi	China	Chinese
+Luzhou	China	Chinese
+Laiwu	China	Chinese
+Liaocheng	China	Chinese
+Laizhou	China	Chinese
+Linfen	China	Chinese
+Liangcheng	China	Chinese
+Longkou	China	Chinese
+Langfang	China	Chinese
+Liu´an	China	Chinese
+Longjing	China	Chinese
+Lengshuijiang	China	Chinese
+Laiyang	China	Chinese
+Longyan	China	Chinese
+Linhe	China	Chinese
+Leiyang	China	Chinese
+Loudi	China	Chinese
+Luohe	China	Chinese
+Linqing	China	Chinese
+Laohekou	China	Chinese
+Linchuan	China	Chinese
+Lhasa	China	Chinese
+Lianyuan	China	Chinese
+Liyang	China	Chinese
+Liling	China	Chinese
+Linhai	China	Chinese
+Larisa	Greece	Greek
+La Habana	Cuba	Spanish
+Lilongwe	Malawi	Chichewa
+León	Mexico	Spanish
+La Paz	Mexico	Spanish
+La Paz	Mexico	Spanish
+Lázaro Cárdenas	Mexico	Spanish
+Lagos de Moreno	Mexico	Spanish
+Lerdo	Mexico	Spanish
+Los Cabos	Mexico	Spanish
+Lerma	Mexico	Spanish
+Las Margaritas	Mexico	Spanish
+Lashio (Lasho)	Myanmar	Burmese
+Lalitapur	Nepal	Nepali
+León	Nicaragua	Spanish
+Lambaré	Paraguay	Spanish
+Lima	Peru	Spanish
+Lisboa	Portugal	Portuguese
+Lódz	Poland	Polish
+Lublin	Poland	Polish
+Legnica	Poland	Polish
+Lyon	France	French
+Le Havre	France	French
+Lille	France	French
+Le Mans	France	French
+Limoges	France	French
+Linköping	Sweden	Swedish
+Lund	Sweden	Swedish
+Leipzig	Germany	German
+Lübeck	Germany	German
+Ludwigshafen am Rhein	Germany	German
+Leverkusen	Germany	German
+Lünen	Germany	German
+Lahti	Finland	Finnish
+Lausanne	Switzerland	German
+Latakia	Syria	Arabic
+Luchou	Taiwan	Min
+Lungtan	Taiwan	Min
+Liberec	Czech Republic	Czech
+Lviv	Ukraine	Ukrainian
+Lugansk	Ukraine	Ukrainian
+Lutsk	Ukraine	Ukrainian
+Lysyt?ansk	Ukraine	Ukrainian
+Lower Hutt	New Zealand	English
+Lida	Belarus	Belorussian
+Los Teques	Venezuela	Spanish
+Lipetsk	Russian Federation	Russian
+Ljubertsy	Russian Federation	Russian
+Leninsk-Kuznetski	Russian Federation	Russian
+Long Xuyen	Vietnam	Vietnamese
+Los Angeles	United States	English
+Las Vegas	United States	English
+Long Beach	United States	English
+Lexington-Fayette	United States	English
+Louisville	United States	English
+Lincoln	United States	English
+Lubbock	United States	English
+Little Rock	United States	English
+Laredo	United States	English
+Lakewood	United States	English
+Lansing	United States	English
+Lancaster	United States	English
+Lafayette	United States	English
+Lowell	United States	English
+Livonia	United States	English
+# !!!NB igor: after backporting the SJ code the following should return
+# EXPLAIN
+# SELECT Name FROM City
+# WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
+# City.Population > 100000;
+# id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+# 1	PRIMARY	Country	range	PRIMARY,Name	Name	52	NULL	10	Using index condition; Using MRR
+# 1	PRIMARY	City	ref	Population,Country	Country	3	world.Country.Code	18	Using where; Using join buffer
+EXPLAIN
+SELECT Name FROM City
+WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
+City.Population > 100000;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	PRIMARY	City	ALL	Population	NULL	NULL	NULL	4079	Using where
+2	DEPENDENT SUBQUERY	Country	unique_subquery	PRIMARY,Name	PRIMARY	3	func	1	Using where
+SELECT Name FROM City
+WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
+City.Population > 100000;
+Name
+Vientiane
+Riga
+Daugavpils
+Maseru
+Beirut
+Tripoli
+Monrovia
+Tripoli
+Bengasi
+Misrata
+Vilnius
+Kaunas
+Klaipeda
+?iauliai
+Panevezys
+set join_cache_level=8;
+show variables like 'join_cache_level';
+Variable_name	Value
+join_cache_level	8
+EXPLAIN
+SELECT City.Name, Country.Name FROM City,Country
+WHERE City.Country=Country.Code AND 
+Country.Name LIKE 'L%' AND City.Population > 100000;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	Country	range	PRIMARY,Name	Name	52	NULL	10	Using index condition; Using MRR
+1	SIMPLE	City	ref	Population,Country	Country	3	world.Country.Code	18	Using where; Using join buffer
+SELECT City.Name, Country.Name FROM City,Country
+WHERE City.Country=Country.Code AND 
+Country.Name LIKE 'L%' AND City.Population > 100000;
+Name	Name
+Vientiane	Laos
+Riga	Latvia
+Daugavpils	Latvia
+Maseru	Lesotho
+Beirut	Lebanon
+Tripoli	Lebanon
+Monrovia	Liberia
+Tripoli	Libyan Arab Jamahiriya
+Bengasi	Libyan Arab Jamahiriya
+Misrata	Libyan Arab Jamahiriya
+Vilnius	Lithuania
+Kaunas	Lithuania
+Klaipeda	Lithuania
+?iauliai	Lithuania
+Panevezys	Lithuania
+EXPLAIN
+SELECT City.Name, Country.Name, CountryLanguage.Language
+FROM City,Country,CountryLanguage
+WHERE City.Country=Country.Code AND
+CountryLanguage.Country=Country.Code AND
+City.Name LIKE 'L%' AND Country.Population > 3000000 AND
+CountryLanguage.Percentage > 50;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	CountryLanguage	ALL	PRIMARY,Percentage	NULL	NULL	NULL	984	Using where
+1	SIMPLE	Country	eq_ref	PRIMARY	PRIMARY	3	world.CountryLanguage.Country	1	Using where; Using join buffer
+1	SIMPLE	City	ref	Country	Country	3	world.Country.Code	18	Using index condition(BKA); Using where; Using join buffer
+SELECT City.Name, Country.Name, CountryLanguage.Language
+FROM City,Country,CountryLanguage
+WHERE City.Country=Country.Code AND
+CountryLanguage.Country=Country.Code AND
+City.Name LIKE 'L%' AND Country.Population > 3000000 AND
+CountryLanguage.Percentage > 50;
+Name	Name	Language
+Leiden	Netherlands	Dutch
+La Matanza	Argentina	Spanish
+Lomas de Zamora	Argentina	Spanish
+La Plata	Argentina	Spanish
+Lanús	Argentina	Spanish
+Las Heras	Argentina	Spanish
+La Rioja	Argentina	Spanish
+Liège	Belgium	Dutch
+La Paz	Bolivia	Spanish
+Londrina	Brazil	Portuguese
+Limeira	Brazil	Portuguese
+Lages	Brazil	Portuguese
+Luziânia	Brazil	Portuguese
+Lauro de Freitas	Brazil	Portuguese
+Linhares	Brazil	Portuguese
+London	United Kingdom	English
+Liverpool	United Kingdom	English
+Leeds	United Kingdom	English
+Leicester	United Kingdom	English
+Luton	United Kingdom	English
+Los Angeles	Chile	Spanish
+La Serena	Chile	Spanish
+La Romana	Dominican Republic	Spanish
+Loja	Ecuador	Spanish
+Luxor	Egypt	Arabic
+Las Palmas de Gran Canaria	Spain	Spanish
+L´Hospitalet de Llobregat	Spain	Spanish
+Leganés	Spain	Spanish
+León	Spain	Spanish
+Logroño	Spain	Spanish
+Lleida (Lérida)	Spain	Spanish
+Le-Cap-Haïtien	Haiti	Haiti Creole
+La Ceiba	Honduras	Spanish
+Livorno	Italy	Italian
+Latina	Italy	Italian
+Lecce	Italy	Italian
+La Spezia	Italy	Italian
+Linz	Austria	German
+London	Canada	English
+Laval	Canada	English
+Longueuil	Canada	English
+Lanzhou	China	Chinese
+Luoyang	China	Chinese
+Liuzhou	China	Chinese
+Liaoyang	China	Chinese
+Liupanshui	China	Chinese
+Liaoyuan	China	Chinese
+Lianyungang	China	Chinese
+Leshan	China	Chinese
+Linyi	China	Chinese
+Luzhou	China	Chinese
+Laiwu	China	Chinese
+Liaocheng	China	Chinese
+Laizhou	China	Chinese
+Linfen	China	Chinese
+Liangcheng	China	Chinese
+Longkou	China	Chinese
+Langfang	China	Chinese
+Liu´an	China	Chinese
+Longjing	China	Chinese
+Lengshuijiang	China	Chinese
+Laiyang	China	Chinese
+Longyan	China	Chinese
+Linhe	China	Chinese
+Leiyang	China	Chinese
+Loudi	China	Chinese
+Luohe	China	Chinese
+Linqing	China	Chinese
+Laohekou	China	Chinese
+Linchuan	China	Chinese
+Lhasa	China	Chinese
+Lianyuan	China	Chinese
+Liyang	China	Chinese
+Liling	China	Chinese
+Linhai	China	Chinese
+Larisa	Greece	Greek
+La Habana	Cuba	Spanish
+Lilongwe	Malawi	Chichewa
+León	Mexico	Spanish
+La Paz	Mexico	Spanish
+La Paz	Mexico	Spanish
+Lázaro Cárdenas	Mexico	Spanish
+Lagos de Moreno	Mexico	Spanish
+Lerdo	Mexico	Spanish
+Los Cabos	Mexico	Spanish
+Lerma	Mexico	Spanish
+Las Margaritas	Mexico	Spanish
+Lashio (Lasho)	Myanmar	Burmese
+Lalitapur	Nepal	Nepali
+León	Nicaragua	Spanish
+Lambaré	Paraguay	Spanish
+Lima	Peru	Spanish
+Lisboa	Portugal	Portuguese
+Lódz	Poland	Polish
+Lublin	Poland	Polish
+Legnica	Poland	Polish
+Lyon	France	French
+Le Havre	France	French
+Lille	France	French
+Le Mans	France	French
+Limoges	France	French
+Linköping	Sweden	Swedish
+Lund	Sweden	Swedish
+Leipzig	Germany	German
+Lübeck	Germany	German
+Ludwigshafen am Rhein	Germany	German
+Leverkusen	Germany	German
+Lünen	Germany	German
+Lahti	Finland	Finnish
+Lausanne	Switzerland	German
+Latakia	Syria	Arabic
+Luchou	Taiwan	Min
+Lungtan	Taiwan	Min
+Liberec	Czech Republic	Czech
+Lviv	Ukraine	Ukrainian
+Lugansk	Ukraine	Ukrainian
+Lutsk	Ukraine	Ukrainian
+Lysyt?ansk	Ukraine	Ukrainian
+Lower Hutt	New Zealand	English
+Lida	Belarus	Belorussian
+Los Teques	Venezuela	Spanish
+Lipetsk	Russian Federation	Russian
+Ljubertsy	Russian Federation	Russian
+Leninsk-Kuznetski	Russian Federation	Russian
+Long Xuyen	Vietnam	Vietnamese
+Los Angeles	United States	English
+Las Vegas	United States	English
+Long Beach	United States	English
+Lexington-Fayette	United States	English
+Louisville	United States	English
+Lincoln	United States	English
+Lubbock	United States	English
+Little Rock	United States	English
+Laredo	United States	English
+Lakewood	United States	English
+Lansing	United States	English
+Lancaster	United States	English
+Lafayette	United States	English
+Lowell	United States	English
+Livonia	United States	English
+# !!!NB igor: after backporting the SJ code the following should return
+# EXPLAIN
+# SELECT Name FROM City
+# WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
+# City.Population > 100000;
+# id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+# 1	PRIMARY	Country	range	PRIMARY,Name	Name	52	NULL	10	Using index condition; Using MRR
+# 1	PRIMARY	City	ref	Population,Country	Country	3	world.Country.Code	18	Using where; Using join buffer
+EXPLAIN
+SELECT Name FROM City
+WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
+City.Population > 100000;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	PRIMARY	City	ALL	Population	NULL	NULL	NULL	4079	Using where
+2	DEPENDENT SUBQUERY	Country	unique_subquery	PRIMARY,Name	PRIMARY	3	func	1	Using where
+SELECT Name FROM City
+WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
+City.Population > 100000;
+Name
+Vientiane
+Riga
+Daugavpils
+Maseru
+Beirut
+Tripoli
+Monrovia
+Tripoli
+Bengasi
+Misrata
+Vilnius
+Kaunas
+Klaipeda
+?iauliai
+Panevezys
+set join_cache_level=default;
+set join_buffer_size=default;
+show variables like 'join_buffer_size';
+Variable_name	Value
+join_buffer_size	131072
+show variables like 'join_cache_level';
+Variable_name	Value
+join_cache_level	1
+set join_cache_level=1;
+SELECT City.Name, Country.Name FROM City,Country
+WHERE City.Country=Country.Code AND City.Population > 3000000;
+Name	Name
+Sydney	Australia
+Dhaka	Bangladesh
+São Paulo	Brazil
+Rio de Janeiro	Brazil
+London	United Kingdom
+Santiago de Chile	Chile
+Cairo	Egypt
+Alexandria	Egypt
+Jakarta	Indonesia
+Mumbai (Bombay)	India
+Delhi	India
+Calcutta [Kolkata]	India
+Chennai (Madras)	India
+Baghdad	Iraq
+Teheran	Iran
+Tokyo	Japan
+Jokohama [Yokohama]	Japan
+Shanghai	China
+Peking	China
+Chongqing	China
+Tianjin	China
+Wuhan	China
+Harbin	China
+Shenyang	China
+Kanton [Guangzhou]	China
+Chengdu	China
+Santafé de Bogotá	Colombia
+Kinshasa	Congo, The Democratic Republic of the
+Seoul	South Korea
+Pusan	South Korea
+Ciudad de México	Mexico
+Rangoon (Yangon)	Myanmar
+Karachi	Pakistan
+Lahore	Pakistan
+Lima	Peru
+Berlin	Germany
+Riyadh	Saudi Arabia
+Singapore	Singapore
+Bangkok	Thailand
+Istanbul	Turkey
+Ankara	Turkey
+Moscow	Russian Federation
+St Petersburg	Russian Federation
+Ho Chi Minh City	Vietnam
+New York	United States
+Los Angeles	United States
+set join_cache_level=8;
+set join_buffer_size=256;
+EXPLAIN
+SELECT City.Name, Country.Name FROM City,Country
+WHERE City.Country=Country.Code AND City.Population > 3000000;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	City	range	Population,Country	Population	4	NULL	#	Using index condition; Using MRR
+1	SIMPLE	Country	eq_ref	PRIMARY	PRIMARY	3	world.City.Country	#	Using join buffer
+SELECT City.Name, Country.Name FROM City,Country
+WHERE City.Country=Country.Code AND City.Population > 3000000;
+Name	Name
+Sydney	Australia
+Dhaka	Bangladesh
+Rio de Janeiro	Brazil
+São Paulo	Brazil
+London	United Kingdom
+Santiago de Chile	Chile
+Alexandria	Egypt
+Cairo	Egypt
+Jakarta	Indonesia
+Delhi	India
+Calcutta [Kolkata]	India
+Mumbai (Bombay)	India
+Chennai (Madras)	India
+Baghdad	Iraq
+Teheran	Iran
+Tokyo	Japan
+Jokohama [Yokohama]	Japan
+Peking	China
+Chongqing	China
+Shanghai	China
+Wuhan	China
+Harbin	China
+Shenyang	China
+Kanton [Guangzhou]	China
+Tianjin	China
+Chengdu	China
+Santafé de Bogotá	Colombia
+Kinshasa	Congo, The Democratic Republic of the
+Seoul	South Korea
+Pusan	South Korea
+Ciudad de México	Mexico
+Rangoon (Yangon)	Myanmar
+Karachi	Pakistan
+Lahore	Pakistan
+Lima	Peru
+Berlin	Germany
+Riyadh	Saudi Arabia
+Singapore	Singapore
+Bangkok	Thailand
+Ankara	Turkey
+Istanbul	Turkey
+St Petersburg	Russian Federation
+Moscow	Russian Federation
+Ho Chi Minh City	Vietnam
+Los Angeles	United States
+New York	United States
+set join_buffer_size=default;
+set join_cache_level=6;
+ALTER TABLE Country MODIFY Name varchar(52) NOT NULL default '';
+SELECT City.Name, Country.Name FROM City,Country
+WHERE City.Country=Country.Code AND 
+Country.Name LIKE 'L%' AND City.Population > 100000;
+Name	Name
+Vientiane	Laos
+Riga	Latvia
+Daugavpils	Latvia
+Maseru	Lesotho
+Beirut	Lebanon
+Tripoli	Lebanon
+Monrovia	Liberia
+Tripoli	Libyan Arab Jamahiriya
+Bengasi	Libyan Arab Jamahiriya
+Misrata	Libyan Arab Jamahiriya
+Vilnius	Lithuania
+Kaunas	Lithuania
+Klaipeda	Lithuania
+?iauliai	Lithuania
+Panevezys	Lithuania
+ALTER TABLE Country MODIFY Name varchar(300) NOT NULL default '';
+SELECT City.Name, Country.Name FROM City,Country
+WHERE City.Country=Country.Code AND 
+Country.Name LIKE 'L%' AND City.Population > 100000;
+Name	Name
+Vientiane	Laos
+Riga	Latvia
+Daugavpils	Latvia
+Maseru	Lesotho
+Beirut	Lebanon
+Tripoli	Lebanon
+Monrovia	Liberia
+Tripoli	Libyan Arab Jamahiriya
+Bengasi	Libyan Arab Jamahiriya
+Misrata	Libyan Arab Jamahiriya
+Vilnius	Lithuania
+Kaunas	Lithuania
+Klaipeda	Lithuania
+?iauliai	Lithuania
+Panevezys	Lithuania
+ALTER TABLE Country ADD COLUMN PopulationBar text;
+UPDATE Country 
+SET PopulationBar=REPEAT('x', CAST(Population/100000 AS unsigned int));
+SELECT City.Name, Country.Name, Country.PopulationBar FROM City,Country
+WHERE City.Country=Country.Code AND 
+Country.Name LIKE 'L%' AND City.Population > 100000;
+Name	Name	PopulationBar
+Vientiane	Laos	xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
+Riga	Latvia	xxxxxxxxxxxxxxxxxxxxxxxx
+Daugavpils	Latvia	xxxxxxxxxxxxxxxxxxxxxxxx
+Maseru	Lesotho	xxxxxxxxxxxxxxxxxxxxxx
+Beirut	Lebanon	xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
+Tripoli	Lebanon	xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
+Monrovia	Liberia	xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
+Tripoli	Libyan Arab Jamahiriya	xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
+Bengasi	Libyan Arab Jamahiriya	xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
+Misrata	Libyan Arab Jamahiriya	xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
+Vilnius	Lithuania	xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
+Kaunas	Lithuania	xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
+Klaipeda	Lithuania	xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
+?iauliai	Lithuania	xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
+Panevezys	Lithuania	xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
+set join_buffer_size=256;
+SELECT City.Name, Country.Name, Country.PopulationBar FROM City,Country
+WHERE City.Country=Country.Code AND 
+Country.Name LIKE 'L%' AND City.Population > 100000;
+Name	Name	PopulationBar
+Vientiane	Laos	xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
+Riga	Latvia	xxxxxxxxxxxxxxxxxxxxxxxx
+Daugavpils	Latvia	xxxxxxxxxxxxxxxxxxxxxxxx
+Maseru	Lesotho	xxxxxxxxxxxxxxxxxxxxxx
+Beirut	Lebanon	xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
+Tripoli	Lebanon	xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
+Monrovia	Liberia	xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
+Tripoli	Libyan Arab Jamahiriya	xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
+Bengasi	Libyan Arab Jamahiriya	xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
+Misrata	Libyan Arab Jamahiriya	xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
+Vilnius	Lithuania	xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
+Kaunas	Lithuania	xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
+Klaipeda	Lithuania	xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
+?iauliai	Lithuania	xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
+Panevezys	Lithuania	xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
+set join_cache_level=default;
+set join_buffer_size=default;
+DROP DATABASE world;
+use test;
+CREATE TABLE t1(
+affiliatetometaid int  NOT NULL default '0',
+uniquekey int NOT NULL default '0',
+metaid int  NOT NULL default '0',
+affiliateid int  NOT NULL default '0',
+xml text,
+isactive char(1) NOT NULL default 'Y',
+PRIMARY KEY  (affiliatetometaid)
+);
+CREATE UNIQUE INDEX t1_uniquekey ON t1(uniquekey);
+CREATE INDEX t1_affiliateid ON t1(affiliateid);
+CREATE INDEX t1_metaid on t1 (metaid);
+INSERT INTO t1 VALUES
+(1616, 1571693233, 1391, 2, NULL, 'Y'), (1943, 1993216749, 1726, 2, NULL, 'Y');
+CREATE TABLE t2(
+metaid int  NOT NULL default '0',
+name varchar(80) NOT NULL default '',
+dateadded timestamp NOT NULL ,
+xml text,
+status int default NULL,
+origin int default NULL,
+gid int NOT NULL default '1',
+formattypeid int  default NULL,
+PRIMARY KEY  (metaid)
+);
+CREATE INDEX t2_status ON t2(status);
+CREATE INDEX t2_gid ON t2(gid);
+CREATE INDEX t2_formattypeid ON t2(formattypeid);
+INSERT INTO t2 VALUES
+(1391, "I Just Died", "2003-10-02 10:07:37", "", 1, NULL, 3, NULL),
+(1726, "Me, Myself & I", "2003-12-05 11:24:36", " ", 1, NULL, 3, NULL);
+CREATE TABLE t3(
+mediaid int  NOT NULL ,
+metaid int  NOT NULL default '0',
+formatid int  NOT NULL default '0',
+status int default NULL,
+path varchar(100) NOT NULL default '',
+datemodified timestamp NOT NULL ,
+resourcetype int  NOT NULL default '1',
+parameters text,
+signature int  default NULL,
+quality int  NOT NULL default '255',
+PRIMARY KEY  (mediaid)
+);
+CREATE INDEX t3_metaid ON t3(metaid);
+CREATE INDEX t3_formatid ON t3(formatid);
+CREATE INDEX t3_status ON t3(status);
+CREATE INDEX t3_metaidformatid ON t3(metaid,formatid);
+CREATE INDEX t3_signature ON t3(signature);
+CREATE INDEX t3_quality ON t3(quality);
+INSERT INTO t3 VALUES
+(6, 4, 8, 0, "010101_anastacia_spmidi.mid", "2004-03-16 13:40:00", 1, NULL, NULL, 255),
+(3343, 3, 8, 1, "010102_4VN4bsPwnxRQUJW5Zp1RhG2IL9vvl_8.mid", "2004-03-16 13:40:00", 1, NULL, NULL, 255);
+CREATE TABLE t4(
+formatid int  NOT NULL ,
+name varchar(60) NOT NULL default '',
+formatclassid int  NOT NULL default '0',
+mime varchar(60) default NULL,
+extension varchar(10) default NULL,
+priority int NOT NULL default '0',
+canaddtocapability char(1) NOT NULL default 'Y',
+PRIMARY KEY  (formatid)
+);
+CREATE INDEX t4_formatclassid ON t4(formatclassid);
+CREATE INDEX t4_formats_idx ON t4(canaddtocapability);
+INSERT INTO t4 VALUES
+(19, "XHTML", 11, "text/html", "xhtml", 10, 'Y'),
+(54, "AMR (wide band)", 13, "audio/amr-wb", "awb", 0, 'Y');
+CREATE TABLE t5(
+formatclassid int  NOT NULL ,
+name varchar(60) NOT NULL default '',
+priority int NOT NULL default '0',
+formattypeid int  NOT NULL default '0',
+PRIMARY KEY  (formatclassid)
+);
+CREATE INDEX t5_formattypeid on t5(formattypeid);
+INSERT INTO t5 VALUES
+(11, "Info", 0, 4), (13, "Digital Audio", 0, 2);
+CREATE TABLE t6(
+formattypeid int  NOT NULL ,
+name varchar(60) NOT NULL default '',
+priority int default NULL,
+PRIMARY KEY  (formattypeid)
+);
+INSERT INTO t6 VALUES
+(2, "Ringtones", 0);
+CREATE TABLE t7(
+metaid int  NOT NULL default '0',
+artistid int  NOT NULL default '0',
+PRIMARY KEY  (metaid,artistid)
+);
+INSERT INTO t7 VALUES
+(4, 5), (3, 4);
+CREATE TABLE t8(
+artistid int  NOT NULL ,
+name varchar(80) NOT NULL default '',
+PRIMARY KEY  (artistid)
+);
+INSERT INTO t8 VALUES
+(5, "Anastacia"), (4, "John Mayer");
+CREATE TABLE t9(
+subgenreid int  NOT NULL default '0',
+metaid int  NOT NULL default '0',
+PRIMARY KEY  (subgenreid,metaid)
+) ;
+CREATE INDEX t9_subgenreid ON t9(subgenreid);
+CREATE INDEX t9_metaid ON t9(metaid);
+INSERT INTO t9 VALUES 
+(138, 4), (31, 3);
+CREATE TABLE t10(
+subgenreid int  NOT NULL ,
+genreid int  NOT NULL default '0',
+name varchar(80) NOT NULL default '',
+PRIMARY KEY  (subgenreid)
+) ;
+CREATE INDEX t10_genreid ON t10(genreid);
+INSERT INTO t10 VALUES 
+(138, 19, ''), (31, 3, '');
+CREATE TABLE t11(
+genreid int  NOT NULL default '0',
+name char(80) NOT NULL default '',
+priority int NOT NULL default '0',
+masterclip char(1) default NULL,
+PRIMARY KEY  (genreid)
+) ;
+CREATE INDEX t11_masterclip ON t11( masterclip);
+INSERT INTO t11 VALUES
+(19, "Pop & Dance", 95, 'Y'), (3, "Rock & Alternative", 100, 'Y');
+set join_cache_level=6;
+EXPLAIN
+SELECT t1.uniquekey, t1.xml AS affiliateXml,
+t8.name AS artistName, t8.artistid, 
+t11.name AS genreName, t11.genreid, t11.priority AS genrePriority,
+t10.subgenreid, t10.name AS subgenreName,
+t2.name AS metaName, t2.metaid, t2.xml AS metaXml,
+t4.priority + t5.priority + t6.priority AS overallPriority,
+t3.path AS path, t3.mediaid, 
+t4.formatid, t4.name AS formatName, 
+t5.formatclassid, t5.name AS formatclassName, 
+t6.formattypeid, t6.name AS formattypeName 
+FROM t1, t2, t3, t4, t5, t6, t7, t8, t9, t10, t11
+WHERE t7.metaid = t2.metaid AND t7.artistid = t8.artistid AND
+t9.metaid = t2.metaid AND t9.subgenreid = t10.subgenreid AND 
+t10.genreid = t11.genreid AND  t3.metaid = t2.metaid AND
+t3.formatid = t4.formatid AND t4.formatclassid = t5.formatclassid AND
+t4.canaddtocapability =  'Y' AND t5.formattypeid = t6.formattypeid AND
+t6.formattypeid IN (2) AND (t3.formatid IN (31, 8, 76)) AND
+t1.metaid = t2.metaid AND t1.affiliateid = '2';
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t6	system	PRIMARY	NULL	NULL	NULL	1	
+1	SIMPLE	t1	ref	t1_affiliateid,t1_metaid	t1_affiliateid	4	const	1	
+1	SIMPLE	t4	ref	PRIMARY,t4_formatclassid,t4_formats_idx	t4_formats_idx	1	const	1	Using index condition; Using where; Using join buffer
+1	SIMPLE	t5	eq_ref	PRIMARY,t5_formattypeid	PRIMARY	4	test.t4.formatclassid	1	Using where; Using join buffer
+1	SIMPLE	t2	eq_ref	PRIMARY	PRIMARY	4	test.t1.metaid	1	Using join buffer
+1	SIMPLE	t7	ref	PRIMARY	PRIMARY	4	test.t1.metaid	1	Using index
+1	SIMPLE	t3	ref	t3_metaid,t3_formatid,t3_metaidformatid	t3_metaid	4	test.t1.metaid	2	Using where; Using join buffer
+1	SIMPLE	t8	eq_ref	PRIMARY	PRIMARY	4	test.t7.artistid	1	Using join buffer
+1	SIMPLE	t9	index	PRIMARY,t9_subgenreid,t9_metaid	PRIMARY	8	NULL	2	Using where; Using index; Using join buffer
+1	SIMPLE	t10	eq_ref	PRIMARY,t10_genreid	PRIMARY	4	test.t9.subgenreid	1	Using join buffer
+1	SIMPLE	t11	eq_ref	PRIMARY	PRIMARY	4	test.t10.genreid	1	Using join buffer
+SELECT t1.uniquekey, t1.xml AS affiliateXml,
+t8.name AS artistName, t8.artistid, 
+t11.name AS genreName, t11.genreid, t11.priority AS genrePriority,
+t10.subgenreid, t10.name AS subgenreName,
+t2.name AS metaName, t2.metaid, t2.xml AS metaXml,
+t4.priority + t5.priority + t6.priority AS overallPriority,
+t3.path AS path, t3.mediaid, 
+t4.formatid, t4.name AS formatName, 
+t5.formatclassid, t5.name AS formatclassName, 
+t6.formattypeid, t6.name AS formattypeName 
+FROM t1, t2, t3, t4, t5, t6, t7, t8, t9, t10, t11
+WHERE t7.metaid = t2.metaid AND t7.artistid = t8.artistid AND
+t9.metaid = t2.metaid AND t9.subgenreid = t10.subgenreid AND 
+t10.genreid = t11.genreid AND  t3.metaid = t2.metaid AND
+t3.formatid = t4.formatid AND t4.formatclassid = t5.formatclassid AND
+t4.canaddtocapability =  'Y' AND t5.formattypeid = t6.formattypeid AND
+t6.formattypeid IN (2) AND (t3.formatid IN (31, 8, 76)) AND
+t1.metaid = t2.metaid AND t1.affiliateid = '2';
+uniquekey	affiliateXml	artistName	artistid	genreName	genreid	genrePriority	subgenreid	subgenreName	metaName	metaid	metaXml	overallPriority	path	mediaid	formatid	formatName	formatclassid	formatclassName	formattypeid	formattypeName
+DROP TABLE t1,t2,t3,t4,t5,t6,t7,t8,t9,t10,t11;
+CREATE TABLE t1 (a1 int, filler1 char(64) default ' ' );
+CREATE TABLE t2 (
+a2 int, b2 int, filler2 char(64) default ' ', 
+PRIMARY KEY idx(a2,b2,filler2)
+) ;
+CREATE TABLE t3 (b3 int, c3 int, INDEX idx(b3));
+INSERT INTO t1(a1) VALUES 
+(4), (7), (1), (9), (8), (5), (3), (6), (2);
+INSERT INTO t2(a2,b2) VALUES
+(1,30), (3,40), (2,61), (6,73), (8,92), (9,27), (4,18), (5,84), (7,56),
+(4,14), (6,76), (8,98), (7,55), (1,39), (2,68), (3,45), (9,21), (5,81),
+(5,88), (2,65), (6,74), (9,23), (1,37), (3,44), (4,17), (8,99), (7,51),
+(9,28), (7,52), (1,33), (4,13), (5,87), (3,43), (8,91), (2,62), (6,79),
+(3,49), (8,93), (7,34), (5,82), (6,78), (2,63), (1,32), (9,22), (4,11);
+INSERT INTO t3 VALUES
+(30,302), (92,923), (18,187), (45,459), (30,309), 
+(39,393), (68,685), (45,458), (21,210), (81,817),
+(40,405), (61,618), (73,738), (92,929), (27,275),
+(18,188), (84,846), (56,564), (14,144), (76,763), 
+(98,982), (55,551), (17,174), (99,998), (51,513),
+(28,282), (52,527), (33,336), (13,138), (87,878), 
+(43,431), (91,916), (62,624), (79,797), (49,494),
+(93,933), (34,347), (82,829), (78,780), (63,634), 
+(32,329), (22,228), (11,114), (74,749), (23,236);
+set join_cache_level=1;
+EXPLAIN
+SELECT a1<>a2, a1, a2, b2, b3, c3,
+SUBSTR(filler1,1,1) AS s1, SUBSTR(filler2,1,1) AS s2
+FROM t1,t2,t3 WHERE a1=a2 AND b2=b3 AND MOD(c3,10)>7;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	9	
+1	SIMPLE	t2	ref	PRIMARY	PRIMARY	4	test.t1.a1	1	Using index
+1	SIMPLE	t3	ref	idx	idx	5	test.t2.b2	5	Using where
+SELECT a1<>a2, a1, a2, b2, b3, c3,
+SUBSTR(filler1,1,1) AS s1, SUBSTR(filler2,1,1) AS s2
+FROM t1,t2,t3 WHERE a1=a2 AND b2=b3 AND MOD(c3,10)>7;
+a1<>a2	a1	a2	b2	b3	c3	s1	s2
+0	4	4	13	13	138		
+0	4	4	18	18	188		
+0	1	1	30	30	309		
+0	1	1	32	32	329		
+0	9	9	22	22	228		
+0	8	8	92	92	929		
+0	8	8	99	99	998		
+0	5	5	82	82	829		
+0	5	5	87	87	878		
+0	3	3	45	45	459		
+0	3	3	45	45	458		
+0	6	6	73	73	738		
+0	6	6	74	74	749		
+0	2	2	61	61	618		
+set join_cache_level=5;
+set join_buffer_size=512;
+EXPLAIN
+SELECT a1<>a2, a1, a2, b2, b3, c3,
+SUBSTR(filler1,1,1) AS s1, SUBSTR(filler2,1,1) AS s2
+FROM t1,t2,t3 WHERE a1=a2 AND b2=b3 AND MOD(c3,10)>7;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	9	
+1	SIMPLE	t2	ref	PRIMARY	PRIMARY	4	test.t1.a1	1	Using index
+1	SIMPLE	t3	ref	idx	idx	5	test.t2.b2	5	Using where; Using join buffer
+SELECT a1<>a2, a1, a2, b2, b3, c3,
+SUBSTR(filler1,1,1) AS s1, SUBSTR(filler2,1,1) AS s2
+FROM t1,t2,t3 WHERE a1=a2 AND b2=b3 AND MOD(c3,10)>7;
+a1<>a2	a1	a2	b2	b3	c3	s1	s2
+0	4	4	18	18	188		
+0	4	4	13	13	138		
+0	1	1	30	30	309		
+0	1	1	32	32	329		
+0	9	9	22	22	228		
+0	8	8	92	92	929		
+0	8	8	99	99	998		
+0	5	5	82	82	829		
+0	3	3	45	45	459		
+0	3	3	45	45	458		
+0	5	5	87	87	878		
+0	2	2	61	61	618		
+0	6	6	73	73	738		
+0	6	6	74	74	749		
+DROP TABLE t1,t2,t3;
+CREATE TABLE t1 (a int, b int, INDEX idx(b));
+CREATE TABLE t2 (a int, b int, INDEX idx(a));
+INSERT INTO t1 VALUES (5,30), (3,20), (7,40), (2,10), (8,30), (1,10), (4,20);
+INSERT INTO t2 VALUES (7,10), (1,20), (2,20), (8,20), (8,10), (1,20);
+INSERT INTO t2 VALUES (1,10), (4,20), (3,20), (7,20), (7,10), (1,20);
+set join_buffer_size=32;
+Warnings:
+Warning	1292	Truncated incorrect join_buffer_size value: '32'
+set join_cache_level=8;
+EXPLAIN SELECT * FROM t1,t2 WHERE t1.a=t2.a AND t1.b >= 30;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	ALL	idx	NULL	NULL	NULL	7	Using where
+1	SIMPLE	t2	ref	idx	idx	5	test.t1.a	2	Using join buffer
+SELECT * FROM t1,t2 WHERE t1.a=t2.a AND t1.b >= 30;
+a	b	a	b
+7	40	7	10
+7	40	7	10
+7	40	7	20
+8	30	8	10
+8	30	8	20
+DROP TABLE t1,t2;
+#
+# Bug #40134: outer join with not exists optimization and join buffer
+#
+set join_cache_level=default;
+set join_buffer_size=default;
+CREATE TABLE t1 (a int NOT NULL);
+INSERT INTO t1 VALUES (2), (4), (3), (5), (1);
+CREATE TABLE t2 (a int NOT NULL, b int NOT NULL, INDEX i_a(a));
+INSERT INTO t2 VALUES (4,10), (2,10), (2,30), (2,20), (4,20);
+EXPLAIN
+SELECT * FROM t1 LEFT JOIN t2 ON t1.a=t2.a WHERE t2.b IS NULL;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	5	
+1	SIMPLE	t2	ref	i_a	i_a	4	test.t1.a	2	Using where; Not exists
+SELECT * FROM t1 LEFT JOIN t2 ON t1.a=t2.a WHERE t2.b IS NULL;
+a	a	b
+3	NULL	NULL
+5	NULL	NULL
+1	NULL	NULL
+SET join_cache_level=6;
+EXPLAIN
+SELECT * FROM t1 LEFT JOIN t2 ON t1.a=t2.a WHERE t2.b IS NULL;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	5	
+1	SIMPLE	t2	ref	i_a	i_a	4	test.t1.a	2	Using where; Not exists; Using join buffer
+SELECT * FROM t1 LEFT JOIN t2 ON t1.a=t2.a WHERE t2.b IS NULL;
+a	a	b
+3	NULL	NULL
+5	NULL	NULL
+1	NULL	NULL
+DROP TABLE t1, t2;
+set join_cache_level=default;
+set join_buffer_size=default;
+#
+# BUG#40136: Group by is ignored when join buffer is used for an outer join
+#
+create table t1(a int PRIMARY KEY, b int);
+insert into t1 values
+(5, 10), (2, 70), (7, 80), (6, 20), (1, 50), (9, 40), (8, 30), (3, 60);
+create table t2 (p int, a int, INDEX i_a(a));
+insert into t2 values
+(103, 7), (109, 3), (102, 3), (108, 1), (106, 3),
+(107, 7), (105, 1), (101, 3), (100, 7), (110, 1);
+set @save_join_cache_level=@@join_cache_level;
+set join_cache_level=6;
+The following must not show "using join cache":
+explain
+select t1.a, count(t2.p) as count
+from t1 left join t2 on t1.a=t2.a and t2.p % 2 = 1 group by t1.a;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	8	Using temporary; Using filesort
+1	SIMPLE	t2	ref	i_a	i_a	5	test.t1.a	2	Using where; Using join buffer
+select t1.a, count(t2.p) as count
+from t1 left join t2 on t1.a=t2.a and t2.p % 2 = 1 group by t1.a;
+a	count
+1	1
+2	0
+3	2
+5	0
+6	0
+7	2
+8	0
+9	0
+set join_cache_level=@save_join_cache_level;
+drop table t1, t2;
+#
+# BUG#40268: Nested outer join with not null-rejecting where condition
+#            over an inner table which is not the last in the nest
+#
+CREATE TABLE t2 (a int, b int, c int);
+CREATE TABLE t3 (a int, b int, c int);
+CREATE TABLE t4 (a int, b int, c int);
+INSERT INTO t2 VALUES (3,3,0), (4,2,0), (5,3,0);
+INSERT INTO t3 VALUES (1,2,0), (2,2,0);
+INSERT INTO t4 VALUES (3,2,0), (4,2,0);
+set join_cache_level=6;
+SELECT t2.a,t2.b,t3.a,t3.b,t4.a,t4.b
+FROM t2 LEFT JOIN (t3, t4) ON t2.b=t4.b
+WHERE t3.a+2<t2.a OR t3.c IS NULL;
+a	b	a	b	a	b
+4	2	1	2	3	2
+4	2	1	2	4	2
+3	3	NULL	NULL	NULL	NULL
+5	3	NULL	NULL	NULL	NULL
+set join_cache_level=default;
+DROP TABLE t2, t3, t4;
+#
+# Bug #40192: outer join with where clause when using BNL 
+#
+create table t1 (a int, b int);
+insert into t1 values (2, 20), (3, 30), (1, 10);
+create table t2 (a int, c int);
+insert into t2 values (1, 101), (3, 102), (1, 100);
+set join_cache_level=6;
+select * from t1 left join t2 on t1.a=t2.a;
+a	b	a	c
+1	10	1	101
+3	30	3	102
+1	10	1	100
+2	20	NULL	NULL
+explain select * from t1 left join t2 on t1.a=t2.a where t2.c=102 or t2.c is null;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	3	Using where; Using join buffer
+select * from t1 left join t2 on t1.a=t2.a where t2.c=102 or t2.c is null;
+a	b	a	c
+3	30	3	102
+2	20	NULL	NULL
+set join_cache_level=default;
+drop table t1, t2;
+#
+# Bug #40317: outer join with with constant on expression equal to FALSE
+#
+create table t1 (a int);
+insert into t1 values (30), (40), (20);
+create table t2 (b int);
+insert into t2 values (200), (100);
+set join_cache_level=6;
+select * from t1 left join t2 on (1=0);
+a	b
+30	NULL
+40	NULL
+20	NULL
+explain select * from t1 left join t2 on (1=0) where a=40;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	Using where
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	2	Using where; Using join buffer
+select * from t1 left join t2 on (1=0) where a=40;
+a	b
+40	NULL
+set join_cache_level=1;
+explain select * from t1 left join t2 on (1=0);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	2	Using where
+set join_cache_level=default;
+drop table t1, t2;
+#
+# Bug #41204: small buffer with big rec_per_key for ref access
+#
+CREATE TABLE t1 (a int);
+INSERT INTO t1 VALUES (0);
+INSERT INTO t1(a) SELECT a FROM t1;
+INSERT INTO t1(a) SELECT a FROM t1;
+INSERT INTO t1(a) SELECT a FROM t1;
+INSERT INTO t1(a) SELECT a FROM t1;
+INSERT INTO t1(a) SELECT a FROM t1;
+INSERT INTO t1(a) SELECT a FROM t1;
+INSERT INTO t1(a) SELECT a FROM t1;
+INSERT INTO t1(a) SELECT a FROM t1;
+INSERT INTO t1(a) SELECT a FROM t1;
+INSERT INTO t1(a) SELECT a FROM t1;
+INSERT INTO t1(a) SELECT a FROM t1;
+INSERT INTO t1 VALUES (20000), (10000);
+CREATE TABLE t2 (pk int AUTO_INCREMENT PRIMARY KEY, b int, c int, INDEX idx(b));
+INSERT INTO t2(b,c) VALUES (10000, 3), (20000, 7), (20000, 1), (10000, 9), (20000, 5);
+INSERT INTO t2(b,c) SELECT b,c FROM t2;
+INSERT INTO t2(b,c) SELECT b,c FROM t2;
+INSERT INTO t2(b,c) SELECT b,c FROM t2;
+INSERT INTO t2(b,c) SELECT b,c FROM t2;
+INSERT INTO t2(b,c) SELECT b,c FROM t2;
+INSERT INTO t2(b,c) SELECT b,c FROM t2;
+INSERT INTO t2(b,c) SELECT b,c FROM t2;
+INSERT INTO t2(b,c) SELECT b,c FROM t2;
+ANALYZE TABLE t1,t2;
+set join_cache_level=6;
+set join_buffer_size=1024;
+EXPLAIN SELECT AVG(c) FROM t1,t2 WHERE t1.a=t2.b;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	2050	
+1	SIMPLE	t2	ref	idx	idx	5	test.t1.a	640	Using join buffer
+SELECT AVG(c) FROM t1,t2 WHERE t1.a=t2.b;
+AVG(c)
+5.0000
+set join_buffer_size=default;
+set join_cache_level=default;
+DROP TABLE t1, t2;
+#
+# Bug #41894: big join buffer of level 7 used to join records
+#              with null values in place of varchar strings
+#
+CREATE TABLE t1 (a int NOT NULL AUTO_INCREMENT PRIMARY KEY,
+b varchar(127) DEFAULT NULL);
+INSERT INTO t1(a) VALUES (1);
+INSERT INTO t1(b) SELECT b FROM t1;
+INSERT INTO t1(b) SELECT b FROM t1;
+INSERT INTO t1(b) SELECT b FROM t1;
+INSERT INTO t1(b) SELECT b FROM t1;
+INSERT INTO t1(b) SELECT b FROM t1;
+INSERT INTO t1(b) SELECT b FROM t1;
+INSERT INTO t1(b) SELECT b FROM t1;
+INSERT INTO t1(b) SELECT b FROM t1;
+INSERT INTO t1(b) SELECT b FROM t1;
+INSERT INTO t1(b) SELECT b FROM t1;
+INSERT INTO t1(b) SELECT b FROM t1;
+INSERT INTO t1(b) SELECT b FROM t1;
+INSERT INTO t1(b) SELECT b FROM t1;
+INSERT INTO t1(b) SELECT b FROM t1;
+CREATE TABLE t2 (a int NOT NULL PRIMARY KEY, b varchar(127) DEFAULT NULL);
+INSERT INTO t2 SELECT * FROM t1;
+CREATE TABLE t3 (a int NOT NULL PRIMARY KEY, b varchar(127) DEFAULT NULL);
+INSERT INTO t3 SELECT * FROM t1;
+set join_cache_level=7;
+set join_buffer_size=1024*1024;
+EXPLAIN
+SELECT COUNT(*) FROM t1,t2,t3
+WHERE t1.a=t2.a AND t2.a=t3.a AND
+t1.b IS NULL AND t2.b IS NULL AND t3.b IS NULL;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	ALL	PRIMARY	NULL	NULL	NULL	16384	Using where
+1	SIMPLE	t2	eq_ref	PRIMARY	PRIMARY	4	test.t1.a	1	Using where; Using join buffer
+1	SIMPLE	t3	eq_ref	PRIMARY	PRIMARY	4	test.t1.a	1	Using where; Using join buffer
+SELECT COUNT(*) FROM t1,t2,t3
+WHERE t1.a=t2.a AND t2.a=t3.a AND
+t1.b IS NULL AND t2.b IS NULL AND t3.b IS NULL;
+COUNT(*)
+16384
+set join_buffer_size=default;
+set join_cache_level=default;
+DROP TABLE t1,t2,t3;
+#
+# Bug #42020: join buffer is used  for outer join with fields of 
+#             several outer tables in join buffer
+#
+CREATE TABLE t1 (
+a bigint NOT NULL,
+PRIMARY KEY (a) 
+);
+INSERT INTO t1 VALUES
+(2), (1);
+CREATE TABLE t2 (
+a bigint NOT NULL,
+b bigint NOT NULL,
+PRIMARY KEY (a,b)
+);
+INSERT INTO t2 VALUES
+(2,30), (2,40), (2,50), (2,60), (2,70), (2,80),
+(1,10), (1, 20), (1,30), (1,40), (1,50);
+CREATE TABLE t3 (
+pk bigint NOT NULL AUTO_INCREMENT,
+a bigint NOT NULL,
+b bigint NOT NULL,
+val bigint DEFAULT '0',
+PRIMARY KEY (pk),
+KEY idx (a,b)
+);
+INSERT INTO t3(a,b) VALUES
+(2,30), (2,40), (2,50), (2,60), (2,70), (2,80),
+(4,30), (4,40), (4,50), (4,60), (4,70), (4,80),
+(5,30), (5,40), (5,50), (5,60), (5,70), (5,80),
+(7,30), (7,40), (7,50), (7,60), (7,70), (7,80);
+SELECT t1.a, t2.a, t3.a, t2.b, t3.b, t3.val 
+FROM (t1,t2) LEFT JOIN t3 ON (t1.a=t3.a AND t2.b=t3.b) 
+WHERE t1.a=t2.a;
+a	a	a	b	b	val
+1	1	NULL	10	NULL	NULL
+1	1	NULL	20	NULL	NULL
+1	1	NULL	30	NULL	NULL
+1	1	NULL	40	NULL	NULL
+1	1	NULL	50	NULL	NULL
+2	2	2	30	30	0
+2	2	2	40	40	0
+2	2	2	50	50	0
+2	2	2	60	60	0
+2	2	2	70	70	0
+2	2	2	80	80	0
+set join_cache_level=6;
+set join_buffer_size=256;
+EXPLAIN
+SELECT t1.a, t2.a, t3.a, t2.b, t3.b, t3.val 
+FROM (t1,t2) LEFT JOIN t3 ON (t1.a=t3.a AND t2.b=t3.b) 
+WHERE t1.a=t2.a;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	index	PRIMARY	PRIMARY	8	NULL	2	Using index
+1	SIMPLE	t2	ref	PRIMARY	PRIMARY	8	test.t1.a	1	Using index
+1	SIMPLE	t3	ref	idx	idx	16	test.t1.a,test.t2.b	2	Using join buffer
+SELECT t1.a, t2.a, t3.a, t2.b, t3.b, t3.val 
+FROM (t1,t2) LEFT JOIN t3 ON (t1.a=t3.a AND t2.b=t3.b) 
+WHERE t1.a=t2.a;
+a	a	a	b	b	val
+1	1	NULL	10	NULL	NULL
+1	1	NULL	20	NULL	NULL
+1	1	NULL	30	NULL	NULL
+1	1	NULL	40	NULL	NULL
+1	1	NULL	50	NULL	NULL
+2	2	2	30	30	0
+2	2	2	40	40	0
+2	2	2	50	50	0
+2	2	2	60	60	0
+2	2	2	70	70	0
+2	2	2	80	80	0
+DROP INDEX idx ON t3;
+set join_cache_level=4;
+EXPLAIN
+SELECT t1.a, t2.a, t3.a, t2.b, t3.b, t3.val 
+FROM (t1,t2) LEFT JOIN t3 ON (t1.a=t3.a AND t2.b=t3.b) 
+WHERE t1.a=t2.a;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	index	PRIMARY	PRIMARY	8	NULL	2	Using index
+1	SIMPLE	t2	ref	PRIMARY	PRIMARY	8	test.t1.a	1	Using index
+1	SIMPLE	t3	ALL	NULL	NULL	NULL	NULL	24	Using where; Using join buffer
+SELECT t1.a, t2.a, t3.a, t2.b, t3.b, t3.val 
+FROM (t1,t2) LEFT JOIN t3 ON (t1.a=t3.a AND t2.b=t3.b) 
+WHERE t1.a=t2.a;
+a	a	a	b	b	val
+1	1	NULL	10	NULL	NULL
+1	1	NULL	20	NULL	NULL
+1	1	NULL	30	NULL	NULL
+1	1	NULL	40	NULL	NULL
+1	1	NULL	50	NULL	NULL
+2	2	2	30	30	0
+2	2	2	40	40	0
+2	2	2	50	50	0
+2	2	2	60	60	0
+2	2	2	70	70	0
+2	2	2	80	80	0
+set join_buffer_size=default;
+set join_cache_level=default;
+DROP TABLE t1,t2,t3;
+create table t1(f1 int, f2 int);
+insert into t1 values (1,1),(2,2),(3,3);
+create table t2(f1 int not null, f2 int not null, f3 char(200), key(f1,f2));
+insert into t2 values (1,1, 'qwerty'),(1,2, 'qwerty'),(1,3, 'qwerty');
+insert into t2 values (2,1, 'qwerty'),(2,2, 'qwerty'),(2,3, 'qwerty'),
+(2,4, 'qwerty'),(2,5, 'qwerty');
+insert into t2 values (3,1, 'qwerty'),(3,4, 'qwerty');
+insert into t2 values (4,1, 'qwerty'),(4,2, 'qwerty'),(4,3, 'qwerty'),
+(4,4, 'qwerty');
+insert into t2 values (1,1, 'qwerty'),(1,2, 'qwerty'),(1,3, 'qwerty');
+insert into t2 values (2,1, 'qwerty'),(2,2, 'qwerty'),(2,3, 'qwerty'),
+(2,4, 'qwerty'),(2,5, 'qwerty');
+insert into t2 values (3,1, 'qwerty'),(3,4, 'qwerty');
+insert into t2 values (4,1, 'qwerty'),(4,2, 'qwerty'),(4,3, 'qwerty'),
+(4,4, 'qwerty');
+set join_cache_level=5;
+select t2.f1, t2.f2, t2.f3 from t1,t2
+where t1.f1=t2.f1 and t2.f2 between t1.f1 and t1.f2 and t2.f2 + 1 >= t1.f1 + 1;
+f1	f2	f3
+1	1	qwerty
+2	2	qwerty
+1	1	qwerty
+2	2	qwerty
+explain select t2.f1, t2.f2, t2.f3 from t1,t2
+where t1.f1=t2.f1 and t2.f2 between t1.f1 and t2.f2;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	
+1	SIMPLE	t2	ref	f1	f1	4	test.t1.f1	3	Using index condition(BKA); Using join buffer
+set join_cache_level=6;
+select t2.f1, t2.f2, t2.f3 from t1,t2
+where t1.f1=t2.f1 and t2.f2 between t1.f1 and t1.f2 and t2.f2 + 1 >= t1.f1 + 1;
+f1	f2	f3
+1	1	qwerty
+2	2	qwerty
+1	1	qwerty
+2	2	qwerty
+explain select t2.f1, t2.f2, t2.f3 from t1,t2
+where t1.f1=t2.f1 and t2.f2 between t1.f1 and t2.f2;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	
+1	SIMPLE	t2	ref	f1	f1	4	test.t1.f1	3	Using index condition(BKA); Using join buffer
+set join_cache_level=7;
+select t2.f1, t2.f2, t2.f3 from t1,t2
+where t1.f1=t2.f1 and t2.f2 between t1.f1 and t1.f2 and t2.f2 + 1 >= t1.f1 + 1;
+f1	f2	f3
+1	1	qwerty
+2	2	qwerty
+1	1	qwerty
+2	2	qwerty
+explain select t2.f1, t2.f2, t2.f3 from t1,t2
+where t1.f1=t2.f1 and t2.f2 between t1.f1 and t2.f2;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	
+1	SIMPLE	t2	ref	f1	f1	4	test.t1.f1	3	Using index condition(BKA); Using join buffer
+set join_cache_level=8;
+select t2.f1, t2.f2, t2.f3 from t1,t2
+where t1.f1=t2.f1 and t2.f2 between t1.f1 and t1.f2 and t2.f2 + 1 >= t1.f1 + 1;
+f1	f2	f3
+1	1	qwerty
+2	2	qwerty
+1	1	qwerty
+2	2	qwerty
+explain select t2.f1, t2.f2, t2.f3 from t1,t2
+where t1.f1=t2.f1 and t2.f2 between t1.f1 and t2.f2;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	
+1	SIMPLE	t2	ref	f1	f1	4	test.t1.f1	3	Using index condition(BKA); Using join buffer
+drop table t1,t2;
+set join_cache_level=default;
+#
+# Bug #42955: join with GROUP BY/ORDER BY and when BKA is enabled 
+#             
+create table t1 (d int, id1 int, index idx1 (d, id1));
+insert into t1 values
+(3, 20), (2, 40), (3, 10), (1, 10), (3, 20), (1, 40), (2, 30), (3, 30);
+create table t2 (id1 int, id2 int, index idx2 (id1));
+insert into t2 values 
+(20, 100), (30, 400), (20, 400), (30, 200), (10, 300), (10, 200), (40, 100),
+(40, 200), (30, 300), (10, 400), (20, 200), (20, 300);
+set join_cache_level=6;
+explain
+select t1.id1, sum(t2.id2) from t1 join t2 on t1.id1=t2.id1 
+where t1.d=3 group by t1.id1;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	ref	idx1	idx1	5	const	4	Using index; Using temporary; Using filesort
+1	SIMPLE	t2	ref	idx2	idx2	5	test.t1.id1	2	Using join buffer
+select t1.id1, sum(t2.id2) from t1 join t2 on t1.id1=t2.id1 
+where t1.d=3 group by t1.id1;
+id1	sum(t2.id2)
+10	900
+20	2000
+30	900
+explain
+select t1.id1  from t1 join t2 on t1.id1=t2.id1 
+where t1.d=3 and t2.id2 > 200 order by t1.id1;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	ref	idx1	idx1	5	const	4	Using index; Using temporary; Using filesort
+1	SIMPLE	t2	ref	idx2	idx2	5	test.t1.id1	2	Using where; Using join buffer
+select t1.id1  from t1 join t2 on t1.id1=t2.id1 
+where t1.d=3 and t2.id2 > 200 order by t1.id1;
+id1
+10
+10
+20
+20
+20
+20
+30
+30
+set join_cache_level=default;
+drop table t1,t2;
+#
+# Bug #44019: star-like multi-join query executed join_cache_level=6 
+#             
+create table t1 (a int, b int, c int, d int);
+create table t2 (b int, e varchar(16), index idx(b));
+create table t3 (d int, f varchar(16), index idx(d));
+create table t4 (c int, g varchar(16), index idx(c));
+insert into t1 values
+(5, 50, 500, 5000), (3, 30, 300, 3000), (9, 90, 900, 9000),
+(2, 20, 200, 2000), (4, 40, 400, 4000), (8, 80, 800, 800),
+(7, 70, 700, 7000);
+insert into t2 values
+(30, 'bbb'), (10, 'b'), (70, 'bbbbbbb'), (60, 'bbbbbb'),
+(31, 'bbb'), (11, 'b'), (71, 'bbbbbbb'), (61, 'bbbbbb'),
+(32, 'bbb'), (12, 'b'), (72, 'bbbbbbb'), (62, 'bbbbbb');
+insert into t3 values
+(4000, 'dddd'), (3000, 'ddd'), (1000, 'd'), (8000, 'dddddddd'),
+(4001, 'dddd'), (3001, 'ddd'), (1001, 'd'), (8001, 'dddddddd'),
+(4002, 'dddd'), (3002, 'ddd'), (1002, 'd'), (8002, 'dddddddd');
+insert into t4 values
+(200, 'cc'), (600, 'cccccc'), (300, 'ccc'), (500, 'ccccc'),
+(201, 'cc'), (601, 'cccccc'), (301, 'ccc'), (501, 'ccccc'),
+(202, 'cc'), (602, 'cccccc'), (302, 'ccc'), (502, 'ccccc');
+analyze table t2,t3,t4;
+set join_cache_level=1;
+explain 
+select t1.a, t1.b, t1.c, t1.d, t2.e, t3.f, t4.g from t1,t2,t3,t4
+where t2.b=t1.b and t3.d=t1.d and t4.c=t1.c;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	7	
+1	SIMPLE	t2	ref	idx	idx	5	test.t1.b	1	
+1	SIMPLE	t3	ref	idx	idx	5	test.t1.d	1	
+1	SIMPLE	t4	ref	idx	idx	5	test.t1.c	1	
+select t1.a, t1.b, t1.c, t1.d, t2.e, t3.f, t4.g from t1,t2,t3,t4
+where t2.b=t1.b and t3.d=t1.d and t4.c=t1.c;
+a	b	c	d	e	f	g
+3	30	300	3000	bbb	ddd	ccc
+set join_cache_level=6;
+explain 
+select t1.a, t1.b, t1.c, t1.d, t2.e, t3.f, t4.g from t1,t2,t3,t4
+where t2.b=t1.b and t3.d=t1.d and t4.c=t1.c;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	7	
+1	SIMPLE	t2	ref	idx	idx	5	test.t1.b	1	Using join buffer
+1	SIMPLE	t3	ref	idx	idx	5	test.t1.d	1	Using join buffer
+1	SIMPLE	t4	ref	idx	idx	5	test.t1.c	1	Using join buffer
+select t1.a, t1.b, t1.c, t1.d, t2.e, t3.f, t4.g from t1,t2,t3,t4
+where t2.b=t1.b and t3.d=t1.d and t4.c=t1.c;
+a	b	c	d	e	f	g
+3	30	300	3000	bbb	ddd	ccc
+set join_cache_level=default;
+drop table t1,t2,t3,t4;
+#
+# Bug #44250: Corruption of linked join buffers when using BKA 
+#             
+CREATE TABLE t1 (
+id1 bigint(20) DEFAULT NULL,
+id2 bigint(20) DEFAULT NULL,
+id3 bigint(20) DEFAULT NULL,
+num1 bigint(20) DEFAULT NULL,
+num2 int(11) DEFAULT NULL,
+num3 bigint(20) DEFAULT NULL
+);
+CREATE TABLE t2 (
+id3 bigint(20) NOT NULL DEFAULT '0',
+id4 bigint(20) DEFAULT NULL,
+enum1 enum('Enabled','Disabled','Paused') DEFAULT NULL,
+PRIMARY KEY (id3)
+);
+CREATE TABLE t3 (
+id4 bigint(20) NOT NULL DEFAULT '0',
+text1 text,
+PRIMARY KEY (id4)
+);
+CREATE TABLE t4 (
+id2 bigint(20) NOT NULL DEFAULT '0',
+dummy int(11) DEFAULT '0',
+PRIMARY KEY (id2)
+);
+CREATE TABLE t5 (
+id1 bigint(20) NOT NULL DEFAULT '0',
+id2 bigint(20) NOT NULL DEFAULT '0',
+enum2 enum('Active','Deleted','Paused') DEFAULT NULL,
+PRIMARY KEY (id1,id2)
+);
+set join_cache_level=8;
+set join_buffer_size=2048;
+EXPLAIN
+SELECT STRAIGHT_JOIN t1.id1, t1.num3, t3.text1, t3.id4, t2.id3, t4.dummy
+FROM t1 JOIN  t2 JOIN  t3 JOIN  t4 JOIN  t5 
+WHERE t1.id1=t5.id1 AND t1.id2=t5.id2 and  t4.id2=t1.id2 AND
+t5.enum2='Active' AND t3.id4=t2.id4 AND t2.id3=t1.id3 AND t3.text1<'D';
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	349	
+1	SIMPLE	t2	eq_ref	PRIMARY	PRIMARY	8	test.t1.id3	1	Using join buffer
+1	SIMPLE	t3	eq_ref	PRIMARY	PRIMARY	8	test.t2.id4	1	Using where; Using join buffer
+1	SIMPLE	t4	eq_ref	PRIMARY	PRIMARY	8	test.t1.id2	1	Using join buffer
+1	SIMPLE	t5	eq_ref	PRIMARY	PRIMARY	16	test.t1.id1,test.t1.id2	1	Using where; Using join buffer
+SELECT STRAIGHT_JOIN t1.id1, t1.num3, t3.text1, t3.id4, t2.id3, t4.dummy
+FROM t1 JOIN  t2 JOIN  t3 JOIN  t4 JOIN  t5 
+WHERE t1.id1=t5.id1 AND t1.id2=t5.id2 and  t4.id2=t1.id2 AND
+t5.enum2='Active' AND t3.id4=t2.id4 AND t2.id3=t1.id3 AND t3.text1<'D';
+id1	num3	text1	id4	id3	dummy
+228172702	14	AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA	2567095402	2667134182	0
+228172702	15	AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA	2567095402	2667134182	0
+228172702	3	AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA	2567095402	2667134182	0
+228172702	134	AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA	2567095402	2667134182	0
+228808822	61	CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC	826928662	935693782	0
+228808822	13	CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC	826928662	935693782	0
+228808822	60	CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC	826928662	935693782	0
+228808822	13	CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC	826928662	935693782	0
+228808822	3	CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC	826928662	935693782	0
+228808822	4	CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC	826928662	935693782	0
+228808822	6	CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC	826928662	935693782	0
+228808822	17	CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC	826928662	935693782	0
+228808822	50	CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC	826928662	935693782	0
+228808822	18	CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC	826928662	935693782	0
+228808822	1	CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC	826928662	935693782	0
+228808822	3	CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC	826928662	935693782	0
+228808822	4	CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC	826928662	935693782	0
+228808822	89	CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC	2381969632	2482416112	0
+228808822	19	CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC	2381969632	2482416112	0
+228808822	84	CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC	2381969632	2482416112	0
+228808822	14	CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC	2381969632	2482416112	0
+228808822	9	CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC	2381969632	2482416112	0
+228808822	1	CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC	2381969632	2482416112	0
+228808822	10	CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC	2381969632	2482416112	0
+228808822	26	CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC	2381969632	2482416112	0
+228808822	4	CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC	2381969632	2482416112	0
+228808822	3	CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC	2381969632	2482416112	0
+228808822	1	CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC	2381969632	2482416112	0
+228808822	3	CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC	2381969632	2482416112	0
+228808822	28	CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC	2381969632	2482416112	0
+228808822	62	CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC	2381969632	2482416112	0
+set join_buffer_size=default;
+set join_cache_level=default;
+DROP TABLE t1,t2,t3,t4,t5;
+#
+# Bug#45267: Incomplete check caused wrong result.
+#
+CREATE TABLE t1 (
+`pk` int(11) NOT NULL AUTO_INCREMENT PRIMARY KEY
+);
+CREATE TABLE t3 (
+`pk` int(11) NOT NULL AUTO_INCREMENT PRIMARY KEY
+);
+INSERT INTO t3 VALUES
+(1),(2),(3),(4),(5),(6),(7),(8),(9),(10),(11),(12),(13),(14),(15),
+(16),(17),(18),(19),(20);
+CREATE TABLE t2 (
+`pk` int(11) NOT NULL AUTO_INCREMENT,
+`int_nokey` int(11) NOT NULL,
+`time_key` time NOT NULL,
+PRIMARY KEY (`pk`),
+KEY `time_key` (`time_key`)
+);
+INSERT INTO t2 VALUES (10,9,'22:36:46'),(11,0,'08:46:46');
+SELECT DISTINCT t1.`pk`
+FROM t1 RIGHT JOIN t2 STRAIGHT_JOIN t3 ON t2.`int_nokey`  ON t2.`time_key`
+GROUP BY 1;
+pk
+NULL
+DROP TABLE IF EXISTS t1, t2, t3;
+#
+# Bug #46328: Use of aggregate function without GROUP BY clause 
+#             returns many rows (vs. one )
+#             
+CREATE TABLE t1 (
+int_key int(11) NOT NULL,
+KEY int_key (int_key)
+);
+INSERT INTO t1 VALUES
+(0),(2),(2),(2),(3),(4),(5),(5),(6),(6),(8),(8),(9),(9);
+CREATE TABLE t2 (
+int_key int(11) NOT NULL,
+KEY int_key (int_key)
+);
+INSERT INTO t2 VALUES (2),(3);
+
+# The query shall return 1 record with a max value 9 and one of the 
+# int_key values inserted above (undefined which one). A changed 
+# execution plan may change the value in the second column
+SELECT  MAX(t1.int_key), t1.int_key
+FROM t1 STRAIGHT_JOIN t2  
+ORDER BY t1.int_key;
+MAX(t1.int_key)	int_key
+9	0
+
+explain 
+SELECT  MAX(t1.int_key), t1.int_key
+FROM t1 STRAIGHT_JOIN t2  
+ORDER BY t1.int_key;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	index	NULL	int_key	4	NULL	14	Using index
+1	SIMPLE	t2	index	NULL	int_key	4	NULL	2	Using index; Using join buffer
+
+DROP TABLE t1,t2;
+SET join_cache_level=default;
+#
+# Regression test for
+# Bug#46733 - NULL value not returned for aggregate on empty result 
+#             set w/ semijoin on
+#
+CREATE TABLE t1 (
+i int(11) NOT NULL,
+v varchar(1) DEFAULT NULL,
+PRIMARY KEY (i)
+);
+INSERT INTO t1 VALUES (10,'a'),(11,'b'),(12,'c'),(13,'d');
+CREATE TABLE t2 (
+i int(11) NOT NULL,
+v varchar(1) DEFAULT NULL,
+PRIMARY KEY (i)
+);
+INSERT INTO t2 VALUES (1,'x'),(2,'y');
+
+SELECT MAX(t1.i) 
+FROM t1 JOIN t2 ON t2.v
+ORDER BY t2.v;
+MAX(t1.i)
+NULL
+
+EXPLAIN
+SELECT MAX(t1.i) 
+FROM t1 JOIN t2 ON t2.v
+ORDER BY t2.v;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	2	Using where
+1	SIMPLE	t1	index	NULL	PRIMARY	4	NULL	4	Using index; Using join buffer
+
+DROP TABLE t1,t2;
+#
+# Bug #45092: join buffer contains two blob columns one of which is
+#             used in the key employed to access the joined table
+#
+CREATE TABLE t1 (c1 int, c2 int, key (c2));
+INSERT INTO t1 VALUES (1,1);
+INSERT INTO t1 VALUES (2,2);
+CREATE TABLE t2 (c1 text, c2 text);
+INSERT INTO t2 VALUES('tt', 'uu');
+INSERT INTO t2 VALUES('zzzz', 'xxxxxxxxx');
+ANALYZE TABLE t1,t2;
+set join_cache_level=6;
+SELECT t1.*, t2.*, LENGTH(t2.c1), LENGTH(t2.c2) FROM t1,t2
+WHERE t1.c2=LENGTH(t2.c2) and t1.c1=LENGTH(t2.c1);
+c1	c2	c1	c2	LENGTH(t2.c1)	LENGTH(t2.c2)
+2	2	tt	uu	2	2
+set join_cache_level=default;
+DROP TABLE t1,t2;

=== added file 'mysql-test/r/join_nested_jcl6.result'
--- a/mysql-test/r/join_nested_jcl6.result	1970-01-01 00:00:00 +0000
+++ b/mysql-test/r/join_nested_jcl6.result	2009-12-21 02:26:15 +0000
@@ -0,0 +1,1856 @@
+set join_cache_level=6;
+show variables like 'join_cache_level';
+Variable_name	Value
+join_cache_level	6
+DROP TABLE IF EXISTS t0,t1,t2,t3,t4,t5,t6,t7,t8,t9;
+CREATE TABLE t0 (a int, b int, c int);
+CREATE TABLE t1 (a int, b int, c int);
+CREATE TABLE t2 (a int, b int, c int);
+CREATE TABLE t3 (a int, b int, c int);
+CREATE TABLE t4 (a int, b int, c int);
+CREATE TABLE t5 (a int, b int, c int);
+CREATE TABLE t6 (a int, b int, c int);
+CREATE TABLE t7 (a int, b int, c int);
+CREATE TABLE t8 (a int, b int, c int);
+CREATE TABLE t9 (a int, b int, c int);
+INSERT INTO t0 VALUES (1,1,0), (1,2,0), (2,2,0);
+INSERT INTO t1 VALUES (1,3,0), (2,2,0), (3,2,0);
+INSERT INTO t2 VALUES (3,3,0), (4,2,0), (5,3,0);
+INSERT INTO t3 VALUES (1,2,0), (2,2,0);
+INSERT INTO t4 VALUES (3,2,0), (4,2,0);
+INSERT INTO t5 VALUES (3,1,0), (2,2,0), (3,3,0);
+INSERT INTO t6 VALUES (3,2,0), (6,2,0), (6,1,0);
+INSERT INTO t7 VALUES (1,1,0), (2,2,0);
+INSERT INTO t8 VALUES (0,2,0), (1,2,0);
+INSERT INTO t9 VALUES (1,1,0), (1,2,0), (3,3,0);
+SELECT t2.a,t2.b
+FROM t2;
+a	b
+3	3
+4	2
+5	3
+SELECT t3.a,t3.b
+FROM t3;
+a	b
+1	2
+2	2
+SELECT t4.a,t4.b
+FROM t4;
+a	b
+3	2
+4	2
+SELECT t3.a,t3.b,t4.a,t4.b
+FROM t3,t4;
+a	b	a	b
+1	2	3	2
+2	2	3	2
+1	2	4	2
+2	2	4	2
+SELECT t2.a,t2.b,t3.a,t3.b,t4.a,t4.b
+FROM t2
+LEFT JOIN              
+(t3, t4)
+ON t2.b=t4.b;
+a	b	a	b	a	b
+4	2	1	2	3	2
+4	2	2	2	3	2
+4	2	1	2	4	2
+4	2	2	2	4	2
+3	3	NULL	NULL	NULL	NULL
+5	3	NULL	NULL	NULL	NULL
+SELECT t2.a,t2.b,t3.a,t3.b,t4.a,t4.b
+FROM t2
+LEFT JOIN              
+(t3, t4)
+ON t3.a=1 AND t2.b=t4.b;
+a	b	a	b	a	b
+4	2	1	2	3	2
+4	2	1	2	4	2
+3	3	NULL	NULL	NULL	NULL
+5	3	NULL	NULL	NULL	NULL
+EXPLAIN EXTENDED
+SELECT t2.a,t2.b,t3.a,t3.b,t4.a,t4.b
+FROM t2
+LEFT JOIN              
+(t3, t4)
+ON t2.b=t4.b
+WHERE t3.a=1 OR t3.c IS NULL;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	3	100.00	
+1	SIMPLE	t3	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where; Using join buffer
+1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where; Using join buffer
+Warnings:
+Note	1003	select `test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b`,`test`.`t3`.`a` AS `a`,`test`.`t3`.`b` AS `b`,`test`.`t4`.`a` AS `a`,`test`.`t4`.`b` AS `b` from `test`.`t2` left join (`test`.`t3` join `test`.`t4`) on((`test`.`t4`.`b` = `test`.`t2`.`b`)) where ((`test`.`t3`.`a` = 1) or isnull(`test`.`t3`.`c`))
+SELECT t2.a,t2.b,t3.a,t3.b,t4.a,t4.b
+FROM t2
+LEFT JOIN              
+(t3, t4)
+ON t2.b=t4.b
+WHERE t3.a=1 OR t3.c IS NULL;
+a	b	a	b	a	b
+4	2	1	2	3	2
+4	2	1	2	4	2
+3	3	NULL	NULL	NULL	NULL
+5	3	NULL	NULL	NULL	NULL
+SELECT t2.a,t2.b,t3.a,t3.b,t4.a,t4.b
+FROM t2
+LEFT JOIN              
+(t3, t4)
+ON t2.b=t4.b
+WHERE t3.a>1 OR t3.c IS NULL;
+a	b	a	b	a	b
+4	2	2	2	3	2
+4	2	2	2	4	2
+3	3	NULL	NULL	NULL	NULL
+5	3	NULL	NULL	NULL	NULL
+SELECT t5.a,t5.b
+FROM t5;
+a	b
+3	1
+2	2
+3	3
+SELECT t3.a,t3.b,t4.a,t4.b,t5.a,t5.b
+FROM t3,t4,t5;
+a	b	a	b	a	b
+1	2	3	2	3	1
+2	2	3	2	3	1
+1	2	4	2	3	1
+2	2	4	2	3	1
+1	2	3	2	2	2
+2	2	3	2	2	2
+1	2	4	2	2	2
+2	2	4	2	2	2
+1	2	3	2	3	3
+2	2	3	2	3	3
+1	2	4	2	3	3
+2	2	4	2	3	3
+SELECT t2.a,t2.b,t3.a,t3.b,t4.a,t4.b,t5.a,t5.b
+FROM t2
+LEFT JOIN              
+(t3, t4, t5)
+ON t2.b=t4.b;
+a	b	a	b	a	b	a	b
+4	2	1	2	3	2	3	1
+4	2	2	2	3	2	3	1
+4	2	1	2	4	2	3	1
+4	2	2	2	4	2	3	1
+4	2	1	2	3	2	2	2
+4	2	2	2	3	2	2	2
+4	2	1	2	4	2	2	2
+4	2	2	2	4	2	2	2
+4	2	1	2	3	2	3	3
+4	2	2	2	3	2	3	3
+4	2	1	2	4	2	3	3
+4	2	2	2	4	2	3	3
+3	3	NULL	NULL	NULL	NULL	NULL	NULL
+5	3	NULL	NULL	NULL	NULL	NULL	NULL
+EXPLAIN EXTENDED
+SELECT t2.a,t2.b,t3.a,t3.b,t4.a,t4.b,t5.a,t5.b
+FROM t2
+LEFT JOIN              
+(t3, t4, t5)
+ON t2.b=t4.b
+WHERE t3.a>1 OR t3.c IS NULL;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	3	100.00	
+1	SIMPLE	t3	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where; Using join buffer
+1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where; Using join buffer
+1	SIMPLE	t5	ALL	NULL	NULL	NULL	NULL	3	100.00	Using join buffer
+Warnings:
+Note	1003	select `test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b`,`test`.`t3`.`a` AS `a`,`test`.`t3`.`b` AS `b`,`test`.`t4`.`a` AS `a`,`test`.`t4`.`b` AS `b`,`test`.`t5`.`a` AS `a`,`test`.`t5`.`b` AS `b` from `test`.`t2` left join (`test`.`t3` join `test`.`t4` join `test`.`t5`) on((`test`.`t4`.`b` = `test`.`t2`.`b`)) where ((`test`.`t3`.`a` > 1) or isnull(`test`.`t3`.`c`))
+SELECT t2.a,t2.b,t3.a,t3.b,t4.a,t4.b,t5.a,t5.b
+FROM t2
+LEFT JOIN              
+(t3, t4, t5)
+ON t2.b=t4.b
+WHERE t3.a>1 OR t3.c IS NULL;
+a	b	a	b	a	b	a	b
+4	2	2	2	3	2	3	1
+4	2	2	2	4	2	3	1
+4	2	2	2	3	2	2	2
+4	2	2	2	4	2	2	2
+4	2	2	2	3	2	3	3
+4	2	2	2	4	2	3	3
+3	3	NULL	NULL	NULL	NULL	NULL	NULL
+5	3	NULL	NULL	NULL	NULL	NULL	NULL
+EXPLAIN EXTENDED
+SELECT t2.a,t2.b,t3.a,t3.b,t4.a,t4.b,t5.a,t5.b
+FROM t2
+LEFT JOIN              
+(t3, t4, t5)
+ON t2.b=t4.b
+WHERE (t3.a>1 OR t3.c IS NULL) AND 
+(t5.a<3 OR t5.c IS NULL);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	3	100.00	
+1	SIMPLE	t3	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where; Using join buffer
+1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where; Using join buffer
+1	SIMPLE	t5	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where; Using join buffer
+Warnings:
+Note	1003	select `test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b`,`test`.`t3`.`a` AS `a`,`test`.`t3`.`b` AS `b`,`test`.`t4`.`a` AS `a`,`test`.`t4`.`b` AS `b`,`test`.`t5`.`a` AS `a`,`test`.`t5`.`b` AS `b` from `test`.`t2` left join (`test`.`t3` join `test`.`t4` join `test`.`t5`) on((`test`.`t4`.`b` = `test`.`t2`.`b`)) where (((`test`.`t3`.`a` > 1) or isnull(`test`.`t3`.`c`)) and ((`test`.`t5`.`a` < 3) or isnull(`test`.`t5`.`c`)))
+SELECT t2.a,t2.b,t3.a,t3.b,t4.a,t4.b,t5.a,t5.b
+FROM t2
+LEFT JOIN              
+(t3, t4, t5)
+ON t2.b=t4.b
+WHERE (t3.a>1 OR t3.c IS NULL) AND 
+(t5.a<3 OR t5.c IS NULL);
+a	b	a	b	a	b	a	b
+4	2	2	2	3	2	2	2
+4	2	2	2	4	2	2	2
+3	3	NULL	NULL	NULL	NULL	NULL	NULL
+5	3	NULL	NULL	NULL	NULL	NULL	NULL
+SELECT t6.a,t6.b
+FROM t6;
+a	b
+3	2
+6	2
+6	1
+SELECT t7.a,t7.b
+FROM t7;
+a	b
+1	1
+2	2
+SELECT t6.a,t6.b,t7.a,t7.b
+FROM t6,t7;
+a	b	a	b
+3	2	1	1
+3	2	2	2
+6	2	1	1
+6	2	2	2
+6	1	1	1
+6	1	2	2
+SELECT t8.a,t8.b
+FROM t8;
+a	b
+0	2
+1	2
+EXPLAIN EXTENDED
+SELECT t6.a,t6.b,t7.a,t7.b,t8.a,t8.b
+FROM (t6, t7)
+LEFT JOIN 
+t8
+ON t7.b=t8.b AND t6.b < 10;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	SIMPLE	t7	ALL	NULL	NULL	NULL	NULL	2	100.00	
+1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	3	100.00	Using join buffer
+1	SIMPLE	t8	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where; Using join buffer
+Warnings:
+Note	1003	select `test`.`t6`.`a` AS `a`,`test`.`t6`.`b` AS `b`,`test`.`t7`.`a` AS `a`,`test`.`t7`.`b` AS `b`,`test`.`t8`.`a` AS `a`,`test`.`t8`.`b` AS `b` from `test`.`t6` join `test`.`t7` left join `test`.`t8` on(((`test`.`t7`.`b` = `test`.`t8`.`b`) and (`test`.`t6`.`b` < 10))) where 1
+SELECT t6.a,t6.b,t7.a,t7.b,t8.a,t8.b
+FROM (t6, t7)
+LEFT JOIN 
+t8
+ON t7.b=t8.b AND t6.b < 10;
+a	b	a	b	a	b
+3	2	2	2	0	2
+6	2	2	2	0	2
+6	1	2	2	0	2
+3	2	2	2	1	2
+6	2	2	2	1	2
+6	1	2	2	1	2
+3	2	1	1	NULL	NULL
+6	2	1	1	NULL	NULL
+6	1	1	1	NULL	NULL
+SELECT t5.a,t5.b
+FROM t5;
+a	b
+3	1
+2	2
+3	3
+SELECT t5.a,t5.b,t6.a,t6.b,t7.a,t7.b,t8.a,t8.b
+FROM t5 
+LEFT JOIN 
+( 
+(t6, t7)
+LEFT JOIN 
+t8
+ON t7.b=t8.b AND t6.b < 10
+)
+ON t6.b >= 2 AND t5.b=t7.b;
+a	b	a	b	a	b	a	b
+2	2	3	2	2	2	0	2
+2	2	6	2	2	2	0	2
+2	2	3	2	2	2	1	2
+2	2	6	2	2	2	1	2
+3	1	3	2	1	1	NULL	NULL
+3	1	6	2	1	1	NULL	NULL
+3	3	NULL	NULL	NULL	NULL	NULL	NULL
+SELECT t5.a,t5.b,t6.a,t6.b,t7.a,t7.b,t8.a,t8.b
+FROM t5 
+LEFT JOIN 
+( 
+(t6, t7)
+LEFT JOIN 
+t8
+ON t7.b=t8.b AND t6.b < 10
+)
+ON t6.b >= 2 AND t5.b=t7.b AND
+(t8.a < 1 OR t8.c IS NULL);
+a	b	a	b	a	b	a	b
+2	2	3	2	2	2	0	2
+2	2	6	2	2	2	0	2
+3	1	3	2	1	1	NULL	NULL
+3	1	6	2	1	1	NULL	NULL
+3	3	NULL	NULL	NULL	NULL	NULL	NULL
+SELECT t2.a,t2.b,t3.a,t3.b,t4.a,t4.b
+FROM t2
+LEFT JOIN              
+(t3, t4)
+ON t3.a=1 AND t2.b=t4.b;
+a	b	a	b	a	b
+4	2	1	2	3	2
+4	2	1	2	4	2
+3	3	NULL	NULL	NULL	NULL
+5	3	NULL	NULL	NULL	NULL
+SELECT t2.a,t2.b,t3.a,t3.b,t4.a,t4.b,
+t5.a,t5.b,t6.a,t6.b,t7.a,t7.b,t8.a,t8.b
+FROM t2
+LEFT JOIN              
+(t3, t4)
+ON t3.a=1 AND t2.b=t4.b,
+t5 
+LEFT JOIN 
+( 
+(t6, t7)
+LEFT JOIN 
+t8
+ON t7.b=t8.b AND t6.b < 10
+)
+ON t6.b >= 2 AND t5.b=t7.b;
+a	b	a	b	a	b	a	b	a	b	a	b	a	b
+4	2	1	2	3	2	2	2	3	2	2	2	0	2
+4	2	1	2	4	2	2	2	3	2	2	2	0	2
+4	2	1	2	3	2	2	2	6	2	2	2	0	2
+4	2	1	2	4	2	2	2	6	2	2	2	0	2
+4	2	1	2	3	2	2	2	3	2	2	2	1	2
+4	2	1	2	4	2	2	2	3	2	2	2	1	2
+4	2	1	2	3	2	2	2	6	2	2	2	1	2
+4	2	1	2	4	2	2	2	6	2	2	2	1	2
+4	2	1	2	3	2	3	1	3	2	1	1	NULL	NULL
+4	2	1	2	4	2	3	1	3	2	1	1	NULL	NULL
+4	2	1	2	3	2	3	1	6	2	1	1	NULL	NULL
+4	2	1	2	4	2	3	1	6	2	1	1	NULL	NULL
+4	2	1	2	3	2	3	3	NULL	NULL	NULL	NULL	NULL	NULL
+4	2	1	2	4	2	3	3	NULL	NULL	NULL	NULL	NULL	NULL
+3	3	NULL	NULL	NULL	NULL	2	2	3	2	2	2	0	2
+5	3	NULL	NULL	NULL	NULL	2	2	3	2	2	2	0	2
+3	3	NULL	NULL	NULL	NULL	2	2	6	2	2	2	0	2
+5	3	NULL	NULL	NULL	NULL	2	2	6	2	2	2	0	2
+3	3	NULL	NULL	NULL	NULL	2	2	3	2	2	2	1	2
+5	3	NULL	NULL	NULL	NULL	2	2	3	2	2	2	1	2
+3	3	NULL	NULL	NULL	NULL	2	2	6	2	2	2	1	2
+5	3	NULL	NULL	NULL	NULL	2	2	6	2	2	2	1	2
+3	3	NULL	NULL	NULL	NULL	3	1	3	2	1	1	NULL	NULL
+5	3	NULL	NULL	NULL	NULL	3	1	3	2	1	1	NULL	NULL
+3	3	NULL	NULL	NULL	NULL	3	1	6	2	1	1	NULL	NULL
+5	3	NULL	NULL	NULL	NULL	3	1	6	2	1	1	NULL	NULL
+3	3	NULL	NULL	NULL	NULL	3	3	NULL	NULL	NULL	NULL	NULL	NULL
+5	3	NULL	NULL	NULL	NULL	3	3	NULL	NULL	NULL	NULL	NULL	NULL
+SELECT t2.a,t2.b,t3.a,t3.b,t4.a,t4.b,
+t5.a,t5.b,t6.a,t6.b,t7.a,t7.b,t8.a,t8.b
+FROM t2
+LEFT JOIN              
+(t3, t4)
+ON t3.a=1 AND t2.b=t4.b,
+t5 
+LEFT JOIN 
+( 
+(t6, t7)
+LEFT JOIN 
+t8
+ON t7.b=t8.b AND t6.b < 10
+)
+ON t6.b >= 2 AND t5.b=t7.b
+WHERE t2.a > 3 AND
+(t6.a < 6 OR t6.c IS NULL);
+a	b	a	b	a	b	a	b	a	b	a	b	a	b
+4	2	1	2	3	2	2	2	3	2	2	2	0	2
+4	2	1	2	4	2	2	2	3	2	2	2	0	2
+4	2	1	2	3	2	2	2	3	2	2	2	1	2
+4	2	1	2	4	2	2	2	3	2	2	2	1	2
+4	2	1	2	3	2	3	1	3	2	1	1	NULL	NULL
+4	2	1	2	4	2	3	1	3	2	1	1	NULL	NULL
+4	2	1	2	3	2	3	3	NULL	NULL	NULL	NULL	NULL	NULL
+4	2	1	2	4	2	3	3	NULL	NULL	NULL	NULL	NULL	NULL
+5	3	NULL	NULL	NULL	NULL	2	2	3	2	2	2	0	2
+5	3	NULL	NULL	NULL	NULL	2	2	3	2	2	2	1	2
+5	3	NULL	NULL	NULL	NULL	3	1	3	2	1	1	NULL	NULL
+5	3	NULL	NULL	NULL	NULL	3	3	NULL	NULL	NULL	NULL	NULL	NULL
+SELECT t1.a,t1.b
+FROM t1;
+a	b
+1	3
+2	2
+3	2
+SELECT t1.a,t1.b,t2.a,t2.b,t3.a,t3.b,t4.a,t4.b,
+t5.a,t5.b,t6.a,t6.b,t7.a,t7.b,t8.a,t8.b
+FROM t1
+LEFT JOIN                
+( 
+t2
+LEFT JOIN              
+(t3, t4)
+ON t3.a=1 AND t2.b=t4.b,
+t5 
+LEFT JOIN 
+( 
+(t6, t7)
+LEFT JOIN 
+t8
+ON t7.b=t8.b AND t6.b < 10
+)
+ON t6.b >= 2 AND t5.b=t7.b 
+)
+ON (t3.b=2 OR t3.c IS NULL) AND (t6.b=2 OR t6.c IS NULL) AND
+(t1.b=t5.b OR t3.c IS NULL OR t6.c IS NULL or t8.c IS NULL) AND
+(t1.a != 2);
+a	b	a	b	a	b	a	b	a	b	a	b	a	b	a	b
+3	2	4	2	1	2	3	2	2	2	3	2	2	2	0	2
+3	2	4	2	1	2	4	2	2	2	3	2	2	2	0	2
+3	2	4	2	1	2	3	2	2	2	6	2	2	2	0	2
+3	2	4	2	1	2	4	2	2	2	6	2	2	2	0	2
+3	2	4	2	1	2	3	2	2	2	3	2	2	2	1	2
+3	2	4	2	1	2	4	2	2	2	3	2	2	2	1	2
+3	2	4	2	1	2	3	2	2	2	6	2	2	2	1	2
+3	2	4	2	1	2	4	2	2	2	6	2	2	2	1	2
+1	3	4	2	1	2	3	2	3	1	3	2	1	1	NULL	NULL
+3	2	4	2	1	2	3	2	3	1	3	2	1	1	NULL	NULL
+1	3	4	2	1	2	4	2	3	1	3	2	1	1	NULL	NULL
+3	2	4	2	1	2	4	2	3	1	3	2	1	1	NULL	NULL
+1	3	4	2	1	2	3	2	3	1	6	2	1	1	NULL	NULL
+3	2	4	2	1	2	3	2	3	1	6	2	1	1	NULL	NULL
+1	3	4	2	1	2	4	2	3	1	6	2	1	1	NULL	NULL
+3	2	4	2	1	2	4	2	3	1	6	2	1	1	NULL	NULL
+1	3	4	2	1	2	3	2	3	3	NULL	NULL	NULL	NULL	NULL	NULL
+3	2	4	2	1	2	3	2	3	3	NULL	NULL	NULL	NULL	NULL	NULL
+1	3	4	2	1	2	4	2	3	3	NULL	NULL	NULL	NULL	NULL	NULL
+3	2	4	2	1	2	4	2	3	3	NULL	NULL	NULL	NULL	NULL	NULL
+1	3	3	3	NULL	NULL	NULL	NULL	2	2	3	2	2	2	0	2
+3	2	3	3	NULL	NULL	NULL	NULL	2	2	3	2	2	2	0	2
+1	3	5	3	NULL	NULL	NULL	NULL	2	2	3	2	2	2	0	2
+3	2	5	3	NULL	NULL	NULL	NULL	2	2	3	2	2	2	0	2
+1	3	3	3	NULL	NULL	NULL	NULL	2	2	6	2	2	2	0	2
+3	2	3	3	NULL	NULL	NULL	NULL	2	2	6	2	2	2	0	2
+1	3	5	3	NULL	NULL	NULL	NULL	2	2	6	2	2	2	0	2
+3	2	5	3	NULL	NULL	NULL	NULL	2	2	6	2	2	2	0	2
+1	3	3	3	NULL	NULL	NULL	NULL	2	2	3	2	2	2	1	2
+3	2	3	3	NULL	NULL	NULL	NULL	2	2	3	2	2	2	1	2
+1	3	5	3	NULL	NULL	NULL	NULL	2	2	3	2	2	2	1	2
+3	2	5	3	NULL	NULL	NULL	NULL	2	2	3	2	2	2	1	2
+1	3	3	3	NULL	NULL	NULL	NULL	2	2	6	2	2	2	1	2
+3	2	3	3	NULL	NULL	NULL	NULL	2	2	6	2	2	2	1	2
+1	3	5	3	NULL	NULL	NULL	NULL	2	2	6	2	2	2	1	2
+3	2	5	3	NULL	NULL	NULL	NULL	2	2	6	2	2	2	1	2
+1	3	3	3	NULL	NULL	NULL	NULL	3	1	3	2	1	1	NULL	NULL
+3	2	3	3	NULL	NULL	NULL	NULL	3	1	3	2	1	1	NULL	NULL
+1	3	5	3	NULL	NULL	NULL	NULL	3	1	3	2	1	1	NULL	NULL
+3	2	5	3	NULL	NULL	NULL	NULL	3	1	3	2	1	1	NULL	NULL
+1	3	3	3	NULL	NULL	NULL	NULL	3	1	6	2	1	1	NULL	NULL
+3	2	3	3	NULL	NULL	NULL	NULL	3	1	6	2	1	1	NULL	NULL
+1	3	5	3	NULL	NULL	NULL	NULL	3	1	6	2	1	1	NULL	NULL
+3	2	5	3	NULL	NULL	NULL	NULL	3	1	6	2	1	1	NULL	NULL
+1	3	3	3	NULL	NULL	NULL	NULL	3	3	NULL	NULL	NULL	NULL	NULL	NULL
+3	2	3	3	NULL	NULL	NULL	NULL	3	3	NULL	NULL	NULL	NULL	NULL	NULL
+1	3	5	3	NULL	NULL	NULL	NULL	3	3	NULL	NULL	NULL	NULL	NULL	NULL
+3	2	5	3	NULL	NULL	NULL	NULL	3	3	NULL	NULL	NULL	NULL	NULL	NULL
+2	2	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL
+SELECT t1.a,t1.b,t2.a,t2.b,t3.a,t3.b,t4.a,t4.b,
+t5.a,t5.b,t6.a,t6.b,t7.a,t7.b,t8.a,t8.b
+FROM t1
+LEFT JOIN                
+( 
+t2
+LEFT JOIN              
+(t3, t4)
+ON t3.a=1 AND t2.b=t4.b,
+t5 
+LEFT JOIN 
+( 
+(t6, t7)
+LEFT JOIN 
+t8
+ON t7.b=t8.b AND t6.b < 10
+)
+ON t6.b >= 2 AND t5.b=t7.b 
+)
+ON (t3.b=2 OR t3.c IS NULL) AND (t6.b=2 OR t6.c IS NULL) AND
+(t1.b=t5.b OR t3.c IS NULL OR t6.c IS NULL or t8.c IS NULL) AND
+(t1.a != 2)
+WHERE (t2.a >= 4 OR t2.c IS NULL);
+a	b	a	b	a	b	a	b	a	b	a	b	a	b	a	b
+3	2	4	2	1	2	3	2	2	2	3	2	2	2	0	2
+3	2	4	2	1	2	4	2	2	2	3	2	2	2	0	2
+3	2	4	2	1	2	3	2	2	2	6	2	2	2	0	2
+3	2	4	2	1	2	4	2	2	2	6	2	2	2	0	2
+3	2	4	2	1	2	3	2	2	2	3	2	2	2	1	2
+3	2	4	2	1	2	4	2	2	2	3	2	2	2	1	2
+3	2	4	2	1	2	3	2	2	2	6	2	2	2	1	2
+3	2	4	2	1	2	4	2	2	2	6	2	2	2	1	2
+1	3	4	2	1	2	3	2	3	1	3	2	1	1	NULL	NULL
+3	2	4	2	1	2	3	2	3	1	3	2	1	1	NULL	NULL
+1	3	4	2	1	2	4	2	3	1	3	2	1	1	NULL	NULL
+3	2	4	2	1	2	4	2	3	1	3	2	1	1	NULL	NULL
+1	3	4	2	1	2	3	2	3	1	6	2	1	1	NULL	NULL
+3	2	4	2	1	2	3	2	3	1	6	2	1	1	NULL	NULL
+1	3	4	2	1	2	4	2	3	1	6	2	1	1	NULL	NULL
+3	2	4	2	1	2	4	2	3	1	6	2	1	1	NULL	NULL
+1	3	4	2	1	2	3	2	3	3	NULL	NULL	NULL	NULL	NULL	NULL
+3	2	4	2	1	2	3	2	3	3	NULL	NULL	NULL	NULL	NULL	NULL
+1	3	4	2	1	2	4	2	3	3	NULL	NULL	NULL	NULL	NULL	NULL
+3	2	4	2	1	2	4	2	3	3	NULL	NULL	NULL	NULL	NULL	NULL
+1	3	5	3	NULL	NULL	NULL	NULL	2	2	3	2	2	2	0	2
+3	2	5	3	NULL	NULL	NULL	NULL	2	2	3	2	2	2	0	2
+1	3	5	3	NULL	NULL	NULL	NULL	2	2	6	2	2	2	0	2
+3	2	5	3	NULL	NULL	NULL	NULL	2	2	6	2	2	2	0	2
+1	3	5	3	NULL	NULL	NULL	NULL	2	2	3	2	2	2	1	2
+3	2	5	3	NULL	NULL	NULL	NULL	2	2	3	2	2	2	1	2
+1	3	5	3	NULL	NULL	NULL	NULL	2	2	6	2	2	2	1	2
+3	2	5	3	NULL	NULL	NULL	NULL	2	2	6	2	2	2	1	2
+1	3	5	3	NULL	NULL	NULL	NULL	3	1	3	2	1	1	NULL	NULL
+3	2	5	3	NULL	NULL	NULL	NULL	3	1	3	2	1	1	NULL	NULL
+1	3	5	3	NULL	NULL	NULL	NULL	3	1	6	2	1	1	NULL	NULL
+3	2	5	3	NULL	NULL	NULL	NULL	3	1	6	2	1	1	NULL	NULL
+1	3	5	3	NULL	NULL	NULL	NULL	3	3	NULL	NULL	NULL	NULL	NULL	NULL
+3	2	5	3	NULL	NULL	NULL	NULL	3	3	NULL	NULL	NULL	NULL	NULL	NULL
+2	2	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL
+SELECT t0.a,t0.b
+FROM t0;
+a	b
+1	1
+1	2
+2	2
+EXPLAIN EXTENDED
+SELECT t0.a,t0.b,t1.a,t1.b,t2.a,t2.b,t3.a,t3.b,t4.a,t4.b,
+t5.a,t5.b,t6.a,t6.b,t7.a,t7.b,t8.a,t8.b
+FROM t0,t1
+LEFT JOIN                
+( 
+t2
+LEFT JOIN              
+(t3, t4)
+ON t3.a=1 AND t2.b=t4.b,
+t5 
+LEFT JOIN 
+( 
+(t6, t7)
+LEFT JOIN 
+t8
+ON t7.b=t8.b AND t6.b < 10
+)
+ON t6.b >= 2 AND t5.b=t7.b 
+)
+ON (t3.b=2 OR t3.c IS NULL) AND (t6.b=2 OR t6.c IS NULL) AND
+(t1.b=t5.b OR t3.c IS NULL OR t6.c IS NULL or t8.c IS NULL) AND
+(t1.a != 2)
+WHERE t0.a=1 AND
+t0.b=t1.b AND          
+(t2.a >= 4 OR t2.c IS NULL);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	SIMPLE	t0	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where; Using join buffer
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where; Using join buffer
+1	SIMPLE	t3	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where; Using join buffer
+1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where; Using join buffer
+1	SIMPLE	t5	ALL	NULL	NULL	NULL	NULL	3	100.00	Using join buffer
+1	SIMPLE	t7	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where; Using join buffer
+1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where; Using join buffer
+1	SIMPLE	t8	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where; Using join buffer
+Warnings:
+Note	1003	select `test`.`t0`.`a` AS `a`,`test`.`t0`.`b` AS `b`,`test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b`,`test`.`t3`.`a` AS `a`,`test`.`t3`.`b` AS `b`,`test`.`t4`.`a` AS `a`,`test`.`t4`.`b` AS `b`,`test`.`t5`.`a` AS `a`,`test`.`t5`.`b` AS `b`,`test`.`t6`.`a` AS `a`,`test`.`t6`.`b` AS `b`,`test`.`t7`.`a` AS `a`,`test`.`t7`.`b` AS `b`,`test`.`t8`.`a` AS `a`,`test`.`t8`.`b` AS `b` from `test`.`t0` join `test`.`t1` left join (`test`.`t2` left join (`test`.`t3` join `test`.`t4`) on(((`test`.`t4`.`b` = `test`.`t2`.`b`) and (`test`.`t3`.`a` = 1))) join `test`.`t5` left join (`test`.`t6` join `test`.`t7` left join `test`.`t8` on(((`test`.`t8`.`b` = `test`.`t5`.`b`) and (`test`.`t6`.`b` < 10)))) on(((`test`.`t7`.`b` = `test`.`t5`.`b`) and (`test`.`t6`.`b` >= 2)))) on((((`test`.`t3`.`b` = 2) or isnull(`test`.`t3`.`c`)) and ((`test`.`t6`.`b` = 2) or isnull(`test`.`t6`.`c`)) and ((`test`.`t5`.`b` = `test`.`t0`.`b`) or isnull(`test`.`t3`.`c`) or isnull(`test`.`t6`.`c`) or isnull(`test`.`t8`.`c`)) and (`test`.`t1`.`a` <> 2))) where ((`test`.`t1`.`b` = `test`.`t0`.`b`) and (`test`.`t0`.`a` = 1) and ((`test`.`t2`.`a` >= 4) or isnull(`test`.`t2`.`c`)))
+SELECT t0.a,t0.b,t1.a,t1.b,t2.a,t2.b,t3.a,t3.b,t4.a,t4.b,
+t5.a,t5.b,t6.a,t6.b,t7.a,t7.b,t8.a,t8.b
+FROM t0,t1
+LEFT JOIN                
+( 
+t2
+LEFT JOIN              
+(t3, t4)
+ON t3.a=1 AND t2.b=t4.b,
+t5 
+LEFT JOIN 
+( 
+(t6, t7)
+LEFT JOIN 
+t8
+ON t7.b=t8.b AND t6.b < 10
+)
+ON t6.b >= 2 AND t5.b=t7.b 
+)
+ON (t3.b=2 OR t3.c IS NULL) AND (t6.b=2 OR t6.c IS NULL) AND
+(t1.b=t5.b OR t3.c IS NULL OR t6.c IS NULL or t8.c IS NULL) AND
+(t1.a != 2)
+WHERE t0.a=1 AND
+t0.b=t1.b AND          
+(t2.a >= 4 OR t2.c IS NULL);
+a	b	a	b	a	b	a	b	a	b	a	b	a	b	a	b	a	b
+1	2	3	2	4	2	1	2	3	2	2	2	3	2	2	2	0	2
+1	2	3	2	4	2	1	2	4	2	2	2	3	2	2	2	0	2
+1	2	3	2	4	2	1	2	3	2	2	2	6	2	2	2	0	2
+1	2	3	2	4	2	1	2	4	2	2	2	6	2	2	2	0	2
+1	2	3	2	4	2	1	2	3	2	2	2	3	2	2	2	1	2
+1	2	3	2	4	2	1	2	4	2	2	2	3	2	2	2	1	2
+1	2	3	2	4	2	1	2	3	2	2	2	6	2	2	2	1	2
+1	2	3	2	4	2	1	2	4	2	2	2	6	2	2	2	1	2
+1	2	3	2	4	2	1	2	3	2	3	1	3	2	1	1	NULL	NULL
+1	2	3	2	4	2	1	2	4	2	3	1	3	2	1	1	NULL	NULL
+1	2	3	2	4	2	1	2	3	2	3	1	6	2	1	1	NULL	NULL
+1	2	3	2	4	2	1	2	4	2	3	1	6	2	1	1	NULL	NULL
+1	2	3	2	4	2	1	2	3	2	3	3	NULL	NULL	NULL	NULL	NULL	NULL
+1	2	3	2	4	2	1	2	4	2	3	3	NULL	NULL	NULL	NULL	NULL	NULL
+1	2	3	2	5	3	NULL	NULL	NULL	NULL	2	2	3	2	2	2	0	2
+1	2	3	2	5	3	NULL	NULL	NULL	NULL	2	2	6	2	2	2	0	2
+1	2	3	2	5	3	NULL	NULL	NULL	NULL	2	2	3	2	2	2	1	2
+1	2	3	2	5	3	NULL	NULL	NULL	NULL	2	2	6	2	2	2	1	2
+1	2	3	2	5	3	NULL	NULL	NULL	NULL	3	1	3	2	1	1	NULL	NULL
+1	2	3	2	5	3	NULL	NULL	NULL	NULL	3	1	6	2	1	1	NULL	NULL
+1	2	3	2	5	3	NULL	NULL	NULL	NULL	3	3	NULL	NULL	NULL	NULL	NULL	NULL
+1	2	2	2	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL
+EXPLAIN EXTENDED
+SELECT t0.a,t0.b,t1.a,t1.b,t2.a,t2.b,t3.a,t3.b,t4.a,t4.b,
+t5.a,t5.b,t6.a,t6.b,t7.a,t7.b,t8.a,t8.b,t9.a,t9.b
+FROM t0,t1
+LEFT JOIN                
+( 
+t2
+LEFT JOIN              
+(t3, t4)
+ON t3.a=1 AND t2.b=t4.b,
+t5 
+LEFT JOIN 
+( 
+(t6, t7)
+LEFT JOIN 
+t8
+ON t7.b=t8.b AND t6.b < 10
+)
+ON t6.b >= 2 AND t5.b=t7.b 
+)
+ON (t3.b=2 OR t3.c IS NULL) AND (t6.b=2 OR t6.c IS NULL) AND
+(t1.b=t5.b OR t3.c IS NULL OR t6.c IS NULL or t8.c IS NULL) AND
+(t1.a != 2),
+t9
+WHERE t0.a=1 AND
+t0.b=t1.b AND          
+(t2.a >= 4 OR t2.c IS NULL) AND
+(t3.a < 5 OR t3.c IS NULL) AND
+(t3.b=t4.b OR t3.c IS NULL OR t4.c IS NULL) AND
+(t5.a >=2 OR t5.c IS NULL) AND
+(t6.a >=4 OR t6.c IS NULL) AND
+(t7.a <= 2 OR t7.c IS NULL) AND
+(t8.a < 1 OR t8.c IS NULL) AND
+(t8.b=t9.b OR t8.c IS NULL) AND
+(t9.a=1);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	SIMPLE	t0	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where; Using join buffer
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where; Using join buffer
+1	SIMPLE	t3	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where; Using join buffer
+1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where; Using join buffer
+1	SIMPLE	t5	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where; Using join buffer
+1	SIMPLE	t7	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where; Using join buffer
+1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where; Using join buffer
+1	SIMPLE	t8	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where; Using join buffer
+1	SIMPLE	t9	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where; Using join buffer
+Warnings:
+Note	1003	select `test`.`t0`.`a` AS `a`,`test`.`t0`.`b` AS `b`,`test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b`,`test`.`t3`.`a` AS `a`,`test`.`t3`.`b` AS `b`,`test`.`t4`.`a` AS `a`,`test`.`t4`.`b` AS `b`,`test`.`t5`.`a` AS `a`,`test`.`t5`.`b` AS `b`,`test`.`t6`.`a` AS `a`,`test`.`t6`.`b` AS `b`,`test`.`t7`.`a` AS `a`,`test`.`t7`.`b` AS `b`,`test`.`t8`.`a` AS `a`,`test`.`t8`.`b` AS `b`,`test`.`t9`.`a` AS `a`,`test`.`t9`.`b` AS `b` from `test`.`t0` join `test`.`t1` left join (`test`.`t2` left join (`test`.`t3` join `test`.`t4`) on(((`test`.`t4`.`b` = `test`.`t2`.`b`) and (`test`.`t3`.`a` = 1))) join `test`.`t5` left join (`test`.`t6` join `test`.`t7` left join `test`.`t8` on(((`test`.`t8`.`b` = `test`.`t5`.`b`) and (`test`.`t6`.`b` < 10)))) on(((`test`.`t7`.`b` = `test`.`t5`.`b`) and (`test`.`t6`.`b` >= 2)))) on((((`test`.`t3`.`b` = 2) or isnull(`test`.`t3`.`c`)) and ((`test`.`t6`.`b` = 2) or isnull(`test`.`t6`.`c`)) and ((`test`.`t5`.`b` = `test`.`t0`.`b`) or isnull(`test`.`t3`.`c`) or isnull(`test`.`t6`.`c`) or isnull(`test`.`t8`.`c`)) and (`test`.`t1`.`a` <> 2))) join `test`.`t9` where ((`test`.`t9`.`a` = 1) and (`test`.`t1`.`b` = `test`.`t0`.`b`) and (`test`.`t0`.`a` = 1) and ((`test`.`t2`.`a` >= 4) or isnull(`test`.`t2`.`c`)) and ((`test`.`t3`.`a` < 5) or isnull(`test`.`t3`.`c`)) and ((`test`.`t4`.`b` = `test`.`t3`.`b`) or isnull(`test`.`t3`.`c`) or isnull(`test`.`t4`.`c`)) and ((`test`.`t5`.`a` >= 2) or isnull(`test`.`t5`.`c`)) and ((`test`.`t6`.`a` >= 4) or isnull(`test`.`t6`.`c`)) and ((`test`.`t7`.`a` <= 2) or isnull(`test`.`t7`.`c`)) and ((`test`.`t8`.`a` < 1) or isnull(`test`.`t8`.`c`)) and ((`test`.`t9`.`b` = `test`.`t8`.`b`) or isnull(`test`.`t8`.`c`)))
+SELECT t9.a,t9.b
+FROM t9;
+a	b
+1	1
+1	2
+3	3
+SELECT t0.a,t0.b,t1.a,t1.b,t2.a,t2.b,t3.a,t3.b,t4.a,t4.b,
+t5.a,t5.b,t6.a,t6.b,t7.a,t7.b,t8.a,t8.b,t9.a,t9.b
+FROM t0,t1
+LEFT JOIN                
+( 
+t2
+LEFT JOIN              
+(t3, t4)
+ON t3.a=1 AND t2.b=t4.b,
+t5 
+LEFT JOIN 
+( 
+(t6, t7)
+LEFT JOIN 
+t8
+ON t7.b=t8.b AND t6.b < 10
+)
+ON t6.b >= 2 AND t5.b=t7.b 
+)
+ON (t3.b=2 OR t3.c IS NULL) AND (t6.b=2 OR t6.c IS NULL) AND
+(t1.b=t5.b OR t3.c IS NULL OR t6.c IS NULL or t8.c IS NULL) AND
+(t1.a != 2),
+t9
+WHERE t0.a=1 AND
+t0.b=t1.b AND          
+(t2.a >= 4 OR t2.c IS NULL) AND
+(t3.a < 5 OR t3.c IS NULL) AND
+(t3.b=t4.b OR t3.c IS NULL OR t4.c IS NULL) AND
+(t5.a >=2 OR t5.c IS NULL) AND
+(t6.a >=4 OR t6.c IS NULL) AND
+(t7.a <= 2 OR t7.c IS NULL) AND
+(t8.a < 1 OR t8.c IS NULL) AND
+(t8.b=t9.b OR t8.c IS NULL) AND
+(t9.a=1);
+a	b	a	b	a	b	a	b	a	b	a	b	a	b	a	b	a	b	a	b
+1	2	3	2	4	2	1	2	3	2	2	2	6	2	2	2	0	2	1	2
+1	2	3	2	4	2	1	2	4	2	2	2	6	2	2	2	0	2	1	2
+1	2	3	2	4	2	1	2	3	2	3	1	6	2	1	1	NULL	NULL	1	1
+1	2	3	2	4	2	1	2	4	2	3	1	6	2	1	1	NULL	NULL	1	1
+1	2	3	2	4	2	1	2	3	2	3	1	6	2	1	1	NULL	NULL	1	2
+1	2	3	2	4	2	1	2	4	2	3	1	6	2	1	1	NULL	NULL	1	2
+1	2	3	2	4	2	1	2	3	2	3	3	NULL	NULL	NULL	NULL	NULL	NULL	1	1
+1	2	3	2	4	2	1	2	4	2	3	3	NULL	NULL	NULL	NULL	NULL	NULL	1	1
+1	2	3	2	4	2	1	2	3	2	3	3	NULL	NULL	NULL	NULL	NULL	NULL	1	2
+1	2	3	2	4	2	1	2	4	2	3	3	NULL	NULL	NULL	NULL	NULL	NULL	1	2
+1	2	3	2	5	3	NULL	NULL	NULL	NULL	2	2	6	2	2	2	0	2	1	2
+1	2	3	2	5	3	NULL	NULL	NULL	NULL	3	1	6	2	1	1	NULL	NULL	1	1
+1	2	3	2	5	3	NULL	NULL	NULL	NULL	3	1	6	2	1	1	NULL	NULL	1	2
+1	2	3	2	5	3	NULL	NULL	NULL	NULL	3	3	NULL	NULL	NULL	NULL	NULL	NULL	1	1
+1	2	3	2	5	3	NULL	NULL	NULL	NULL	3	3	NULL	NULL	NULL	NULL	NULL	NULL	1	2
+1	2	2	2	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	1	1
+1	2	2	2	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	1	2
+SELECT t1.a,t1.b
+FROM t1;
+a	b
+1	3
+2	2
+3	2
+SELECT t2.a,t2.b
+FROM t2;
+a	b
+3	3
+4	2
+5	3
+SELECT t3.a,t3.b
+FROM t3;
+a	b
+1	2
+2	2
+SELECT t2.a,t2.b,t3.a,t3.b
+FROM t2 
+LEFT JOIN              
+t3
+ON t2.b=t3.b;
+a	b	a	b
+4	2	1	2
+4	2	2	2
+3	3	NULL	NULL
+5	3	NULL	NULL
+SELECT t1.a,t1.b,t2.a,t2.b,t3.a,t3.b
+FROM t1, t2 
+LEFT JOIN              
+t3
+ON t2.b=t3.b
+WHERE t1.a <= 2;
+a	b	a	b	a	b
+1	3	4	2	1	2
+2	2	4	2	1	2
+1	3	4	2	2	2
+2	2	4	2	2	2
+1	3	3	3	NULL	NULL
+2	2	3	3	NULL	NULL
+1	3	5	3	NULL	NULL
+2	2	5	3	NULL	NULL
+SELECT t1.a,t1.b,t2.a,t2.b,t3.a,t3.b
+FROM t1, t3 
+RIGHT JOIN              
+t2
+ON t2.b=t3.b
+WHERE t1.a <= 2;
+a	b	a	b	a	b
+1	3	4	2	1	2
+2	2	4	2	1	2
+1	3	4	2	2	2
+2	2	4	2	2	2
+1	3	3	3	NULL	NULL
+2	2	3	3	NULL	NULL
+1	3	5	3	NULL	NULL
+2	2	5	3	NULL	NULL
+SELECT t3.a,t3.b,t4.a,t4.b
+FROM t3,t4;
+a	b	a	b
+1	2	3	2
+2	2	3	2
+1	2	4	2
+2	2	4	2
+SELECT t2.a,t2.b,t3.a,t3.b,t4.a,t4.b
+FROM t2 
+LEFT JOIN              
+(t3, t4)
+ON t3.a=1 AND t2.b=t4.b;
+a	b	a	b	a	b
+4	2	1	2	3	2
+4	2	1	2	4	2
+3	3	NULL	NULL	NULL	NULL
+5	3	NULL	NULL	NULL	NULL
+SELECT t1.a,t1.b,t2.a,t2.b,t3.a,t3.b,t4.a,t4.b
+FROM t1, t2 
+LEFT JOIN              
+(t3, t4)
+ON t3.a=1 AND t2.b=t4.b
+WHERE t1.a <= 2;
+a	b	a	b	a	b	a	b
+1	3	4	2	1	2	3	2
+2	2	4	2	1	2	3	2
+1	3	4	2	1	2	4	2
+2	2	4	2	1	2	4	2
+1	3	3	3	NULL	NULL	NULL	NULL
+2	2	3	3	NULL	NULL	NULL	NULL
+1	3	5	3	NULL	NULL	NULL	NULL
+2	2	5	3	NULL	NULL	NULL	NULL
+SELECT t1.a,t1.b,t2.a,t2.b,t3.a,t3.b,t4.a,t4.b
+FROM t1, (t3, t4) 
+RIGHT JOIN              
+t2
+ON t3.a=1 AND t2.b=t4.b
+WHERE t1.a <= 2;
+a	b	a	b	a	b	a	b
+1	3	4	2	1	2	3	2
+2	2	4	2	1	2	3	2
+1	3	4	2	1	2	4	2
+2	2	4	2	1	2	4	2
+1	3	3	3	NULL	NULL	NULL	NULL
+2	2	3	3	NULL	NULL	NULL	NULL
+1	3	5	3	NULL	NULL	NULL	NULL
+2	2	5	3	NULL	NULL	NULL	NULL
+SELECT t1.a,t1.b,t2.a,t2.b,t3.a,t3.b,t4.a,t4.b
+FROM t1, (t3, t4)
+RIGHT JOIN              
+t2
+ON t3.a=1 AND t2.b=t4.b
+WHERE t1.a <= 2;
+a	b	a	b	a	b	a	b
+1	3	4	2	1	2	3	2
+2	2	4	2	1	2	3	2
+1	3	4	2	1	2	4	2
+2	2	4	2	1	2	4	2
+1	3	3	3	NULL	NULL	NULL	NULL
+2	2	3	3	NULL	NULL	NULL	NULL
+1	3	5	3	NULL	NULL	NULL	NULL
+2	2	5	3	NULL	NULL	NULL	NULL
+EXPLAIN EXTENDED
+SELECT t1.a,t1.b,t2.a,t2.b,t3.a,t3.b,t4.a,t4.b
+FROM t1, (t3, t4)
+RIGHT JOIN
+t2
+ON t3.a=1 AND t2.b=t4.b
+WHERE t1.a <= 2;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	3	100.00	Using join buffer
+1	SIMPLE	t3	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where; Using join buffer
+1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where; Using join buffer
+Warnings:
+Note	1003	select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b`,`test`.`t3`.`a` AS `a`,`test`.`t3`.`b` AS `b`,`test`.`t4`.`a` AS `a`,`test`.`t4`.`b` AS `b` from `test`.`t1` join `test`.`t2` left join (`test`.`t3` join `test`.`t4`) on(((`test`.`t4`.`b` = `test`.`t2`.`b`) and (`test`.`t3`.`a` = 1))) where (`test`.`t1`.`a` <= 2)
+CREATE INDEX idx_b ON t2(b);
+EXPLAIN EXTENDED
+SELECT t2.a,t2.b,t3.a,t3.b,t4.a,t4.b
+FROM (t3,t4)
+LEFT JOIN              
+(t1,t2)
+ON t3.a=1 AND t3.b=t2.b AND t2.b=t4.b;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	SIMPLE	t3	ALL	NULL	NULL	NULL	NULL	2	100.00	
+1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	2	100.00	Using join buffer
+1	SIMPLE	t2	ref	idx_b	idx_b	5	test.t3.b	2	100.00	Using where; Using join buffer
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	100.00	Using join buffer
+Warnings:
+Note	1003	select `test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b`,`test`.`t3`.`a` AS `a`,`test`.`t3`.`b` AS `b`,`test`.`t4`.`a` AS `a`,`test`.`t4`.`b` AS `b` from `test`.`t3` join `test`.`t4` left join (`test`.`t1` join `test`.`t2`) on(((`test`.`t3`.`a` = 1) and (`test`.`t3`.`b` = `test`.`t2`.`b`) and (`test`.`t2`.`b` = `test`.`t4`.`b`))) where 1
+SELECT t2.a,t2.b,t3.a,t3.b,t4.a,t4.b
+FROM (t3,t4)
+LEFT JOIN              
+(t1,t2)
+ON t3.a=1 AND t3.b=t2.b AND t2.b=t4.b;
+a	b	a	b	a	b
+4	2	1	2	3	2
+4	2	1	2	4	2
+4	2	1	2	3	2
+4	2	1	2	4	2
+4	2	1	2	3	2
+4	2	1	2	4	2
+NULL	NULL	2	2	3	2
+NULL	NULL	2	2	4	2
+EXPLAIN EXTENDED
+SELECT t0.a,t0.b,t1.a,t1.b,t2.a,t2.b,t3.a,t3.b,t4.a,t4.b,
+t5.a,t5.b,t6.a,t6.b,t7.a,t7.b,t8.a,t8.b,t9.a,t9.b
+FROM t0,t1
+LEFT JOIN                
+( 
+t2
+LEFT JOIN              
+(t3, t4)
+ON t3.a=1 AND t2.b=t4.b,
+t5 
+LEFT JOIN 
+( 
+(t6, t7)
+LEFT JOIN 
+t8
+ON t7.b=t8.b AND t6.b < 10
+)
+ON t6.b >= 2 AND t5.b=t7.b 
+)
+ON (t3.b=2 OR t3.c IS NULL) AND (t6.b=2 OR t6.c IS NULL) AND
+(t1.b=t5.b OR t3.c IS NULL OR t6.c IS NULL or t8.c IS NULL) AND
+(t1.a != 2),
+t9
+WHERE t0.a=1 AND
+t0.b=t1.b AND          
+(t2.a >= 4 OR t2.c IS NULL) AND
+(t3.a < 5 OR t3.c IS NULL) AND
+(t3.b=t4.b OR t3.c IS NULL OR t4.c IS NULL) AND
+(t5.a >=2 OR t5.c IS NULL) AND
+(t6.a >=4 OR t6.c IS NULL) AND
+(t7.a <= 2 OR t7.c IS NULL) AND
+(t8.a < 1 OR t8.c IS NULL) AND
+(t8.b=t9.b OR t8.c IS NULL) AND
+(t9.a=1);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	SIMPLE	t0	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where; Using join buffer
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where; Using join buffer
+1	SIMPLE	t3	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where; Using join buffer
+1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where; Using join buffer
+1	SIMPLE	t5	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where; Using join buffer
+1	SIMPLE	t7	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where; Using join buffer
+1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where; Using join buffer
+1	SIMPLE	t8	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where; Using join buffer
+1	SIMPLE	t9	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where; Using join buffer
+Warnings:
+Note	1003	select `test`.`t0`.`a` AS `a`,`test`.`t0`.`b` AS `b`,`test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b`,`test`.`t3`.`a` AS `a`,`test`.`t3`.`b` AS `b`,`test`.`t4`.`a` AS `a`,`test`.`t4`.`b` AS `b`,`test`.`t5`.`a` AS `a`,`test`.`t5`.`b` AS `b`,`test`.`t6`.`a` AS `a`,`test`.`t6`.`b` AS `b`,`test`.`t7`.`a` AS `a`,`test`.`t7`.`b` AS `b`,`test`.`t8`.`a` AS `a`,`test`.`t8`.`b` AS `b`,`test`.`t9`.`a` AS `a`,`test`.`t9`.`b` AS `b` from `test`.`t0` join `test`.`t1` left join (`test`.`t2` left join (`test`.`t3` join `test`.`t4`) on(((`test`.`t4`.`b` = `test`.`t2`.`b`) and (`test`.`t3`.`a` = 1))) join `test`.`t5` left join (`test`.`t6` join `test`.`t7` left join `test`.`t8` on(((`test`.`t8`.`b` = `test`.`t5`.`b`) and (`test`.`t6`.`b` < 10)))) on(((`test`.`t7`.`b` = `test`.`t5`.`b`) and (`test`.`t6`.`b` >= 2)))) on((((`test`.`t3`.`b` = 2) or isnull(`test`.`t3`.`c`)) and ((`test`.`t6`.`b` = 2) or isnull(`test`.`t6`.`c`)) and ((`test`.`t5`.`b` = `test`.`t0`.`b`) or isnull(`test`.`t3`.`c`) or isnull(`test`.`t6`.`c`) or isnull(`test`.`t8`.`c`)) and (`test`.`t1`.`a` <> 2))) join `test`.`t9` where ((`test`.`t9`.`a` = 1) and (`test`.`t1`.`b` = `test`.`t0`.`b`) and (`test`.`t0`.`a` = 1) and ((`test`.`t2`.`a` >= 4) or isnull(`test`.`t2`.`c`)) and ((`test`.`t3`.`a` < 5) or isnull(`test`.`t3`.`c`)) and ((`test`.`t4`.`b` = `test`.`t3`.`b`) or isnull(`test`.`t3`.`c`) or isnull(`test`.`t4`.`c`)) and ((`test`.`t5`.`a` >= 2) or isnull(`test`.`t5`.`c`)) and ((`test`.`t6`.`a` >= 4) or isnull(`test`.`t6`.`c`)) and ((`test`.`t7`.`a` <= 2) or isnull(`test`.`t7`.`c`)) and ((`test`.`t8`.`a` < 1) or isnull(`test`.`t8`.`c`)) and ((`test`.`t9`.`b` = `test`.`t8`.`b`) or isnull(`test`.`t8`.`c`)))
+CREATE INDEX idx_b ON t4(b);
+CREATE INDEX idx_b ON t5(b);
+EXPLAIN EXTENDED
+SELECT t0.a,t0.b,t1.a,t1.b,t2.a,t2.b,t3.a,t3.b,t4.a,t4.b,
+t5.a,t5.b,t6.a,t6.b,t7.a,t7.b,t8.a,t8.b,t9.a,t9.b
+FROM t0,t1
+LEFT JOIN                
+( 
+t2
+LEFT JOIN              
+(t3, t4)
+ON t3.a=1 AND t2.b=t4.b,
+t5 
+LEFT JOIN 
+( 
+(t6, t7)
+LEFT JOIN 
+t8
+ON t7.b=t8.b AND t6.b < 10
+)
+ON t6.b >= 2 AND t5.b=t7.b 
+)
+ON (t3.b=2 OR t3.c IS NULL) AND (t6.b=2 OR t6.c IS NULL) AND
+(t1.b=t5.b OR t3.c IS NULL OR t6.c IS NULL or t8.c IS NULL) AND
+(t1.a != 2),
+t9
+WHERE t0.a=1 AND
+t0.b=t1.b AND          
+(t2.a >= 4 OR t2.c IS NULL) AND
+(t3.a < 5 OR t3.c IS NULL) AND
+(t3.b=t4.b OR t3.c IS NULL OR t4.c IS NULL) AND
+(t5.a >=2 OR t5.c IS NULL) AND
+(t6.a >=4 OR t6.c IS NULL) AND
+(t7.a <= 2 OR t7.c IS NULL) AND
+(t8.a < 1 OR t8.c IS NULL) AND
+(t8.b=t9.b OR t8.c IS NULL) AND
+(t9.a=1);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	SIMPLE	t0	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where; Using join buffer
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where; Using join buffer
+1	SIMPLE	t3	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where; Using join buffer
+1	SIMPLE	t4	ref	idx_b	idx_b	5	test.t2.b	2	100.00	Using where; Using join buffer
+1	SIMPLE	t5	ALL	idx_b	NULL	NULL	NULL	3	100.00	Using where; Using join buffer
+1	SIMPLE	t7	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where; Using join buffer
+1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where; Using join buffer
+1	SIMPLE	t8	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where; Using join buffer
+1	SIMPLE	t9	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where; Using join buffer
+Warnings:
+Note	1003	select `test`.`t0`.`a` AS `a`,`test`.`t0`.`b` AS `b`,`test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b`,`test`.`t3`.`a` AS `a`,`test`.`t3`.`b` AS `b`,`test`.`t4`.`a` AS `a`,`test`.`t4`.`b` AS `b`,`test`.`t5`.`a` AS `a`,`test`.`t5`.`b` AS `b`,`test`.`t6`.`a` AS `a`,`test`.`t6`.`b` AS `b`,`test`.`t7`.`a` AS `a`,`test`.`t7`.`b` AS `b`,`test`.`t8`.`a` AS `a`,`test`.`t8`.`b` AS `b`,`test`.`t9`.`a` AS `a`,`test`.`t9`.`b` AS `b` from `test`.`t0` join `test`.`t1` left join (`test`.`t2` left join (`test`.`t3` join `test`.`t4`) on(((`test`.`t4`.`b` = `test`.`t2`.`b`) and (`test`.`t3`.`a` = 1))) join `test`.`t5` left join (`test`.`t6` join `test`.`t7` left join `test`.`t8` on(((`test`.`t8`.`b` = `test`.`t5`.`b`) and (`test`.`t6`.`b` < 10)))) on(((`test`.`t7`.`b` = `test`.`t5`.`b`) and (`test`.`t6`.`b` >= 2)))) on((((`test`.`t3`.`b` = 2) or isnull(`test`.`t3`.`c`)) and ((`test`.`t6`.`b` = 2) or isnull(`test`.`t6`.`c`)) and ((`test`.`t5`.`b` = `test`.`t0`.`b`) or isnull(`test`.`t3`.`c`) or isnull(`test`.`t6`.`c`) or isnull(`test`.`t8`.`c`)) and (`test`.`t1`.`a` <> 2))) join `test`.`t9` where ((`test`.`t9`.`a` = 1) and (`test`.`t1`.`b` = `test`.`t0`.`b`) and (`test`.`t0`.`a` = 1) and ((`test`.`t2`.`a` >= 4) or isnull(`test`.`t2`.`c`)) and ((`test`.`t3`.`a` < 5) or isnull(`test`.`t3`.`c`)) and ((`test`.`t4`.`b` = `test`.`t3`.`b`) or isnull(`test`.`t3`.`c`) or isnull(`test`.`t4`.`c`)) and ((`test`.`t5`.`a` >= 2) or isnull(`test`.`t5`.`c`)) and ((`test`.`t6`.`a` >= 4) or isnull(`test`.`t6`.`c`)) and ((`test`.`t7`.`a` <= 2) or isnull(`test`.`t7`.`c`)) and ((`test`.`t8`.`a` < 1) or isnull(`test`.`t8`.`c`)) and ((`test`.`t9`.`b` = `test`.`t8`.`b`) or isnull(`test`.`t8`.`c`)))
+CREATE INDEX idx_b ON t8(b);
+EXPLAIN EXTENDED
+SELECT t0.a,t0.b,t1.a,t1.b,t2.a,t2.b,t3.a,t3.b,t4.a,t4.b,
+t5.a,t5.b,t6.a,t6.b,t7.a,t7.b,t8.a,t8.b,t9.a,t9.b
+FROM t0,t1
+LEFT JOIN                
+( 
+t2
+LEFT JOIN              
+(t3, t4)
+ON t3.a=1 AND t2.b=t4.b,
+t5 
+LEFT JOIN 
+( 
+(t6, t7)
+LEFT JOIN 
+t8
+ON t7.b=t8.b AND t6.b < 10
+)
+ON t6.b >= 2 AND t5.b=t7.b 
+)
+ON (t3.b=2 OR t3.c IS NULL) AND (t6.b=2 OR t6.c IS NULL) AND
+(t1.b=t5.b OR t3.c IS NULL OR t6.c IS NULL or t8.c IS NULL) AND
+(t1.a != 2),
+t9
+WHERE t0.a=1 AND
+t0.b=t1.b AND          
+(t2.a >= 4 OR t2.c IS NULL) AND
+(t3.a < 5 OR t3.c IS NULL) AND
+(t3.b=t4.b OR t3.c IS NULL OR t4.c IS NULL) AND
+(t5.a >=2 OR t5.c IS NULL) AND
+(t6.a >=4 OR t6.c IS NULL) AND
+(t7.a <= 2 OR t7.c IS NULL) AND
+(t8.a < 1 OR t8.c IS NULL) AND
+(t8.b=t9.b OR t8.c IS NULL) AND
+(t9.a=1);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	SIMPLE	t0	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where; Using join buffer
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where; Using join buffer
+1	SIMPLE	t3	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where; Using join buffer
+1	SIMPLE	t4	ref	idx_b	idx_b	5	test.t2.b	2	100.00	Using where; Using join buffer
+1	SIMPLE	t5	ALL	idx_b	NULL	NULL	NULL	3	100.00	Using where; Using join buffer
+1	SIMPLE	t7	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where; Using join buffer
+1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where; Using join buffer
+1	SIMPLE	t8	ref	idx_b	idx_b	5	test.t5.b	2	100.00	Using where; Using join buffer
+1	SIMPLE	t9	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where; Using join buffer
+Warnings:
+Note	1003	select `test`.`t0`.`a` AS `a`,`test`.`t0`.`b` AS `b`,`test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b`,`test`.`t3`.`a` AS `a`,`test`.`t3`.`b` AS `b`,`test`.`t4`.`a` AS `a`,`test`.`t4`.`b` AS `b`,`test`.`t5`.`a` AS `a`,`test`.`t5`.`b` AS `b`,`test`.`t6`.`a` AS `a`,`test`.`t6`.`b` AS `b`,`test`.`t7`.`a` AS `a`,`test`.`t7`.`b` AS `b`,`test`.`t8`.`a` AS `a`,`test`.`t8`.`b` AS `b`,`test`.`t9`.`a` AS `a`,`test`.`t9`.`b` AS `b` from `test`.`t0` join `test`.`t1` left join (`test`.`t2` left join (`test`.`t3` join `test`.`t4`) on(((`test`.`t4`.`b` = `test`.`t2`.`b`) and (`test`.`t3`.`a` = 1))) join `test`.`t5` left join (`test`.`t6` join `test`.`t7` left join `test`.`t8` on(((`test`.`t8`.`b` = `test`.`t5`.`b`) and (`test`.`t6`.`b` < 10)))) on(((`test`.`t7`.`b` = `test`.`t5`.`b`) and (`test`.`t6`.`b` >= 2)))) on((((`test`.`t3`.`b` = 2) or isnull(`test`.`t3`.`c`)) and ((`test`.`t6`.`b` = 2) or isnull(`test`.`t6`.`c`)) and ((`test`.`t5`.`b` = `test`.`t0`.`b`) or isnull(`test`.`t3`.`c`) or isnull(`test`.`t6`.`c`) or isnull(`test`.`t8`.`c`)) and (`test`.`t1`.`a` <> 2))) join `test`.`t9` where ((`test`.`t9`.`a` = 1) and (`test`.`t1`.`b` = `test`.`t0`.`b`) and (`test`.`t0`.`a` = 1) and ((`test`.`t2`.`a` >= 4) or isnull(`test`.`t2`.`c`)) and ((`test`.`t3`.`a` < 5) or isnull(`test`.`t3`.`c`)) and ((`test`.`t4`.`b` = `test`.`t3`.`b`) or isnull(`test`.`t3`.`c`) or isnull(`test`.`t4`.`c`)) and ((`test`.`t5`.`a` >= 2) or isnull(`test`.`t5`.`c`)) and ((`test`.`t6`.`a` >= 4) or isnull(`test`.`t6`.`c`)) and ((`test`.`t7`.`a` <= 2) or isnull(`test`.`t7`.`c`)) and ((`test`.`t8`.`a` < 1) or isnull(`test`.`t8`.`c`)) and ((`test`.`t9`.`b` = `test`.`t8`.`b`) or isnull(`test`.`t8`.`c`)))
+CREATE INDEX idx_b ON t1(b);
+CREATE INDEX idx_a ON t0(a);
+EXPLAIN EXTENDED
+SELECT t0.a,t0.b,t1.a,t1.b,t2.a,t2.b,t3.a,t3.b,t4.a,t4.b,
+t5.a,t5.b,t6.a,t6.b,t7.a,t7.b,t8.a,t8.b,t9.a,t9.b
+FROM t0,t1
+LEFT JOIN                
+( 
+t2
+LEFT JOIN              
+(t3, t4)
+ON t3.a=1 AND t2.b=t4.b,
+t5 
+LEFT JOIN 
+( 
+(t6, t7)
+LEFT JOIN 
+t8
+ON t7.b=t8.b AND t6.b < 10
+)
+ON t6.b >= 2 AND t5.b=t7.b 
+)
+ON (t3.b=2 OR t3.c IS NULL) AND (t6.b=2 OR t6.c IS NULL) AND
+(t1.b=t5.b OR t3.c IS NULL OR t6.c IS NULL or t8.c IS NULL) AND
+(t1.a != 2),
+t9
+WHERE t0.a=1 AND
+t0.b=t1.b AND          
+(t2.a >= 4 OR t2.c IS NULL) AND
+(t3.a < 5 OR t3.c IS NULL) AND
+(t3.b=t4.b OR t3.c IS NULL OR t4.c IS NULL) AND
+(t5.a >=2 OR t5.c IS NULL) AND
+(t6.a >=4 OR t6.c IS NULL) AND
+(t7.a <= 2 OR t7.c IS NULL) AND
+(t8.a < 1 OR t8.c IS NULL) AND
+(t8.b=t9.b OR t8.c IS NULL) AND
+(t9.a=1);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	SIMPLE	t0	ref	idx_a	idx_a	5	const	1	100.00	
+1	SIMPLE	t1	ref	idx_b	idx_b	5	test.t0.b	2	100.00	Using join buffer
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where; Using join buffer
+1	SIMPLE	t3	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where; Using join buffer
+1	SIMPLE	t4	ref	idx_b	idx_b	5	test.t2.b	2	100.00	Using where; Using join buffer
+1	SIMPLE	t5	ALL	idx_b	NULL	NULL	NULL	3	100.00	Using where; Using join buffer
+1	SIMPLE	t7	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where; Using join buffer
+1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where; Using join buffer
+1	SIMPLE	t8	ref	idx_b	idx_b	5	test.t5.b	2	100.00	Using where; Using join buffer
+1	SIMPLE	t9	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where; Using join buffer
+Warnings:
+Note	1003	select `test`.`t0`.`a` AS `a`,`test`.`t0`.`b` AS `b`,`test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b`,`test`.`t3`.`a` AS `a`,`test`.`t3`.`b` AS `b`,`test`.`t4`.`a` AS `a`,`test`.`t4`.`b` AS `b`,`test`.`t5`.`a` AS `a`,`test`.`t5`.`b` AS `b`,`test`.`t6`.`a` AS `a`,`test`.`t6`.`b` AS `b`,`test`.`t7`.`a` AS `a`,`test`.`t7`.`b` AS `b`,`test`.`t8`.`a` AS `a`,`test`.`t8`.`b` AS `b`,`test`.`t9`.`a` AS `a`,`test`.`t9`.`b` AS `b` from `test`.`t0` join `test`.`t1` left join (`test`.`t2` left join (`test`.`t3` join `test`.`t4`) on(((`test`.`t4`.`b` = `test`.`t2`.`b`) and (`test`.`t3`.`a` = 1))) join `test`.`t5` left join (`test`.`t6` join `test`.`t7` left join `test`.`t8` on(((`test`.`t8`.`b` = `test`.`t5`.`b`) and (`test`.`t6`.`b` < 10)))) on(((`test`.`t7`.`b` = `test`.`t5`.`b`) and (`test`.`t6`.`b` >= 2)))) on((((`test`.`t3`.`b` = 2) or isnull(`test`.`t3`.`c`)) and ((`test`.`t6`.`b` = 2) or isnull(`test`.`t6`.`c`)) and ((`test`.`t5`.`b` = `test`.`t0`.`b`) or isnull(`test`.`t3`.`c`) or isnull(`test`.`t6`.`c`) or isnull(`test`.`t8`.`c`)) and (`test`.`t1`.`a` <> 2))) join `test`.`t9` where ((`test`.`t9`.`a` = 1) and (`test`.`t1`.`b` = `test`.`t0`.`b`) and (`test`.`t0`.`a` = 1) and ((`test`.`t2`.`a` >= 4) or isnull(`test`.`t2`.`c`)) and ((`test`.`t3`.`a` < 5) or isnull(`test`.`t3`.`c`)) and ((`test`.`t4`.`b` = `test`.`t3`.`b`) or isnull(`test`.`t3`.`c`) or isnull(`test`.`t4`.`c`)) and ((`test`.`t5`.`a` >= 2) or isnull(`test`.`t5`.`c`)) and ((`test`.`t6`.`a` >= 4) or isnull(`test`.`t6`.`c`)) and ((`test`.`t7`.`a` <= 2) or isnull(`test`.`t7`.`c`)) and ((`test`.`t8`.`a` < 1) or isnull(`test`.`t8`.`c`)) and ((`test`.`t9`.`b` = `test`.`t8`.`b`) or isnull(`test`.`t8`.`c`)))
+SELECT t0.a,t0.b,t1.a,t1.b,t2.a,t2.b,t3.a,t3.b,t4.a,t4.b,
+t5.a,t5.b,t6.a,t6.b,t7.a,t7.b,t8.a,t8.b,t9.a,t9.b
+FROM t0,t1
+LEFT JOIN                
+( 
+t2
+LEFT JOIN              
+(t3, t4)
+ON t3.a=1 AND t2.b=t4.b,
+t5 
+LEFT JOIN 
+( 
+(t6, t7)
+LEFT JOIN 
+t8
+ON t7.b=t8.b AND t6.b < 10
+)
+ON t6.b >= 2 AND t5.b=t7.b 
+)
+ON (t3.b=2 OR t3.c IS NULL) AND (t6.b=2 OR t6.c IS NULL) AND
+(t1.b=t5.b OR t3.c IS NULL OR t6.c IS NULL or t8.c IS NULL) AND
+(t1.a != 2),
+t9
+WHERE t0.a=1 AND
+t0.b=t1.b AND          
+(t2.a >= 4 OR t2.c IS NULL) AND
+(t3.a < 5 OR t3.c IS NULL) AND
+(t3.b=t4.b OR t3.c IS NULL OR t4.c IS NULL) AND
+(t5.a >=2 OR t5.c IS NULL) AND
+(t6.a >=4 OR t6.c IS NULL) AND
+(t7.a <= 2 OR t7.c IS NULL) AND
+(t8.a < 1 OR t8.c IS NULL) AND
+(t8.b=t9.b OR t8.c IS NULL) AND
+(t9.a=1);
+a	b	a	b	a	b	a	b	a	b	a	b	a	b	a	b	a	b	a	b
+1	2	3	2	4	2	1	2	3	2	2	2	6	2	2	2	0	2	1	2
+1	2	3	2	4	2	1	2	4	2	2	2	6	2	2	2	0	2	1	2
+1	2	3	2	4	2	1	2	3	2	3	1	6	2	1	1	NULL	NULL	1	1
+1	2	3	2	4	2	1	2	4	2	3	1	6	2	1	1	NULL	NULL	1	1
+1	2	3	2	4	2	1	2	3	2	3	1	6	2	1	1	NULL	NULL	1	2
+1	2	3	2	4	2	1	2	4	2	3	1	6	2	1	1	NULL	NULL	1	2
+1	2	3	2	4	2	1	2	3	2	3	3	NULL	NULL	NULL	NULL	NULL	NULL	1	1
+1	2	3	2	4	2	1	2	4	2	3	3	NULL	NULL	NULL	NULL	NULL	NULL	1	1
+1	2	3	2	4	2	1	2	3	2	3	3	NULL	NULL	NULL	NULL	NULL	NULL	1	2
+1	2	3	2	4	2	1	2	4	2	3	3	NULL	NULL	NULL	NULL	NULL	NULL	1	2
+1	2	3	2	5	3	NULL	NULL	NULL	NULL	2	2	6	2	2	2	0	2	1	2
+1	2	3	2	5	3	NULL	NULL	NULL	NULL	3	1	6	2	1	1	NULL	NULL	1	1
+1	2	3	2	5	3	NULL	NULL	NULL	NULL	3	1	6	2	1	1	NULL	NULL	1	2
+1	2	3	2	5	3	NULL	NULL	NULL	NULL	3	3	NULL	NULL	NULL	NULL	NULL	NULL	1	1
+1	2	3	2	5	3	NULL	NULL	NULL	NULL	3	3	NULL	NULL	NULL	NULL	NULL	NULL	1	2
+1	2	2	2	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	1	1
+1	2	2	2	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	1	2
+SELECT t2.a,t2.b
+FROM t2;
+a	b
+3	3
+4	2
+5	3
+SELECT t3.a,t3.b
+FROM t3;
+a	b
+1	2
+2	2
+SELECT t2.a,t2.b,t3.a,t3.b
+FROM t2 LEFT JOIN t3 ON t2.b=t3.b
+WHERE t2.a = 4 OR (t2.a > 4 AND t3.a IS NULL);
+a	b	a	b
+4	2	1	2
+4	2	2	2
+5	3	NULL	NULL
+SELECT t2.a,t2.b,t3.a,t3.b
+FROM t2 LEFT JOIN (t3) ON t2.b=t3.b
+WHERE t2.a = 4 OR (t2.a > 4 AND t3.a IS NULL);
+a	b	a	b
+4	2	1	2
+4	2	2	2
+5	3	NULL	NULL
+ALTER TABLE t3
+CHANGE COLUMN a a1 int,
+CHANGE COLUMN c c1 int;
+SELECT t2.a,t2.b,t3.a1,t3.b
+FROM t2 LEFT JOIN t3 ON t2.b=t3.b
+WHERE t2.a = 4 OR (t2.a > 4 AND t3.a1 IS NULL);
+a	b	a1	b
+4	2	1	2
+4	2	2	2
+5	3	NULL	NULL
+SELECT t2.a,t2.b,t3.a1,t3.b
+FROM t2 NATURAL LEFT JOIN t3
+WHERE t2.a = 4 OR (t2.a > 4 AND t3.a1 IS NULL);
+a	b	a1	b
+4	2	1	2
+4	2	2	2
+5	3	NULL	NULL
+DROP TABLE t0,t1,t2,t3,t4,t5,t6,t7,t8,t9;
+CREATE TABLE t1 (a int);
+CREATE TABLE t2 (a int);
+CREATE TABLE t3 (a int);
+INSERT INTO t1 VALUES (1);
+INSERT INTO t2 VALUES (2);
+INSERT INTO t3 VALUES (2);
+INSERT INTO t1 VALUES (2);
+SELECT * FROM t1 LEFT JOIN (t2 LEFT JOIN t3 ON t2.a=t3.a) ON t1.a=t3.a;
+a	a	a
+2	2	2
+1	NULL	NULL
+SELECT * FROM t1 LEFT JOIN t2 LEFT JOIN t3 ON t2.a=t3.a ON t1.a=t3.a;
+a	a	a
+2	2	2
+1	NULL	NULL
+DELETE FROM t1 WHERE a=2;
+SELECT * FROM t1 LEFT JOIN t2 LEFT JOIN t3 ON t2.a=t3.a ON t1.a=t3.a;
+a	a	a
+1	NULL	NULL
+DELETE FROM t2;
+SELECT * FROM t1 LEFT JOIN t2 LEFT JOIN t3 ON t2.a=t3.a ON t1.a=t3.a;
+a	a	a
+1	NULL	NULL
+DROP TABLE t1,t2,t3;
+CREATE TABLE t1(a int, key (a));
+CREATE TABLE t2(b int, key (b));
+CREATE TABLE t3(c int, key (c));
+INSERT INTO t1 VALUES (NULL), (0), (1), (2), (3), (4), (5), (6), (7), (8), (9),
+(10), (11), (12), (13), (14), (15), (16), (17), (18), (19);
+INSERT INTO t2 VALUES (NULL), (0), (1), (2), (3), (4), (5), (6), (7), (8), (9),
+(10), (11), (12), (13), (14), (15), (16), (17), (18), (19);
+INSERT INTO t3 VALUES (0), (1), (2), (3), (4), (5);
+EXPLAIN SELECT a, b, c FROM t1 LEFT JOIN (t2, t3) ON c < 3 and b = c;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	index	NULL	a	5	NULL	21	Using index
+1	SIMPLE	t3	index	c	c	5	NULL	6	Using where; Using index
+1	SIMPLE	t2	ref	b	b	5	test.t3.c	2	Using index
+EXPLAIN SELECT a, b, c FROM t1 LEFT JOIN (t2, t3) ON b < 3 and b = c;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	index	NULL	a	5	NULL	21	Using index
+1	SIMPLE	t3	index	c	c	5	NULL	6	Using index
+1	SIMPLE	t2	ref	b	b	5	test.t3.c	2	Using where; Using index
+SELECT a, b, c FROM t1 LEFT JOIN (t2, t3) ON b < 3 and b = c;
+a	b	c
+NULL	0	0
+NULL	1	1
+NULL	2	2
+0	0	0
+0	1	1
+0	2	2
+1	0	0
+1	1	1
+1	2	2
+2	0	0
+2	1	1
+2	2	2
+3	0	0
+3	1	1
+3	2	2
+4	0	0
+4	1	1
+4	2	2
+5	0	0
+5	1	1
+5	2	2
+6	0	0
+6	1	1
+6	2	2
+7	0	0
+7	1	1
+7	2	2
+8	0	0
+8	1	1
+8	2	2
+9	0	0
+9	1	1
+9	2	2
+10	0	0
+10	1	1
+10	2	2
+11	0	0
+11	1	1
+11	2	2
+12	0	0
+12	1	1
+12	2	2
+13	0	0
+13	1	1
+13	2	2
+14	0	0
+14	1	1
+14	2	2
+15	0	0
+15	1	1
+15	2	2
+16	0	0
+16	1	1
+16	2	2
+17	0	0
+17	1	1
+17	2	2
+18	0	0
+18	1	1
+18	2	2
+19	0	0
+19	1	1
+19	2	2
+DELETE FROM t3;
+EXPLAIN SELECT a, b, c FROM t1 LEFT JOIN (t2, t3) ON b < 3 and b = c;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	index	NULL	a	5	NULL	21	Using index
+1	SIMPLE	t3	index	c	c	5	NULL	0	Using index
+1	SIMPLE	t2	ref	b	b	5	test.t3.c	2	Using where; Using index
+SELECT a, b, c FROM t1 LEFT JOIN (t2, t3) ON b < 3 and b = c;
+a	b	c
+NULL	NULL	NULL
+0	NULL	NULL
+1	NULL	NULL
+2	NULL	NULL
+3	NULL	NULL
+4	NULL	NULL
+5	NULL	NULL
+6	NULL	NULL
+7	NULL	NULL
+8	NULL	NULL
+9	NULL	NULL
+10	NULL	NULL
+11	NULL	NULL
+12	NULL	NULL
+13	NULL	NULL
+14	NULL	NULL
+15	NULL	NULL
+16	NULL	NULL
+17	NULL	NULL
+18	NULL	NULL
+19	NULL	NULL
+DROP TABLE t1,t2,t3;
+CREATE TABLE t1 (c11 int);
+CREATE TABLE t2 (c21 int);
+CREATE TABLE t3 (c31 int);
+INSERT INTO t1 VALUES (4), (5);
+SELECT * FROM t1 LEFT JOIN t2 ON c11=c21;
+c11	c21
+4	NULL
+5	NULL
+EXPLAIN SELECT * FROM t1 LEFT JOIN t2 ON c11=c21;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t2	system	NULL	NULL	NULL	NULL	0	const row not found
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	2	
+SELECT * FROM t1 LEFT JOIN (t2 LEFT JOIN t3 ON c21=c31) ON c11=c21;
+c11	c21	c31
+4	NULL	NULL
+5	NULL	NULL
+EXPLAIN SELECT * FROM t1 LEFT JOIN (t2 LEFT JOIN t3 ON c21=c31) ON c11=c21;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	2	
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	0	Using where; Using join buffer
+1	SIMPLE	t3	ALL	NULL	NULL	NULL	NULL	0	Using where; Using join buffer
+DROP TABLE t1,t2,t3;
+CREATE TABLE t1 (goods int(12) NOT NULL, price varchar(128) NOT NULL);
+INSERT INTO t1 VALUES (23, 2340), (26, 9900);
+CREATE TABLE t2 (goods int(12), name varchar(50), shop char(2));
+INSERT INTO t2 VALUES (23, 'as300', 'fr'), (26, 'as600', 'fr');
+create table t3 (groupid int(12) NOT NULL, goodsid int(12) NOT NULL);
+INSERT INTO t3 VALUES (3,23), (6,26);
+CREATE TABLE t4 (groupid int(12));
+INSERT INTO t4 VALUES (1), (2), (3), (4), (5), (6);
+SELECT * FROM
+(SELECT DISTINCT gl.groupid, gp.price
+FROM t4 gl 
+LEFT JOIN
+(t3 g INNER JOIN t2 p ON g.goodsid = p.goods 
+INNER JOIN t1 gp ON p.goods = gp.goods)
+ON gl.groupid = g.groupid and p.shop = 'fr') t;
+groupid	price
+3	2340
+6	9900
+1	NULL
+2	NULL
+4	NULL
+5	NULL
+CREATE VIEW v1 AS
+SELECT g.groupid groupid, p.goods goods,  
+p.name name, p.shop shop, 
+gp.price price
+FROM t3 g INNER JOIN t2 p ON g.goodsid = p.goods
+INNER JOIN t1 gp on p.goods = gp.goods;
+CREATE VIEW v2 AS
+SELECT DISTINCT g.groupid, fr.price
+FROM t4 g
+LEFT JOIN
+v1 fr on g.groupid = fr.groupid and fr.shop = 'fr';
+SELECT * FROM v2;
+groupid	price
+3	2340
+6	9900
+1	NULL
+2	NULL
+4	NULL
+5	NULL
+SELECT * FROM 
+(SELECT DISTINCT g.groupid, fr.price
+FROM t4 g
+LEFT JOIN
+v1 fr on g.groupid = fr.groupid and fr.shop = 'fr') t;
+groupid	price
+3	2340
+6	9900
+1	NULL
+2	NULL
+4	NULL
+5	NULL
+DROP VIEW v1,v2;
+DROP TABLE t1,t2,t3,t4;
+CREATE TABLE t1(a int);
+CREATE TABLE t2(b int);
+CREATE TABLE t3(c int, d int);
+CREATE TABLE t4(d int);
+CREATE TABLE t5(e int, f int);
+CREATE TABLE t6(f int);
+CREATE VIEW v1 AS 
+SELECT e FROM t5 JOIN t6 ON t5.e=t6.f;
+CREATE VIEW v2 AS 
+SELECT e FROM t5 NATURAL JOIN t6;
+SELECT t1.a FROM t1 JOIN t2 ON a=b JOIN t3 ON a=c JOIN t4 USING(d);
+a
+SELECT t1.x FROM t1 JOIN t2 ON a=b JOIN t3 ON a=c JOIN t4 USING(d);
+ERROR 42S22: Unknown column 't1.x' in 'field list'
+SELECT t1.a FROM t1 JOIN t2 ON a=b JOIN t3 ON a=c NATURAL JOIN t4;
+a
+SELECT t1.x FROM t1 JOIN t2 ON a=b JOIN t3 ON a=c NATURAL JOIN t4;
+ERROR 42S22: Unknown column 't1.x' in 'field list'
+SELECT v1.e FROM v1 JOIN t2 ON e=b JOIN t3 ON e=c JOIN t4 USING(d);
+e
+SELECT v1.x FROM v1 JOIN t2 ON e=b JOIN t3 ON e=c JOIN t4 USING(d);
+ERROR 42S22: Unknown column 'v1.x' in 'field list'
+SELECT v2.e FROM v2 JOIN t2 ON e=b JOIN t3 ON e=c JOIN t4 USING(d);
+e
+SELECT v2.x FROM v2 JOIN t2 ON e=b JOIN t3 ON e=c JOIN t4 USING(d);
+ERROR 42S22: Unknown column 'v2.x' in 'field list'
+DROP VIEW v1, v2;
+DROP TABLE t1, t2, t3, t4, t5, t6;
+create table t1 (id1 int(11) not null);
+insert into t1 values (1),(2);
+create table t2 (id2 int(11) not null);
+insert into t2 values (1),(2),(3),(4);
+create table t3 (id3 char(16) not null);
+insert into t3 values ('100');
+create table t4 (id2 int(11) not null, id3 char(16));
+create table t5 (id1 int(11) not null, key (id1));
+insert into t5 values (1),(2),(1);
+create view v1 as
+select t4.id3 from t4 join t2 on t4.id2 = t2.id2;
+select t1.id1 from t1 inner join (t3 left join v1 on t3.id3 = v1.id3);
+id1
+1
+2
+drop view v1;
+drop table t1, t2, t3, t4, t5;
+create table t0 (a int);
+insert into t0 values (0),(1),(2),(3);
+create table t1(a int);
+insert into t1 select A.a + 10*(B.a) from t0 A, t0 B;
+create table t2 (a int, b int);
+insert into t2 values (1,1), (2,2), (3,3);
+create table t3(a int, b int, filler char(200), key(a));
+insert into t3 select a,a,'filler' from t1;
+insert into t3 select a,a,'filler' from t1;
+create table t4 like t3;
+insert into t4 select * from t3;
+insert into t4 select * from t3;
+create table t5 like t4;
+insert into t5 select * from t4;
+insert into t5 select * from t4;
+create table t6 like t5;
+insert into t6 select * from t5;
+insert into t6 select * from t5;
+create table t7 like t6;
+insert into t7 select * from t6;
+insert into t7 select * from t6;
+explain select * from t4 join 
+t2 left join (t3 join t5 on t5.a=t3.b) on t3.a=t2.b where t4.a<=>t3.b;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	X	
+1	SIMPLE	t3	ref	a	a	5	test.t2.b	X	Using join buffer
+1	SIMPLE	t5	ref	a	a	5	test.t3.b	X	Using join buffer
+1	SIMPLE	t4	ref	a	a	5	test.t3.b	X	Using index condition(BKA); Using join buffer
+explain select * from (t4 join t6 on t6.a=t4.b) right join t3 on t4.a=t3.b
+join t2 left join (t5 join t7 on t7.a=t5.b) on t5.a=t2.b where t3.a<=>t2.b;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	X	
+1	SIMPLE	t3	ref	a	a	5	test.t2.b	X	Using index condition(BKA); Using join buffer
+1	SIMPLE	t4	ref	a	a	5	test.t3.b	X	Using join buffer
+1	SIMPLE	t6	ref	a	a	5	test.t4.b	X	Using join buffer
+1	SIMPLE	t5	ref	a	a	5	test.t2.b	X	Using join buffer
+1	SIMPLE	t7	ref	a	a	5	test.t5.b	X	Using join buffer
+explain select * from t2 left join
+(t3 left join (t4 join t6 on t6.a=t4.b) on t4.a=t3.b 
+join t5 on t5.a=t3.b) on t3.a=t2.b;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	X	
+1	SIMPLE	t3	ref	a	a	5	test.t2.b	X	Using join buffer
+1	SIMPLE	t4	ref	a	a	5	test.t3.b	X	Using join buffer
+1	SIMPLE	t6	ref	a	a	5	test.t4.b	X	Using join buffer
+1	SIMPLE	t5	ref	a	a	5	test.t3.b	X	Using join buffer
+drop table t0, t1, t2, t3, t4, t5, t6, t7;
+create table t1 (a int);
+insert into t1 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
+create table t2 (a int, filler char(100), key(a));
+insert into t2 select A.a + 10*B.a, '' from t1 A, t1 B;
+create table t3 like t2;
+insert into t3 select * from t2;
+explain select * from t1 left join 
+(t2 left join t3 on (t2.a = t3.a)) 
+on (t1.a = t2.a);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	10	
+1	SIMPLE	t2	ref	a	a	5	test.t1.a	1	Using join buffer
+1	SIMPLE	t3	ref	a	a	5	test.t2.a	1	Using join buffer
+drop table t1, t2, t3;
+CREATE TABLE t1 (id int NOT NULL PRIMARY KEY, type varchar(10));
+CREATE TABLE t2 (pid int NOT NULL PRIMARY KEY, type varchar(10));
+CREATE TABLE t3 (cid int NOT NULL PRIMARY KEY,
+id int NOT NULL,
+pid int NOT NULL);
+INSERT INTO t1 VALUES (1, 'A'), (3, 'C');
+INSERT INTO t2 VALUES (1, 'A'), (3, 'C');
+INSERT INTO t3 VALUES (1, 1, 1), (3, 3, 3);
+SELECT * FROM t1 p LEFT JOIN (t3 JOIN t1)
+ON (t1.id=t3.id AND t1.type='B' AND p.id=t3.id)
+LEFT JOIN t2 ON (t3.pid=t2.pid)
+WHERE p.id=1;
+id	type	cid	id	pid	id	type	pid	type
+1	A	NULL	NULL	NULL	NULL	NULL	NULL	NULL
+CREATE VIEW v1 AS
+SELECT t3.* FROM t3 JOIN t1 ON t1.id=t3.id AND t1.type='B';
+SELECT * FROM t1 p LEFT JOIN v1 ON p.id=v1.id
+LEFT JOIN t2 ON v1.pid=t2.pid
+WHERE p.id=1;
+id	type	cid	id	pid	pid	type
+1	A	NULL	NULL	NULL	NULL	NULL
+DROP VIEW v1;
+DROP TABLE t1,t2,t3;
+CREATE TABLE t1 (id1 int PRIMARY KEY, id2 int);
+CREATE TABLE t2 (id1 int PRIMARY KEY, id2 int);
+CREATE TABLE t3 (id1 int PRIMARY KEY, id2 int);
+CREATE TABLE t4 (id1 int PRIMARY KEY, id2 int);
+CREATE TABLE t5 (id1 int PRIMARY KEY, id2 int);
+SELECT t1.id1 AS id, t5.id1 AS ngroupbynsa
+FROM t1 INNER JOIN t2 ON t2.id2 = t1.id1
+LEFT OUTER JOIN
+(t3 INNER JOIN t4 ON t4.id1 = t3.id2 INNER JOIN t5 ON t4.id2 = t5.id1)
+ON t3.id2 IS NOT NULL
+WHERE t1.id1=2;
+id	ngroupbynsa
+PREPARE stmt FROM
+"SELECT t1.id1 AS id, t5.id1 AS ngroupbynsa
+  FROM t1 INNER JOIN t2 ON t2.id2 = t1.id1
+       LEFT OUTER JOIN
+       (t3 INNER JOIN t4 ON t4.id1 = t3.id2 INNER JOIN t5 ON t4.id2 = t5.id1)
+       ON t3.id2 IS NOT NULL
+    WHERE t1.id1=2";
+EXECUTE stmt;
+id	ngroupbynsa
+EXECUTE stmt;
+id	ngroupbynsa
+EXECUTE stmt;
+id	ngroupbynsa
+EXECUTE stmt;
+id	ngroupbynsa
+INSERT INTO t1 VALUES (1,1), (2,1), (3,2);
+INSERT INTO t2 VALUES (2,1), (3,2), (4,3);
+INSERT INTO t3 VALUES (1,1), (3,2), (2,NULL);
+INSERT INTO t4 VALUES (1,1), (2,1), (3,3);
+INSERT INTO t5 VALUES (1,1), (2,2), (3,3), (4,3);
+EXECUTE stmt;
+id	ngroupbynsa
+2	1
+2	1
+EXECUTE stmt;
+id	ngroupbynsa
+2	1
+2	1
+EXECUTE stmt;
+id	ngroupbynsa
+2	1
+2	1
+EXECUTE stmt;
+id	ngroupbynsa
+2	1
+2	1
+SELECT t1.id1 AS id, t5.id1 AS ngroupbynsa
+FROM t1 INNER JOIN t2 ON t2.id2 = t1.id1
+LEFT OUTER JOIN
+(t3 INNER JOIN t4 ON t4.id1 = t3.id2 INNER JOIN t5 ON t4.id2 = t5.id1)
+ON t3.id2 IS NOT NULL
+WHERE t1.id1=2;
+id	ngroupbynsa
+2	1
+2	1
+DROP TABLE t1,t2,t3,t4,t5;
+CREATE TABLE t1 (
+id int NOT NULL PRIMARY KEY,
+ct int DEFAULT NULL,
+pc int DEFAULT NULL,
+INDEX idx_ct (ct),
+INDEX idx_pc (pc)
+);
+INSERT INTO t1 VALUES  
+(1,NULL,NULL),(2,NULL,NULL),(3,NULL,NULL),(4,NULL,NULL),(5,NULL,NULL);
+CREATE TABLE t2 (
+id int NOT NULL PRIMARY KEY,
+sr int NOT NULL,
+nm varchar(255) NOT NULL,
+INDEX idx_sr (sr)
+);
+INSERT INTO t2 VALUES
+(2441905,4308,'LesAbymes'),(2441906,4308,'Anse-Bertrand');
+CREATE TABLE t3 (
+id int NOT NULL PRIMARY KEY,
+ct int NOT NULL,
+ln int NOT NULL,
+INDEX idx_ct (ct),
+INDEX idx_ln (ln)
+);
+CREATE TABLE t4 (
+id int NOT NULL PRIMARY KEY,
+nm varchar(255) NOT NULL
+);
+INSERT INTO t4 VALUES (4308,'Guadeloupe'),(4309,'Martinique');
+SELECT t1.*
+FROM t1 LEFT JOIN
+(t2 LEFT JOIN t3 ON t3.ct=t2.id AND t3.ln='5') ON t1.ct=t2.id
+WHERE t1.id='5';
+id	ct	pc
+5	NULL	NULL
+SELECT t1.*, t4.nm
+FROM t1 LEFT JOIN
+(t2 LEFT JOIN t3 ON t3.ct=t2.id AND t3.ln='5') ON t1.ct=t2.id
+LEFT JOIN t4 ON t2.sr=t4.id
+WHERE t1.id='5';
+id	ct	pc	nm
+5	NULL	NULL	NULL
+DROP TABLE t1,t2,t3,t4;
+CREATE TABLE t1 (a INT, b INT);
+CREATE TABLE t2 (a INT);
+CREATE TABLE t3 (a INT, c INT);
+CREATE TABLE t4 (a INT, c INT);
+CREATE TABLE t5 (a INT, c INT);
+SELECT b FROM t1 JOIN (t2 LEFT JOIN t3 USING (a) LEFT JOIN t4 USING (a)
+LEFT JOIN t5 USING (a)) USING (a);
+b
+SELECT c FROM t1 JOIN (t2 LEFT JOIN t3 USING (a) LEFT JOIN t4 USING (a)
+LEFT JOIN t5 USING (a)) USING (a);
+ERROR 23000: Column 'c' in field list is ambiguous
+SELECT b FROM t1 JOIN (t2 JOIN t3 USING (a) JOIN t4 USING (a)
+JOIN t5 USING (a)) USING (a);
+b
+SELECT c FROM t1 JOIN (t2 JOIN t3 USING (a) JOIN t4 USING (a)
+JOIN t5 USING (a)) USING (a);
+ERROR 23000: Column 'c' in field list is ambiguous
+DROP TABLE t1,t2,t3,t4,t5;
+CREATE TABLE t1 (a INT, b INT);
+CREATE TABLE t2 (a INT, b INT);
+CREATE TABLE t3 (a INT, b INT);
+INSERT INTO t1 VALUES (1,1);
+INSERT INTO t2 VALUES (1,1);
+INSERT INTO t3 VALUES (1,1);
+SELECT * FROM t1 JOIN (t2 JOIN t3 USING (b)) USING (a);
+ERROR 23000: Column 'a' in from clause is ambiguous
+DROP TABLE t1,t2,t3;
+CREATE TABLE t1 (
+carrier char(2) default NULL,
+id int NOT NULL auto_increment PRIMARY KEY
+);
+INSERT INTO t1 VALUES
+('CO',235371754),('CO',235376554),('CO',235376884),('CO',235377874),
+('CO',231060394),('CO',231059224),('CO',231059314),('CO',231060484),
+('CO',231060274),('CO',231060124),('CO',231060244),('CO',231058594),
+('CO',231058924),('CO',231058504),('CO',231059344),('CO',231060424),
+('CO',231059554),('CO',231060304),('CO',231059644),('CO',231059464),
+('CO',231059764),('CO',231058294),('CO',231058624),('CO',231058864),
+('CO',231059374),('CO',231059584),('CO',231059734),('CO',231059014),
+('CO',231059854),('CO',231059494),('CO',231059794),('CO',231058534),
+('CO',231058324),('CO',231058684),('CO',231059524),('CO',231059974);
+CREATE TABLE t2 (
+scan_date date default NULL,
+package_id int default NULL,
+INDEX scan_date(scan_date),
+INDEX package_id(package_id)
+);
+INSERT INTO t2 VALUES
+('2008-12-29',231062944),('2008-12-29',231065764),('2008-12-29',231066124),
+('2008-12-29',231060094),('2008-12-29',231061054),('2008-12-29',231065644),
+('2008-12-29',231064384),('2008-12-29',231064444),('2008-12-29',231073774),
+('2008-12-29',231058594),('2008-12-29',231059374),('2008-12-29',231066004),
+('2008-12-29',231068494),('2008-12-29',231070174),('2008-12-29',231071884),
+('2008-12-29',231063274),('2008-12-29',231063754),('2008-12-29',231064144),
+('2008-12-29',231069424),('2008-12-29',231073714),('2008-12-29',231058414),
+('2008-12-29',231060994),('2008-12-29',231069154),('2008-12-29',231068614),
+('2008-12-29',231071464),('2008-12-29',231074014),('2008-12-29',231059614),
+('2008-12-29',231059074),('2008-12-29',231059464),('2008-12-29',231069094),
+('2008-12-29',231067294),('2008-12-29',231070144),('2008-12-29',231073804),
+('2008-12-29',231072634),('2008-12-29',231058294),('2008-12-29',231065344),
+('2008-12-29',231066094),('2008-12-29',231069034),('2008-12-29',231058594),
+('2008-12-29',231059854),('2008-12-29',231059884),('2008-12-29',231059914),
+('2008-12-29',231063664),('2008-12-29',231063814),('2008-12-29',231063904);
+CREATE TABLE t3 (
+package_id int default NULL,
+INDEX package_id(package_id)
+);
+INSERT INTO t3 VALUES
+(231058294),(231058324),(231058354),(231058384),(231058414),(231058444),
+(231058474),(231058504),(231058534),(231058564),(231058594),(231058624),
+(231058684),(231058744),(231058804),(231058864),(231058924),(231058954),
+(231059014),(231059074),(231059104),(231059134),(231059164),(231059194),
+(231059224),(231059254),(231059284),(231059314),(231059344),(231059374),
+(231059404),(231059434),(231059464),(231059494),(231059524),(231059554),
+(231059584),(231059614),(231059644),(231059674),(231059704),(231059734),
+(231059764),(231059794),(231059824),(231059854),(231059884),(231059914),
+(231059944),(231059974),(231060004),(231060034),(231060064),(231060094),
+(231060124),(231060154),(231060184),(231060214),(231060244),(231060274),
+(231060304),(231060334),(231060364),(231060394),(231060424),(231060454),
+(231060484),(231060514),(231060544),(231060574),(231060604),(231060634),
+(231060664),(231060694),(231060724),(231060754),(231060784),(231060814),
+(231060844),(231060874),(231060904),(231060934),(231060964),(231060994),
+(231061024),(231061054),(231061084),(231061144),(231061174),(231061204),
+(231061234),(231061294),(231061354),(231061384),(231061414),(231061474),
+(231061564),(231061594),(231061624),(231061684),(231061714),(231061774),
+(231061804),(231061894),(231061984),(231062074),(231062134),(231062224),
+(231062254),(231062314),(231062374),(231062434),(231062494),(231062554),
+(231062584),(231062614),(231062644),(231062704),(231062734),(231062794),
+(231062854),(231062884),(231062944),(231063004),(231063034),(231063064),
+(231063124),(231063154),(231063184),(231063214),(231063274),(231063334),
+(231063394),(231063424),(231063454),(231063514),(231063574),(231063664);
+CREATE TABLE t4 (
+carrier char(2) NOT NULL default '' PRIMARY KEY,
+id int(11) default NULL,
+INDEX id(id)
+);
+INSERT INTO t4 VALUES
+('99',6),('SK',456),('UA',486),('AI',1081),('OS',1111),('VS',1510);
+CREATE TABLE t5 (
+carrier_id int default NULL,
+INDEX carrier_id(carrier_id)
+);
+INSERT INTO t5 VALUES
+(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),
+(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),
+(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),
+(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),
+(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),
+(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),(6),(456),(456),(456),
+(456),(456),(456),(456),(456),(456),(456),(456),(456),(456),(456),(456),
+(456),(486),(1081),(1111),(1111),(1111),(1111),(1510);
+SELECT COUNT(*) 
+FROM((t2 JOIN t1 ON t2.package_id = t1.id) 
+JOIN t3 ON t3.package_id = t1.id);
+COUNT(*)
+6
+EXPLAIN
+SELECT COUNT(*) 
+FROM ((t2 JOIN t1 ON t2.package_id = t1.id) 
+JOIN t3 ON t3.package_id = t1.id)
+LEFT JOIN 
+(t5 JOIN t4 ON t5.carrier_id = t4.id)
+ON t4.carrier = t1.carrier;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t2	index	package_id	package_id	5	NULL	45	Using index
+1	SIMPLE	t1	eq_ref	PRIMARY	PRIMARY	4	test.t2.package_id	1	Using join buffer
+1	SIMPLE	t4	eq_ref	PRIMARY,id	PRIMARY	2	test.t1.carrier	1	
+1	SIMPLE	t5	ref	carrier_id	carrier_id	5	test.t4.id	22	Using index
+1	SIMPLE	t3	ref	package_id	package_id	5	test.t1.id	1	Using where; Using index
+SELECT COUNT(*) 
+FROM ((t2 JOIN t1 ON t2.package_id = t1.id) 
+JOIN t3 ON t3.package_id = t1.id)
+LEFT JOIN 
+(t5 JOIN t4 ON t5.carrier_id = t4.id)
+ON t4.carrier = t1.carrier;
+COUNT(*)
+6
+DROP TABLE t1,t2,t3,t4,t5;
+End of 5.0 tests
+CREATE TABLE t5 (a int, b int, c int, PRIMARY KEY(a), KEY b_i (b));
+CREATE TABLE t6 (a int, b int, c int, PRIMARY KEY(a), KEY b_i (b));
+CREATE TABLE t7 (a int, b int, c int, PRIMARY KEY(a), KEY b_i (b));
+CREATE TABLE t8 (a int, b int, c int, PRIMARY KEY(a), KEY b_i (b));
+INSERT INTO t5 VALUES (1,1,0), (2,2,0), (3,3,0);
+INSERT INTO t6 VALUES (1,2,0), (3,2,0), (6,1,0);
+INSERT INTO t7 VALUES (1,1,0), (2,2,0);
+INSERT INTO t8 VALUES (0,2,0), (1,2,0);
+EXPLAIN
+SELECT t5.a,t5.b,t6.a,t6.b,t7.a,t7.b,t8.a,t8.b
+FROM t5 
+LEFT JOIN 
+( 
+(t6, t7)
+LEFT JOIN 
+t8
+ON t7.b=t8.b AND t6.b < 10
+)
+ON t6.b >= 2 AND t5.b=t7.b AND
+(t8.a > 0 OR t8.c IS NULL);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t5	ALL	NULL	NULL	NULL	NULL	3	
+1	SIMPLE	t7	ref	b_i	b_i	5	test.t5.b	2	Using join buffer
+1	SIMPLE	t6	ALL	b_i	NULL	NULL	NULL	3	Using where; Using join buffer
+1	SIMPLE	t8	ref	b_i	b_i	5	test.t7.b	2	Using where; Using join buffer
+SELECT t5.a,t5.b,t6.a,t6.b,t7.a,t7.b,t8.a,t8.b
+FROM t5 
+LEFT JOIN 
+( 
+(t6, t7)
+LEFT JOIN 
+t8
+ON t7.b=t8.b AND t6.b < 10
+)
+ON t6.b >= 2 AND t5.b=t7.b AND
+(t8.a > 0 OR t8.c IS NULL);
+a	b	a	b	a	b	a	b
+2	2	1	2	2	2	1	2
+2	2	3	2	2	2	1	2
+1	1	1	2	1	1	NULL	NULL
+1	1	3	2	1	1	NULL	NULL
+3	3	NULL	NULL	NULL	NULL	NULL	NULL
+DELETE FROM t5;
+DELETE FROM t6;
+DELETE FROM t7;
+DELETE FROM t8;
+INSERT INTO t5 VALUES (1,3,0), (3,2,0);
+INSERT INTO t6 VALUES (3,3,0);
+INSERT INTO t7 VALUES (1,2,0);
+INSERT INTO t8 VALUES (1,1,0);
+EXPLAIN
+SELECT t5.a,t5.b,t6.a,t6.b,t7.a,t7.b,t8.a,t8.b
+FROM t5 LEFT JOIN                
+(t6 LEFT JOIN t7 ON t7.a=1, t8)
+ON (t5.b=t8.b);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t5	ALL	NULL	NULL	NULL	NULL	2	
+1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	1	Using join buffer
+1	SIMPLE	t7	const	PRIMARY	PRIMARY	4	const	1	Using join buffer
+1	SIMPLE	t8	ALL	b_i	NULL	NULL	NULL	1	Using where; Using join buffer
+SELECT t5.a,t5.b,t6.a,t6.b,t7.a,t7.b,t8.a,t8.b
+FROM t5 LEFT JOIN                
+(t6 LEFT JOIN t7 ON t7.a=1, t8)
+ON (t5.b=t8.b);
+a	b	a	b	a	b	a	b
+1	3	NULL	NULL	NULL	NULL	NULL	NULL
+3	2	NULL	NULL	NULL	NULL	NULL	NULL
+EXPLAIN
+SELECT t5.a,t5.b,t6.a,t6.b,t7.a,t7.b,t8.a,t8.b
+FROM t5 LEFT JOIN                
+(t6 LEFT JOIN t7 ON t7.b=2, t8)
+ON (t5.b=t8.b);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t5	ALL	NULL	NULL	NULL	NULL	2	
+1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	1	Using join buffer
+1	SIMPLE	t7	ref	b_i	b_i	5	const	0	Using join buffer
+1	SIMPLE	t8	ALL	b_i	NULL	NULL	NULL	1	Using where; Using join buffer
+SELECT t5.a,t5.b,t6.a,t6.b,t7.a,t7.b,t8.a,t8.b
+FROM t5 LEFT JOIN                
+(t6 LEFT JOIN t7 ON t7.b=2, t8)
+ON (t5.b=t8.b);
+a	b	a	b	a	b	a	b
+1	3	NULL	NULL	NULL	NULL	NULL	NULL
+3	2	NULL	NULL	NULL	NULL	NULL	NULL
+EXPLAIN
+SELECT t5.a,t5.b,t6.a,t6.b,t7.a,t7.b,t8.a,t8.b
+FROM t5 LEFT JOIN                
+(t8, t6 LEFT JOIN t7 ON t7.a=1)
+ON (t5.b=t8.b);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t5	ALL	NULL	NULL	NULL	NULL	2	
+1	SIMPLE	t8	ALL	b_i	NULL	NULL	NULL	1	Using where; Using join buffer
+1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	1	Using join buffer
+1	SIMPLE	t7	const	PRIMARY	PRIMARY	4	const	1	Using join buffer
+SELECT t5.a,t5.b,t6.a,t6.b,t7.a,t7.b,t8.a,t8.b
+FROM t5 LEFT JOIN                
+(t8, t6 LEFT JOIN t7 ON t7.a=1)
+ON (t5.b=t8.b);
+a	b	a	b	a	b	a	b
+1	3	NULL	NULL	NULL	NULL	NULL	NULL
+3	2	NULL	NULL	NULL	NULL	NULL	NULL
+DROP TABLE t5,t6,t7,t8;
+set join_cache_level=default;
+show variables like 'join_cache_level';
+Variable_name	Value
+join_cache_level	1

=== modified file 'mysql-test/r/join_outer.result'
--- a/mysql-test/r/join_outer.result	2009-12-15 07:16:46 +0000
+++ b/mysql-test/r/join_outer.result	2009-12-21 02:26:15 +0000
@@ -859,14 +859,14 @@ a1	a2
 EXPLAIN SELECT * FROM t1 LEFT JOIN t2 ON a1=0;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	system	NULL	NULL	NULL	NULL	1	
-1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	2	
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	2	Using where
 SELECT * FROM t1 LEFT JOIN (t2,t3) ON a1=0;
 a1	a2	a3
 1	NULL	NULL
 EXPLAIN SELECT * FROM t1 LEFT JOIN (t2,t3) ON a1=0;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	system	NULL	NULL	NULL	NULL	1	
-1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	2	
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	2	Using where
 1	SIMPLE	t3	ALL	NULL	NULL	NULL	NULL	2	
 SELECT * FROM t0, t1 LEFT JOIN (t2,t3) ON a1=0 WHERE a0=a1;
 a0	a1	a2	a3
@@ -875,7 +875,7 @@ EXPLAIN SELECT * FROM t0, t1 LEFT JOIN (
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t0	system	PRIMARY	NULL	NULL	NULL	1	
 1	SIMPLE	t1	system	PRIMARY	NULL	NULL	NULL	1	
-1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	2	
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	2	Using where
 1	SIMPLE	t3	ALL	NULL	NULL	NULL	NULL	2	
 INSERT INTO t0 VALUES (0);
 INSERT INTO t1 VALUES (0);
@@ -886,7 +886,7 @@ EXPLAIN SELECT * FROM t0, t1 LEFT JOIN (
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t0	const	PRIMARY	PRIMARY	4	const	1	Using index
 1	SIMPLE	t1	const	PRIMARY	PRIMARY	4	const	1	Using index
-1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	2	
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	2	Using where
 1	SIMPLE	t3	ALL	NULL	NULL	NULL	NULL	2	
 drop table t1,t2;
 create table t1 (a int, b int);

=== added file 'mysql-test/r/join_outer_jcl6.result'
--- a/mysql-test/r/join_outer_jcl6.result	1970-01-01 00:00:00 +0000
+++ b/mysql-test/r/join_outer_jcl6.result	2009-12-21 02:26:15 +0000
@@ -0,0 +1,1264 @@
+set join_cache_level=6;
+show variables like 'join_cache_level';
+Variable_name	Value
+join_cache_level	6
+drop table if exists t0,t1,t2,t3,t4,t5;
+CREATE TABLE t1 (
+grp int(11) default NULL,
+a bigint(20) unsigned default NULL,
+c char(10) NOT NULL default ''
+) ENGINE=MyISAM;
+INSERT INTO t1 VALUES (1,1,'a'),(2,2,'b'),(2,3,'c'),(3,4,'E'),(3,5,'C'),(3,6,'D'),(NULL,NULL,'');
+create table t2 (id int, a bigint unsigned not null, c char(10), d int, primary key (a));
+insert into t2 values (1,1,"a",1),(3,4,"A",4),(3,5,"B",5),(3,6,"C",6),(4,7,"D",7);
+select t1.*,t2.* from t1 JOIN t2 where t1.a=t2.a;
+grp	a	c	id	a	c	d
+1	1	a	1	1	a	1
+3	4	E	3	4	A	4
+3	5	C	3	5	B	5
+3	6	D	3	6	C	6
+select t1.*,t2.* from t1 left join t2 on (t1.a=t2.a) order by t1.grp,t1.a,t2.c;
+grp	a	c	id	a	c	d
+NULL	NULL		NULL	NULL	NULL	NULL
+1	1	a	1	1	a	1
+2	2	b	NULL	NULL	NULL	NULL
+2	3	c	NULL	NULL	NULL	NULL
+3	4	E	3	4	A	4
+3	5	C	3	5	B	5
+3	6	D	3	6	C	6
+select t1.*,t2.* from { oj t2 left outer join t1 on (t1.a=t2.a) };
+grp	a	c	id	a	c	d
+1	1	a	1	1	a	1
+3	4	E	3	4	A	4
+3	5	C	3	5	B	5
+3	6	D	3	6	C	6
+NULL	NULL	NULL	4	7	D	7
+select t1.*,t2.* from t1 as t0,{ oj t2 left outer join t1 on (t1.a=t2.a) } WHERE t0.a=2;
+grp	a	c	id	a	c	d
+1	1	a	1	1	a	1
+3	4	E	3	4	A	4
+3	5	C	3	5	B	5
+3	6	D	3	6	C	6
+NULL	NULL	NULL	4	7	D	7
+select t1.*,t2.* from t1 left join t2 using (a);
+grp	a	c	id	a	c	d
+1	1	a	1	1	a	1
+3	4	E	3	4	A	4
+3	5	C	3	5	B	5
+3	6	D	3	6	C	6
+2	2	b	NULL	NULL	NULL	NULL
+2	3	c	NULL	NULL	NULL	NULL
+NULL	NULL		NULL	NULL	NULL	NULL
+select t1.*,t2.* from t1 left join t2 using (a) where t1.a=t2.a;
+grp	a	c	id	a	c	d
+1	1	a	1	1	a	1
+3	4	E	3	4	A	4
+3	5	C	3	5	B	5
+3	6	D	3	6	C	6
+select t1.*,t2.* from t1 left join t2 using (a,c);
+grp	a	c	id	a	c	d
+1	1	a	1	1	a	1
+2	2	b	NULL	NULL	NULL	NULL
+2	3	c	NULL	NULL	NULL	NULL
+3	4	E	NULL	NULL	NULL	NULL
+3	5	C	NULL	NULL	NULL	NULL
+3	6	D	NULL	NULL	NULL	NULL
+NULL	NULL		NULL	NULL	NULL	NULL
+select t1.*,t2.* from t1 left join t2 using (c);
+grp	a	c	id	a	c	d
+1	1	a	1	1	a	1
+1	1	a	3	4	A	4
+2	2	b	3	5	B	5
+2	3	c	3	6	C	6
+3	5	C	3	6	C	6
+3	6	D	4	7	D	7
+3	4	E	NULL	NULL	NULL	NULL
+NULL	NULL		NULL	NULL	NULL	NULL
+select t1.*,t2.* from t1 natural left outer join t2;
+grp	a	c	id	a	c	d
+1	1	a	1	1	a	1
+2	2	b	NULL	NULL	NULL	NULL
+2	3	c	NULL	NULL	NULL	NULL
+3	4	E	NULL	NULL	NULL	NULL
+3	5	C	NULL	NULL	NULL	NULL
+3	6	D	NULL	NULL	NULL	NULL
+NULL	NULL		NULL	NULL	NULL	NULL
+select t1.*,t2.* from t1 left join t2 on (t1.a=t2.a) where t2.id=3;
+grp	a	c	id	a	c	d
+3	4	E	3	4	A	4
+3	5	C	3	5	B	5
+3	6	D	3	6	C	6
+select t1.*,t2.* from t1 left join t2 on (t1.a=t2.a) where t2.id is null;
+grp	a	c	id	a	c	d
+2	2	b	NULL	NULL	NULL	NULL
+2	3	c	NULL	NULL	NULL	NULL
+NULL	NULL		NULL	NULL	NULL	NULL
+explain select t1.*,t2.* from t1,t2 where t1.a=t2.a and isnull(t2.a)=1;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE
+explain select t1.*,t2.* from t1 left join t2 on t1.a=t2.a where isnull(t2.a)=1;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	7	
+1	SIMPLE	t2	eq_ref	PRIMARY	PRIMARY	8	test.t1.a	1	Using where; Using join buffer
+select t1.*,t2.*,t3.a from t1 left join t2 on (t1.a=t2.a) left join t1 as t3 on (t2.a=t3.a);
+grp	a	c	id	a	c	d	a
+1	1	a	1	1	a	1	1
+3	4	E	3	4	A	4	4
+3	5	C	3	5	B	5	5
+3	6	D	3	6	C	6	6
+2	2	b	NULL	NULL	NULL	NULL	NULL
+2	3	c	NULL	NULL	NULL	NULL	NULL
+NULL	NULL		NULL	NULL	NULL	NULL	NULL
+explain select t1.*,t2.*,t3.a from t1 left join t2 on (t3.a=t2.a) left join t1 as t3 on (t1.a=t3.a);
+ERROR 42S22: Unknown column 't3.a' in 'on clause'
+select t1.*,t2.*,t3.a from t1 left join t2 on (t3.a=t2.a) left join t1 as t3 on (t1.a=t3.a);
+ERROR 42S22: Unknown column 't3.a' in 'on clause'
+select t1.*,t2.*,t3.a from t1 left join t2 on (t3.a=t2.a) left join t1 as t3 on (t2.a=t3.a);
+ERROR 42S22: Unknown column 't3.a' in 'on clause'
+select t1.*,t2.* from t1 inner join t2 using (a);
+grp	a	c	id	a	c	d
+1	1	a	1	1	a	1
+3	4	E	3	4	A	4
+3	5	C	3	5	B	5
+3	6	D	3	6	C	6
+select t1.*,t2.* from t1 inner join t2 on (t1.a=t2.a);
+grp	a	c	id	a	c	d
+1	1	a	1	1	a	1
+3	4	E	3	4	A	4
+3	5	C	3	5	B	5
+3	6	D	3	6	C	6
+select t1.*,t2.* from t1 natural join t2;
+grp	a	c	id	a	c	d
+1	1	a	1	1	a	1
+drop table t1,t2;
+CREATE TABLE t1 (
+usr_id INT unsigned NOT NULL,
+uniq_id INT unsigned NOT NULL AUTO_INCREMENT,
+start_num INT unsigned NOT NULL DEFAULT 1,
+increment INT unsigned NOT NULL DEFAULT 1,
+PRIMARY KEY (uniq_id),
+INDEX usr_uniq_idx (usr_id, uniq_id),
+INDEX uniq_usr_idx (uniq_id, usr_id)
+);
+CREATE TABLE t2 (
+id INT unsigned NOT NULL DEFAULT 0,
+usr2_id INT unsigned NOT NULL DEFAULT 0,
+max INT unsigned NOT NULL DEFAULT 0,
+c_amount INT unsigned NOT NULL DEFAULT 0,
+d_max INT unsigned NOT NULL DEFAULT 0,
+d_num INT unsigned NOT NULL DEFAULT 0,
+orig_time INT unsigned NOT NULL DEFAULT 0,
+c_time INT unsigned NOT NULL DEFAULT 0,
+active ENUM ("no","yes") NOT NULL,
+PRIMARY KEY (id,usr2_id),
+INDEX id_idx (id),
+INDEX usr2_idx (usr2_id)
+);
+INSERT INTO t1 VALUES (3,NULL,0,50),(3,NULL,0,200),(3,NULL,0,25),(3,NULL,0,84676),(3,NULL,0,235),(3,NULL,0,10),(3,NULL,0,3098),(3,NULL,0,2947),(3,NULL,0,8987),(3,NULL,0,8347654),(3,NULL,0,20398),(3,NULL,0,8976),(3,NULL,0,500),(3,NULL,0,198);
+SELECT t1.usr_id,t1.uniq_id,t1.increment,
+t2.usr2_id,t2.c_amount,t2.max
+FROM t1
+LEFT JOIN t2 ON t2.id = t1.uniq_id
+WHERE t1.uniq_id = 4
+ORDER BY t2.c_amount;
+usr_id	uniq_id	increment	usr2_id	c_amount	max
+3	4	84676	NULL	NULL	NULL
+SELECT t1.usr_id,t1.uniq_id,t1.increment,
+t2.usr2_id,t2.c_amount,t2.max
+FROM t2
+RIGHT JOIN t1 ON t2.id = t1.uniq_id
+WHERE t1.uniq_id = 4
+ORDER BY t2.c_amount;
+usr_id	uniq_id	increment	usr2_id	c_amount	max
+3	4	84676	NULL	NULL	NULL
+INSERT INTO t2 VALUES (2,3,3000,6000,0,0,746584,837484,'yes');
+INSERT INTO t2 VALUES (2,3,3000,6000,0,0,746584,837484,'yes');
+ERROR 23000: Duplicate entry '2-3' for key 'PRIMARY'
+INSERT INTO t2 VALUES (7,3,1000,2000,0,0,746294,937484,'yes');
+SELECT t1.usr_id,t1.uniq_id,t1.increment,t2.usr2_id,t2.c_amount,t2.max FROM t1 LEFT JOIN t2 ON t2.id = t1.uniq_id WHERE t1.uniq_id = 4 ORDER BY t2.c_amount;
+usr_id	uniq_id	increment	usr2_id	c_amount	max
+3	4	84676	NULL	NULL	NULL
+SELECT t1.usr_id,t1.uniq_id,t1.increment,t2.usr2_id,t2.c_amount,t2.max FROM t1 LEFT JOIN t2 ON t2.id = t1.uniq_id WHERE t1.uniq_id = 4 GROUP BY t2.c_amount;
+usr_id	uniq_id	increment	usr2_id	c_amount	max
+3	4	84676	NULL	NULL	NULL
+SELECT t1.usr_id,t1.uniq_id,t1.increment,t2.usr2_id,t2.c_amount,t2.max FROM t1 LEFT JOIN t2 ON t2.id = t1.uniq_id WHERE t1.uniq_id = 4;
+usr_id	uniq_id	increment	usr2_id	c_amount	max
+3	4	84676	NULL	NULL	NULL
+drop table t1,t2;
+CREATE TABLE t1 (
+cod_asig int(11) DEFAULT '0' NOT NULL,
+desc_larga_cat varchar(80) DEFAULT '' NOT NULL,
+desc_larga_cas varchar(80) DEFAULT '' NOT NULL,
+desc_corta_cat varchar(40) DEFAULT '' NOT NULL,
+desc_corta_cas varchar(40) DEFAULT '' NOT NULL,
+cred_total double(3,1) DEFAULT '0.0' NOT NULL,
+pre_requisit int(11),
+co_requisit int(11),
+preco_requisit int(11),
+PRIMARY KEY (cod_asig)
+);
+INSERT INTO t1 VALUES (10360,'asdfggfg','Introduccion a los  Ordenadores I','asdfggfg','Introduccio Ordinadors I',6.0,NULL,NULL,NULL);
+INSERT INTO t1 VALUES (10361,'Components i Circuits Electronics I','Componentes y Circuitos Electronicos I','Components i Circuits Electronics I','Comp. i Circ. Electr. I',6.0,NULL,NULL,NULL);
+INSERT INTO t1 VALUES (10362,'Laboratori d`Ordinadors','Laboratorio de Ordenadores','Laboratori d`Ordinadors','Laboratori Ordinadors',4.5,NULL,NULL,NULL);
+INSERT INTO t1 VALUES (10363,'Tecniques de Comunicacio Oral i Escrita','Tecnicas de Comunicacion Oral y Escrita','Tecniques de Comunicacio Oral i Escrita','Tec. Com. Oral i Escrita',4.5,NULL,NULL,NULL);
+INSERT INTO t1 VALUES (11403,'Projecte Fi de Carrera','Proyecto Fin de Carrera','Projecte Fi de Carrera','PFC',9.0,NULL,NULL,NULL);
+INSERT INTO t1 VALUES (11404,'+lgebra lineal','Algebra lineal','+lgebra lineal','+lgebra lineal',15.0,NULL,NULL,NULL);
+INSERT INTO t1 VALUES (11405,'+lgebra lineal','Algebra lineal','+lgebra lineal','+lgebra lineal',18.0,NULL,NULL,NULL);
+INSERT INTO t1 VALUES (11406,'Calcul Infinitesimal','Cßlculo Infinitesimal','Calcul Infinitesimal','Calcul Infinitesimal',15.0,NULL,NULL,NULL);
+CREATE TABLE t2 (
+idAssignatura int(11) DEFAULT '0' NOT NULL,
+Grup int(11) DEFAULT '0' NOT NULL,
+Places smallint(6) DEFAULT '0' NOT NULL,
+PlacesOcupades int(11) DEFAULT '0',
+PRIMARY KEY (idAssignatura,Grup)
+);
+INSERT INTO t2 VALUES (10360,12,333,0);
+INSERT INTO t2 VALUES (10361,30,2,0);
+INSERT INTO t2 VALUES (10361,40,3,0);
+INSERT INTO t2 VALUES (10360,45,10,0);
+INSERT INTO t2 VALUES (10362,10,12,0);
+INSERT INTO t2 VALUES (10360,55,2,0);
+INSERT INTO t2 VALUES (10360,70,0,0);
+INSERT INTO t2 VALUES (10360,565656,0,0);
+INSERT INTO t2 VALUES (10360,32767,7,0);
+INSERT INTO t2 VALUES (10360,33,8,0);
+INSERT INTO t2 VALUES (10360,7887,85,0);
+INSERT INTO t2 VALUES (11405,88,8,0);
+INSERT INTO t2 VALUES (10360,0,55,0);
+INSERT INTO t2 VALUES (10360,99,0,0);
+INSERT INTO t2 VALUES (11411,30,10,0);
+INSERT INTO t2 VALUES (11404,0,0,0);
+INSERT INTO t2 VALUES (10362,11,111,0);
+INSERT INTO t2 VALUES (10363,33,333,0);
+INSERT INTO t2 VALUES (11412,55,0,0);
+INSERT INTO t2 VALUES (50003,66,6,0);
+INSERT INTO t2 VALUES (11403,5,0,0);
+INSERT INTO t2 VALUES (11406,11,11,0);
+INSERT INTO t2 VALUES (11410,11410,131,0);
+INSERT INTO t2 VALUES (11416,11416,32767,0);
+INSERT INTO t2 VALUES (11409,0,0,0);
+CREATE TABLE t3 (
+id int(11) NOT NULL auto_increment,
+dni_pasaporte char(16) DEFAULT '' NOT NULL,
+idPla int(11) DEFAULT '0' NOT NULL,
+cod_asig int(11) DEFAULT '0' NOT NULL,
+any smallint(6) DEFAULT '0' NOT NULL,
+quatrimestre smallint(6) DEFAULT '0' NOT NULL,
+estat char(1) DEFAULT 'M' NOT NULL,
+PRIMARY KEY (id),
+UNIQUE dni_pasaporte (dni_pasaporte,idPla),
+UNIQUE dni_pasaporte_2 (dni_pasaporte,idPla,cod_asig,any,quatrimestre)
+);
+INSERT INTO t3 VALUES (1,'11111111',1,10362,98,1,'M');
+CREATE TABLE t4 (
+id int(11) NOT NULL auto_increment,
+papa int(11) DEFAULT '0' NOT NULL,
+fill int(11) DEFAULT '0' NOT NULL,
+idPla int(11) DEFAULT '0' NOT NULL,
+PRIMARY KEY (id),
+KEY papa (idPla,papa),
+UNIQUE papa_2 (idPla,papa,fill)
+);
+INSERT INTO t4 VALUES (1,-1,10360,1);
+INSERT INTO t4 VALUES (2,-1,10361,1);
+INSERT INTO t4 VALUES (3,-1,10362,1);
+SELECT DISTINCT fill,desc_larga_cat,cred_total,Grup,Places,PlacesOcupades FROM t4 LEFT JOIN t3 ON t3.cod_asig=fill AND estat='S'   AND dni_pasaporte='11111111'   AND t3.idPla=1 , t2,t1 WHERE fill=t1.cod_asig   AND Places>PlacesOcupades   AND fill=idAssignatura   AND t4.idPla=1   AND papa=-1;
+fill	desc_larga_cat	cred_total	Grup	Places	PlacesOcupades
+10360	asdfggfg	6.0	12	333	0
+10361	Components i Circuits Electronics I	6.0	30	2	0
+10361	Components i Circuits Electronics I	6.0	40	3	0
+10360	asdfggfg	6.0	45	10	0
+10362	Laboratori d`Ordinadors	4.5	10	12	0
+10360	asdfggfg	6.0	55	2	0
+10360	asdfggfg	6.0	32767	7	0
+10360	asdfggfg	6.0	33	8	0
+10360	asdfggfg	6.0	7887	85	0
+10360	asdfggfg	6.0	0	55	0
+10362	Laboratori d`Ordinadors	4.5	11	111	0
+SELECT DISTINCT fill,t3.idPla FROM t4 LEFT JOIN t3 ON t3.cod_asig=t4.fill AND t3.estat='S' AND t3.dni_pasaporte='1234' AND t3.idPla=1 ;
+fill	idPla
+10360	NULL
+10361	NULL
+10362	NULL
+INSERT INTO t3 VALUES (3,'1234',1,10360,98,1,'S');
+SELECT DISTINCT fill,t3.idPla FROM t4 LEFT JOIN t3 ON t3.cod_asig=t4.fill AND t3.estat='S' AND t3.dni_pasaporte='1234' AND t3.idPla=1 ;
+fill	idPla
+10360	1
+10361	NULL
+10362	NULL
+drop table t1,t2,t3,test.t4;
+CREATE TABLE t1 (
+id smallint(5) unsigned NOT NULL auto_increment,
+name char(60) DEFAULT '' NOT NULL,
+PRIMARY KEY (id)
+);
+INSERT INTO t1 VALUES (1,'Antonio Paz');
+INSERT INTO t1 VALUES (2,'Lilliana Angelovska');
+INSERT INTO t1 VALUES (3,'Thimble Smith');
+CREATE TABLE t2 (
+id smallint(5) unsigned NOT NULL auto_increment,
+owner smallint(5) unsigned DEFAULT '0' NOT NULL,
+name char(60),
+PRIMARY KEY (id)
+);
+INSERT INTO t2 VALUES (1,1,'El Gato');
+INSERT INTO t2 VALUES (2,1,'Perrito');
+INSERT INTO t2 VALUES (3,3,'Happy');
+select t1.name, t2.name, t2.id from t1 left join t2 on (t1.id = t2.owner);
+name	name	id
+Antonio Paz	El Gato	1
+Antonio Paz	Perrito	2
+Thimble Smith	Happy	3
+Lilliana Angelovska	NULL	NULL
+select t1.name, t2.name, t2.id from t1 left join t2 on (t1.id = t2.owner) where t2.id is null;
+name	name	id
+Lilliana Angelovska	NULL	NULL
+explain select t1.name, t2.name, t2.id from t1 left join t2 on (t1.id = t2.owner) where t2.id is null;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	3	Using where; Not exists; Using join buffer
+explain select t1.name, t2.name, t2.id from t1 left join t2 on (t1.id = t2.owner) where t2.name is null;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	3	Using where; Using join buffer
+select count(*) from t1 left join t2 on (t1.id = t2.owner);
+count(*)
+4
+select t1.name, t2.name, t2.id from t2 right join t1 on (t1.id = t2.owner);
+name	name	id
+Antonio Paz	El Gato	1
+Antonio Paz	Perrito	2
+Thimble Smith	Happy	3
+Lilliana Angelovska	NULL	NULL
+select t1.name, t2.name, t2.id from t2 right join t1 on (t1.id = t2.owner) where t2.id is null;
+name	name	id
+Lilliana Angelovska	NULL	NULL
+explain select t1.name, t2.name, t2.id from t2 right join t1 on (t1.id = t2.owner) where t2.id is null;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	3	Using where; Not exists; Using join buffer
+explain select t1.name, t2.name, t2.id from t2 right join t1 on (t1.id = t2.owner) where t2.name is null;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	3	Using where; Using join buffer
+select count(*) from t2 right join t1 on (t1.id = t2.owner);
+count(*)
+4
+select t1.name, t2.name, t2.id,t3.id from t2 right join t1 on (t1.id = t2.owner) left join t1 as t3 on t3.id=t2.owner;
+name	name	id	id
+Antonio Paz	El Gato	1	1
+Antonio Paz	Perrito	2	1
+Thimble Smith	Happy	3	3
+Lilliana Angelovska	NULL	NULL	NULL
+select t1.name, t2.name, t2.id,t3.id from t1 right join t2 on (t1.id = t2.owner) right join t1 as t3 on t3.id=t2.owner;
+name	name	id	id
+Antonio Paz	El Gato	1	1
+Antonio Paz	Perrito	2	1
+Thimble Smith	Happy	3	3
+NULL	NULL	NULL	2
+select t1.name, t2.name, t2.id, t2.owner, t3.id from t1 left join t2 on (t1.id = t2.owner) right join t1 as t3 on t3.id=t2.owner;
+name	name	id	owner	id
+Antonio Paz	El Gato	1	1	1
+Antonio Paz	Perrito	2	1	1
+Thimble Smith	Happy	3	3	3
+NULL	NULL	NULL	NULL	2
+drop table t1,t2;
+create table t1 (id int not null, str char(10), index(str));
+insert into t1 values (1, null), (2, null), (3, "foo"), (4, "bar");
+select * from t1 where str is not null order by id;
+id	str
+3	foo
+4	bar
+select * from t1 where str is null;
+id	str
+1	NULL
+2	NULL
+drop table t1;
+CREATE TABLE t1 (
+t1_id bigint(21) NOT NULL auto_increment,
+PRIMARY KEY (t1_id)
+);
+CREATE TABLE t2 (
+t2_id bigint(21) NOT NULL auto_increment,
+PRIMARY KEY (t2_id)
+);
+CREATE TABLE t3 (
+t3_id bigint(21) NOT NULL auto_increment,
+PRIMARY KEY (t3_id)
+);
+CREATE TABLE t4 (
+seq_0_id bigint(21) DEFAULT '0' NOT NULL,
+seq_1_id bigint(21) DEFAULT '0' NOT NULL,
+KEY seq_0_id (seq_0_id),
+KEY seq_1_id (seq_1_id)
+);
+CREATE TABLE t5 (
+seq_0_id bigint(21) DEFAULT '0' NOT NULL,
+seq_1_id bigint(21) DEFAULT '0' NOT NULL,
+KEY seq_1_id (seq_1_id),
+KEY seq_0_id (seq_0_id)
+);
+insert into t1 values (1);
+insert into t2 values (1);
+insert into t3 values (1);
+insert into t4 values (1,1);
+insert into t5 values (1,1);
+explain select * from t3 left join t4 on t4.seq_1_id = t2.t2_id left join t1 on t1.t1_id = t4.seq_0_id left join t5 on t5.seq_0_id = t1.t1_id left join t2 on t2.t2_id = t5.seq_1_id where t3.t3_id = 23;
+ERROR 42S22: Unknown column 't2.t2_id' in 'on clause'
+drop table t1,t2,t3,t4,t5;
+create table t1 (n int, m int, o int, key(n));
+create table t2 (n int not null, m int, o int, primary key(n));
+insert into t1 values (1, 2, 11), (1, 2, 7), (2, 2, 8), (1,2,9),(1,3,9);
+insert into t2 values (1, 2, 3),(2, 2, 8), (4,3,9),(3,2,10);
+select t1.*, t2.* from t1 left join t2 on t1.n = t2.n and
+t1.m = t2.m where t1.n = 1;
+n	m	o	n	m	o
+1	2	11	1	2	3
+1	2	7	1	2	3
+1	2	9	1	2	3
+1	3	9	NULL	NULL	NULL
+select t1.*, t2.* from t1 left join t2 on t1.n = t2.n and
+t1.m = t2.m where t1.n = 1 order by t1.o;
+n	m	o	n	m	o
+1	2	7	1	2	3
+1	2	9	1	2	3
+1	3	9	NULL	NULL	NULL
+1	2	11	1	2	3
+drop table t1,t2;
+CREATE TABLE t1 (id1 INT NOT NULL PRIMARY KEY, dat1 CHAR(1), id2 INT);
+INSERT INTO t1 VALUES (1,'a',1);
+INSERT INTO t1 VALUES (2,'b',1);
+INSERT INTO t1 VALUES (3,'c',2);
+CREATE TABLE t2 (id2 INT NOT NULL PRIMARY KEY, dat2 CHAR(1));
+INSERT INTO t2 VALUES (1,'x');
+INSERT INTO t2 VALUES (2,'y');
+INSERT INTO t2 VALUES (3,'z');
+SELECT t2.id2 FROM t2 LEFT OUTER JOIN t1 ON t1.id2 = t2.id2 WHERE id1 IS NULL;
+id2
+3
+SELECT t2.id2 FROM t2 NATURAL LEFT OUTER JOIN t1 WHERE id1 IS NULL;
+id2
+3
+drop table t1,t2;
+create table t1 ( color varchar(20), name varchar(20) );
+insert into t1 values ( 'red', 'apple' );
+insert into t1 values ( 'yellow', 'banana' );
+insert into t1 values ( 'green', 'lime' );
+insert into t1 values ( 'black', 'grape' );
+insert into t1 values ( 'blue', 'blueberry' );
+create table t2 ( count int, color varchar(20) );
+insert into t2 values (10, 'green');
+insert into t2 values (5, 'black');
+insert into t2 values (15, 'white');
+insert into t2 values (7, 'green');
+select * from t1;
+color	name
+red	apple
+yellow	banana
+green	lime
+black	grape
+blue	blueberry
+select * from t2;
+count	color
+10	green
+5	black
+15	white
+7	green
+select * from t2 natural join t1;
+color	count	name
+green	10	lime
+green	7	lime
+black	5	grape
+select t2.count, t1.name from t2 natural join t1;
+count	name
+10	lime
+7	lime
+5	grape
+select t2.count, t1.name from t2 inner join t1 using (color);
+count	name
+10	lime
+7	lime
+5	grape
+drop table t1;
+drop table t2;
+CREATE TABLE t1 (
+pcode varchar(8) DEFAULT '' NOT NULL
+);
+INSERT INTO t1 VALUES ('kvw2000'),('kvw2001'),('kvw3000'),('kvw3001'),('kvw3002'),('kvw3500'),('kvw3501'),('kvw3502'),('kvw3800'),('kvw3801'),('kvw3802'),('kvw3900'),('kvw3901'),('kvw3902'),('kvw4000'),('kvw4001'),('kvw4002'),('kvw4200'),('kvw4500'),('kvw5000'),('kvw5001'),('kvw5500'),('kvw5510'),('kvw5600'),('kvw5601'),('kvw6000'),('klw1000'),('klw1020'),('klw1500'),('klw2000'),('klw2001'),('klw2002'),('kld2000'),('klw2500'),('kmw1000'),('kmw1500'),('kmw2000'),('kmw2001'),('kmw2100'),('kmw3000'),('kmw3200');
+CREATE TABLE t2 (
+pcode varchar(8) DEFAULT '' NOT NULL,
+KEY pcode (pcode)
+);
+INSERT INTO t2 VALUES ('kvw2000'),('kvw2000'),('kvw2000'),('kvw2000'),('kvw2000'),('kvw2000'),('kvw2000'),('kvw2000'),('kvw2000'),('kvw2000'),('kvw2000'),('kvw2000'),('kvw2000'),('kvw2000'),('kvw2000'),('kvw2000'),('kvw2000'),('kvw2000'),('kvw2000'),('kvw2000'),('kvw2000'),('kvw2000'),('kvw2000'),('kvw2000'),('kvw2000'),('kvw2000'),('kvw3000'),('kvw3000'),('kvw3000'),('kvw3000'),('kvw3000'),('kvw3000'),('kvw3000'),('kvw3000'),('kvw3000'),('kvw3000'),('kvw3000'),('kvw3000'),('kvw3000'),('kvw3000'),('kvw3000'),('kvw3000'),('kvw3000'),('kvw3000'),('kvw3000'),('kvw3000'),('kvw3000'),('kvw3000'),('kvw3000'),('kvw3000'),('kvw3000'),('kvw3000'),('kvw3000'),('kvw3000'),('kvw3000'),('kvw3000'),('kvw3000'),('kvw3000'),('kvw3000'),('kvw3000'),('kvw3000'),('kvw3000'),('kvw3500'),('kvw3500'),('kvw3500'),('kvw3500'),('kvw3500'),('kvw3500'),('kvw3500'),('kvw3500'),('kvw3500'),('kvw3500'),('kvw3500'),('kvw3500'),('kvw3500'),('kvw3500'),('kvw3500'),('kvw3500'),('kvw3500'),('kvw3500'),('kvw3500'),('kvw3500'),('kvw3500'),('kvw3500'),('kvw3500'),('kvw3500'),('kvw3500'),('kvw3500'),('kvw6000'),('kvw6000'),('kld2000');
+SELECT t1.pcode, IF(ISNULL(t2.pcode), 0, COUNT(*)) AS count FROM t1
+LEFT JOIN t2 ON t1.pcode = t2.pcode GROUP BY t1.pcode;
+pcode	count
+kld2000	1
+klw1000	0
+klw1020	0
+klw1500	0
+klw2000	0
+klw2001	0
+klw2002	0
+klw2500	0
+kmw1000	0
+kmw1500	0
+kmw2000	0
+kmw2001	0
+kmw2100	0
+kmw3000	0
+kmw3200	0
+kvw2000	26
+kvw2001	0
+kvw3000	36
+kvw3001	0
+kvw3002	0
+kvw3500	26
+kvw3501	0
+kvw3502	0
+kvw3800	0
+kvw3801	0
+kvw3802	0
+kvw3900	0
+kvw3901	0
+kvw3902	0
+kvw4000	0
+kvw4001	0
+kvw4002	0
+kvw4200	0
+kvw4500	0
+kvw5000	0
+kvw5001	0
+kvw5500	0
+kvw5510	0
+kvw5600	0
+kvw5601	0
+kvw6000	2
+SELECT SQL_BIG_RESULT t1.pcode, IF(ISNULL(t2.pcode), 0, COUNT(*)) AS count FROM t1 LEFT JOIN t2 ON t1.pcode = t2.pcode GROUP BY t1.pcode;
+pcode	count
+kld2000	1
+klw1000	0
+klw1020	0
+klw1500	0
+klw2000	0
+klw2001	0
+klw2002	0
+klw2500	0
+kmw1000	0
+kmw1500	0
+kmw2000	0
+kmw2001	0
+kmw2100	0
+kmw3000	0
+kmw3200	0
+kvw2000	26
+kvw2001	0
+kvw3000	36
+kvw3001	0
+kvw3002	0
+kvw3500	26
+kvw3501	0
+kvw3502	0
+kvw3800	0
+kvw3801	0
+kvw3802	0
+kvw3900	0
+kvw3901	0
+kvw3902	0
+kvw4000	0
+kvw4001	0
+kvw4002	0
+kvw4200	0
+kvw4500	0
+kvw5000	0
+kvw5001	0
+kvw5500	0
+kvw5510	0
+kvw5600	0
+kvw5601	0
+kvw6000	2
+drop table t1,t2;
+CREATE TABLE t1 (
+id int(11),
+pid int(11),
+rep_del tinyint(4),
+KEY id (id),
+KEY pid (pid)
+);
+INSERT INTO t1 VALUES (1,NULL,NULL);
+INSERT INTO t1 VALUES (2,1,NULL);
+select * from t1 LEFT JOIN t1 t2 ON (t1.id=t2.pid) AND t2.rep_del IS NULL;
+id	pid	rep_del	id	pid	rep_del
+1	NULL	NULL	2	1	NULL
+2	1	NULL	NULL	NULL	NULL
+create index rep_del ON t1(rep_del);
+select * from t1 LEFT JOIN t1 t2 ON (t1.id=t2.pid) AND t2.rep_del IS NULL;
+id	pid	rep_del	id	pid	rep_del
+1	NULL	NULL	2	1	NULL
+2	1	NULL	NULL	NULL	NULL
+drop table t1;
+CREATE TABLE t1 (
+id int(11) DEFAULT '0' NOT NULL,
+name tinytext DEFAULT '' NOT NULL,
+UNIQUE id (id)
+);
+Warnings:
+Warning	1101	BLOB/TEXT column 'name' can't have a default value
+INSERT INTO t1 VALUES (1,'yes'),(2,'no');
+CREATE TABLE t2 (
+id int(11) DEFAULT '0' NOT NULL,
+idx int(11) DEFAULT '0' NOT NULL,
+UNIQUE id (id,idx)
+);
+INSERT INTO t2 VALUES (1,1);
+explain SELECT * from t1 left join t2 on t1.id=t2.id where t2.id IS NULL;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	2	
+1	SIMPLE	t2	ref	id	id	4	test.t1.id	1	Using where; Using index; Not exists
+SELECT * from t1 left join t2 on t1.id=t2.id where t2.id IS NULL;
+id	name	id	idx
+2	no	NULL	NULL
+drop table t1,t2;
+create table t1 (bug_id mediumint, reporter mediumint);
+create table t2 (bug_id mediumint, who mediumint, index(who));
+insert into t2 values (1,1),(1,2);
+insert into t1 values (1,1),(2,1);
+SELECT * FROM t1 LEFT JOIN t2 ON (t1.bug_id =  t2.bug_id AND  t2.who = 2) WHERE  (t1.reporter = 2 OR t2.who = 2);
+bug_id	reporter	bug_id	who
+1	1	1	2
+drop table t1,t2;
+create table t1 (fooID smallint unsigned auto_increment, primary key (fooID));
+create table t2 (fooID smallint unsigned not null, barID smallint unsigned not null, primary key (fooID,barID));
+insert into t1 (fooID) values (10),(20),(30);
+insert into t2 values (10,1),(20,2),(30,3);
+explain select * from t2 left join t1 on t1.fooID = t2.fooID and t1.fooID = 30;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t2	index	NULL	PRIMARY	4	NULL	3	Using index
+1	SIMPLE	t1	const	PRIMARY	PRIMARY	2	const	1	Using where; Using index
+select * from t2 left join t1 on t1.fooID = t2.fooID and t1.fooID = 30;
+fooID	barID	fooID
+10	1	NULL
+20	2	NULL
+30	3	30
+select * from t2 left join t1 ignore index(primary) on t1.fooID = t2.fooID and t1.fooID = 30;
+fooID	barID	fooID
+30	3	30
+10	1	NULL
+20	2	NULL
+drop table t1,t2;
+create table t1 (i int);
+create table t2 (i int);
+create table t3 (i int);
+insert into t1 values(1),(2);
+insert into t2 values(2),(3);
+insert into t3 values(2),(4);
+select * from t1 natural left join t2 natural left join t3;
+i
+2
+1
+select * from t1 natural left join t2 where (t2.i is not null)=0;
+i
+1
+select * from t1 natural left join t2 where (t2.i is not null) is not null;
+i
+2
+1
+select * from t1 natural left join t2 where (i is not null)=0;
+i
+select * from t1 natural left join t2 where (i is not null) is not null;
+i
+2
+1
+drop table t1,t2,t3;
+create table t1 (f1 integer,f2 integer,f3 integer);
+create table t2 (f2 integer,f4 integer);
+create table t3 (f3 integer,f5 integer);
+select * from t1
+left outer join t2 using (f2)
+left outer join t3 using (f3);
+f3	f2	f1	f4	f5
+drop table t1,t2,t3;
+create table t1 (a1 int, a2 int);
+create table t2 (b1 int not null, b2 int);
+create table t3 (c1 int, c2 int);
+insert into t1 values (1,2), (2,2), (3,2);
+insert into t2 values (1,3), (2,3);
+insert into t3 values (2,4),        (3,4);
+select * from t1 left join t2  on  b1 = a1 left join t3  on  c1 = a1  and  b1 is null;
+a1	a2	b1	b2	c1	c2
+1	2	1	3	NULL	NULL
+2	2	2	3	NULL	NULL
+3	2	NULL	NULL	3	4
+explain select * from t1 left join t2  on  b1 = a1 left join t3  on  c1 = a1  and  b1 is null;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	2	Using where; Using join buffer
+1	SIMPLE	t3	ALL	NULL	NULL	NULL	NULL	2	Using where; Using join buffer
+drop table t1, t2, t3;
+create table t1 (
+a int(11),
+b char(10),
+key (a)
+);
+insert into t1 (a) values (1),(2),(3),(4);
+create table t2 (a int);
+select * from t1 left join t2 on t1.a=t2.a where not (t2.a <=> t1.a);
+a	b	a
+1	NULL	NULL
+2	NULL	NULL
+3	NULL	NULL
+4	NULL	NULL
+select * from t1 left join t2 on t1.a=t2.a having not (t2.a <=> t1.a);
+a	b	a
+1	NULL	NULL
+2	NULL	NULL
+3	NULL	NULL
+4	NULL	NULL
+drop table t1,t2;
+create table t1 (
+match_id tinyint(3) unsigned not null auto_increment,
+home tinyint(3) unsigned default '0',
+unique key match_id (match_id),
+key match_id_2 (match_id)
+);
+insert into t1 values("1", "2");
+create table t2 (
+player_id tinyint(3) unsigned default '0',
+match_1_h tinyint(3) unsigned default '0',
+key player_id (player_id)
+);
+insert into t2 values("1", "5");
+insert into t2 values("2", "9");
+insert into t2 values("3", "3");
+insert into t2 values("4", "7");
+insert into t2 values("5", "6");
+insert into t2 values("6", "8");
+insert into t2 values("7", "4");
+insert into t2 values("8", "12");
+insert into t2 values("9", "11");
+insert into t2 values("10", "10");
+explain select s.*, '*', m.*, (s.match_1_h - m.home) UUX from 
+(t2 s left join t1 m on m.match_id = 1) 
+order by m.match_id desc;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	s	ALL	NULL	NULL	NULL	NULL	10	Using temporary; Using filesort
+1	SIMPLE	m	const	match_id,match_id_2	match_id	1	const	1	Using join buffer
+explain select s.*, '*', m.*, (s.match_1_h - m.home) UUX from 
+(t2 s left join t1 m on m.match_id = 1) 
+order by UUX desc;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	s	ALL	NULL	NULL	NULL	NULL	10	Using temporary; Using filesort
+1	SIMPLE	m	const	match_id,match_id_2	match_id	1	const	1	Using join buffer
+select s.*, '*', m.*, (s.match_1_h - m.home) UUX from 
+(t2 s left join t1 m on m.match_id = 1) 
+order by UUX desc;
+player_id	match_1_h	*	match_id	home	UUX
+8	12	*	1	2	10
+9	11	*	1	2	9
+10	10	*	1	2	8
+2	9	*	1	2	7
+6	8	*	1	2	6
+4	7	*	1	2	5
+5	6	*	1	2	4
+1	5	*	1	2	3
+7	4	*	1	2	2
+3	3	*	1	2	1
+explain select s.*, '*', m.*, (s.match_1_h - m.home) UUX from 
+t2 s straight_join t1 m where m.match_id = 1 
+order by UUX desc;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	s	ALL	NULL	NULL	NULL	NULL	10	Using temporary; Using filesort
+1	SIMPLE	m	const	match_id,match_id_2	match_id	1	const	1	Using join buffer
+select s.*, '*', m.*, (s.match_1_h - m.home) UUX from 
+t2 s straight_join t1 m where m.match_id = 1 
+order by UUX desc;
+player_id	match_1_h	*	match_id	home	UUX
+8	12	*	1	2	10
+9	11	*	1	2	9
+10	10	*	1	2	8
+2	9	*	1	2	7
+6	8	*	1	2	6
+4	7	*	1	2	5
+5	6	*	1	2	4
+1	5	*	1	2	3
+7	4	*	1	2	2
+3	3	*	1	2	1
+drop table t1, t2;
+create table t1 (a int, b int, unique index idx (a, b));
+create table t2 (a int, b int, c int, unique index idx (a, b));
+insert into t1 values (1, 10), (1,11), (2,10), (2,11);
+insert into t2 values (1,10,3);
+select t1.a, t1.b, t2.c from t1 left join t2
+on t1.a=t2.a and t1.b=t2.b and t2.c=3
+where t1.a=1 and t2.c is null;
+a	b	c
+1	11	NULL
+drop table t1, t2;
+CREATE TABLE t1 (
+ts_id bigint(20) default NULL,
+inst_id tinyint(4) default NULL,
+flag_name varchar(64) default NULL,
+flag_value text,
+UNIQUE KEY ts_id (ts_id,inst_id,flag_name)
+) ENGINE=MyISAM DEFAULT CHARSET=utf8;
+CREATE TABLE t2 (
+ts_id bigint(20) default NULL,
+inst_id tinyint(4) default NULL,
+flag_name varchar(64) default NULL,
+flag_value text,
+UNIQUE KEY ts_id (ts_id,inst_id,flag_name)
+) ENGINE=MyISAM DEFAULT CHARSET=utf8;
+INSERT INTO t1 VALUES
+(111056548820001, 0, 'flag1', NULL),
+(111056548820001, 0, 'flag2', NULL),
+(2, 0, 'other_flag', NULL);
+INSERT INTO t2 VALUES
+(111056548820001, 3, 'flag1', 'sss');
+SELECT t1.flag_name,t2.flag_value 
+FROM t1 LEFT JOIN t2 
+ON (t1.ts_id = t2.ts_id AND t1.flag_name = t2.flag_name AND
+t2.inst_id = 3) 
+WHERE t1.inst_id = 0 AND t1.ts_id=111056548820001 AND
+t2.flag_value IS  NULL;
+flag_name	flag_value
+flag2	NULL
+DROP TABLE t1,t2;
+CREATE TABLE t1 (
+id int(11) unsigned NOT NULL auto_increment,
+text_id int(10) unsigned default NULL,
+PRIMARY KEY  (id)
+);
+INSERT INTO t1 VALUES("1", "0");
+INSERT INTO t1 VALUES("2", "10");
+CREATE TABLE t2 (
+text_id char(3) NOT NULL default '',
+language_id char(3) NOT NULL default '',
+text_data text,
+PRIMARY KEY  (text_id,language_id)
+);
+INSERT INTO t2 VALUES("0", "EN", "0-EN");
+INSERT INTO t2 VALUES("0", "SV", "0-SV");
+INSERT INTO t2 VALUES("10", "EN", "10-EN");
+INSERT INTO t2 VALUES("10", "SV", "10-SV");
+SELECT t1.id, t1.text_id, t2.text_data
+FROM t1 LEFT JOIN t2
+ON t1.text_id = t2.text_id
+AND t2.language_id = 'SV'
+  WHERE (t1.id LIKE '%' OR t2.text_data LIKE '%');
+id	text_id	text_data
+1	0	0-SV
+2	10	10-SV
+DROP TABLE t1, t2;
+CREATE TABLE t0 (a0 int PRIMARY KEY);
+CREATE TABLE t1 (a1 int PRIMARY KEY);
+CREATE TABLE t2 (a2 int);
+CREATE TABLE t3 (a3 int);
+INSERT INTO t0 VALUES (1);
+INSERT INTO t1 VALUES (1);
+INSERT INTO t2 VALUES (1), (2);
+INSERT INTO t3 VALUES (1), (2);
+SELECT * FROM t1 LEFT JOIN t2 ON a1=0;
+a1	a2
+1	NULL
+EXPLAIN SELECT * FROM t1 LEFT JOIN t2 ON a1=0;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	system	NULL	NULL	NULL	NULL	1	
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	2	Using where
+SELECT * FROM t1 LEFT JOIN (t2,t3) ON a1=0;
+a1	a2	a3
+1	NULL	NULL
+EXPLAIN SELECT * FROM t1 LEFT JOIN (t2,t3) ON a1=0;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	system	NULL	NULL	NULL	NULL	1	
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	2	Using where
+1	SIMPLE	t3	ALL	NULL	NULL	NULL	NULL	2	
+SELECT * FROM t0, t1 LEFT JOIN (t2,t3) ON a1=0 WHERE a0=a1;
+a0	a1	a2	a3
+1	1	NULL	NULL
+EXPLAIN SELECT * FROM t0, t1 LEFT JOIN (t2,t3) ON a1=0 WHERE a0=a1;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t0	system	PRIMARY	NULL	NULL	NULL	1	
+1	SIMPLE	t1	system	PRIMARY	NULL	NULL	NULL	1	
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	2	Using where
+1	SIMPLE	t3	ALL	NULL	NULL	NULL	NULL	2	
+INSERT INTO t0 VALUES (0);
+INSERT INTO t1 VALUES (0);
+SELECT * FROM t0, t1 LEFT JOIN (t2,t3) ON a1=5 WHERE a0=a1 AND a0=1;
+a0	a1	a2	a3
+1	1	NULL	NULL
+EXPLAIN SELECT * FROM t0, t1 LEFT JOIN (t2,t3) ON a1=5 WHERE a0=a1 AND a0=1;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t0	const	PRIMARY	PRIMARY	4	const	1	Using index
+1	SIMPLE	t1	const	PRIMARY	PRIMARY	4	const	1	Using index
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	2	Using where
+1	SIMPLE	t3	ALL	NULL	NULL	NULL	NULL	2	
+drop table t1,t2;
+create table t1 (a int, b int);
+insert into t1 values (1,1),(2,2),(3,3);
+create table t2 (a int, b int);
+insert into t2 values (1,1), (2,2);
+select * from t2 right join t1 on t2.a=t1.a;
+a	b	a	b
+1	1	1	1
+2	2	2	2
+NULL	NULL	3	3
+select straight_join * from t2 right join t1 on t2.a=t1.a;
+a	b	a	b
+1	1	1	1
+2	2	2	2
+NULL	NULL	3	3
+DROP TABLE t0,t1,t2,t3;
+CREATE TABLE t1 (a int PRIMARY KEY, b int);
+CREATE TABLE t2 (a int PRIMARY KEY, b int);
+INSERT INTO t1 VALUES (1,1), (2,1), (3,1), (4,2);
+INSERT INTO t2 VALUES (1,2), (2,2);
+SELECT * FROM t1 LEFT JOIN t2 ON t1.a=t2.a;
+a	b	a	b
+1	1	1	2
+2	1	2	2
+3	1	NULL	NULL
+4	2	NULL	NULL
+SELECT * FROM t1 LEFT JOIN t2 ON t1.a=t2.a WHERE t1.b=1;
+a	b	a	b
+1	1	1	2
+2	1	2	2
+3	1	NULL	NULL
+SELECT * FROM t1 LEFT JOIN t2 ON t1.a=t2.a
+WHERE t1.b=1 XOR (NOT ISNULL(t2.a) AND t2.b=1);
+a	b	a	b
+1	1	1	2
+2	1	2	2
+3	1	NULL	NULL
+SELECT * FROM t1 LEFT JOIN t2 ON t1.a=t2.a WHERE not(0+(t1.a=30 and t2.b=1));
+a	b	a	b
+1	1	1	2
+2	1	2	2
+3	1	NULL	NULL
+4	2	NULL	NULL
+DROP TABLE t1,t2;
+set group_concat_max_len=5;
+create table t1 (a int, b varchar(20));
+create table t2 (a int, c varchar(20));
+insert into t1 values (1,"aaaaaaaaaa"),(2,"bbbbbbbbbb");
+insert into t2 values (1,"cccccccccc"),(2,"dddddddddd");
+select group_concat(t1.b,t2.c) from t1 left join t2 using(a) group by t1.a;
+group_concat(t1.b,t2.c)
+aaaaa
+bbbbb
+Warnings:
+Warning	1260	2 line(s) were cut by GROUP_CONCAT()
+select group_concat(t1.b,t2.c) from t1 inner join t2 using(a) group by t1.a;
+group_concat(t1.b,t2.c)
+aaaaa
+bbbbb
+Warnings:
+Warning	1260	2 line(s) were cut by GROUP_CONCAT()
+select group_concat(t1.b,t2.c) from t1 left join t2 using(a) group by a;
+group_concat(t1.b,t2.c)
+aaaaa
+bbbbb
+Warnings:
+Warning	1260	2 line(s) were cut by GROUP_CONCAT()
+select group_concat(t1.b,t2.c) from t1 inner join t2 using(a) group by a;
+group_concat(t1.b,t2.c)
+aaaaa
+bbbbb
+Warnings:
+Warning	1260	2 line(s) were cut by GROUP_CONCAT()
+drop table t1, t2;
+set group_concat_max_len=default;
+create table t1 (gid smallint(5) unsigned not null, x int(11) not null, y int(11) not null, art int(11) not null, primary key  (gid,x,y));
+insert t1 values (1, -5, -8, 2), (1, 2, 2, 1), (1, 1, 1, 1);
+create table t2 (gid smallint(5) unsigned not null, x int(11) not null, y int(11) not null, id int(11) not null, primary key  (gid,id,x,y), key id (id));
+insert t2 values (1, -5, -8, 1), (1, 1, 1, 1), (1, 2, 2, 1);
+create table t3 ( set_id smallint(5) unsigned not null, id tinyint(4) unsigned not null, name char(12) not null, primary key  (id,set_id));
+insert t3 values (0, 1, 'a'), (1, 1, 'b'), (0, 2, 'c'), (1, 2, 'd'), (1, 3, 'e'), (1, 4, 'f'), (1, 5, 'g'), (1, 6, 'h');
+explain select name from t1 left join t2 on t1.x = t2.x and t1.y = t2.y
+left join t3 on t1.art = t3.id where t2.id =1 and t2.x = -5 and t2.y =-8
+and t1.gid =1 and t2.gid =1 and t3.set_id =1;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	const	PRIMARY	PRIMARY	10	const,const,const	1	
+1	SIMPLE	t2	const	PRIMARY,id	PRIMARY	14	const,const,const,const	1	Using index
+1	SIMPLE	t3	const	PRIMARY	PRIMARY	3	const,const	1	
+drop tables t1,t2,t3;
+CREATE TABLE t1 (EMPNUM INT, GRP INT);
+INSERT INTO t1 VALUES (0, 10);
+INSERT INTO t1 VALUES (2, 30);
+CREATE TABLE t2 (EMPNUM INT, NAME CHAR(5));
+INSERT INTO t2 VALUES (0, 'KERI');
+INSERT INTO t2 VALUES (9, 'BARRY');
+CREATE VIEW v1 AS
+SELECT COALESCE(t2.EMPNUM,t1.EMPNUM) AS EMPNUM, NAME, GRP
+FROM t2 LEFT OUTER JOIN t1 ON t2.EMPNUM=t1.EMPNUM;
+SELECT * FROM v1;
+EMPNUM	NAME	GRP
+0	KERI	10
+9	BARRY	NULL
+SELECT * FROM v1 WHERE EMPNUM < 10;
+EMPNUM	NAME	GRP
+0	KERI	10
+9	BARRY	NULL
+DROP VIEW v1;
+DROP TABLE t1,t2;
+CREATE TABLE t1 (c11 int);
+CREATE TABLE t2 (c21 int);
+INSERT INTO t1 VALUES (30), (40), (50);
+INSERT INTO t2 VALUES (300), (400), (500);
+SELECT * FROM t1 LEFT JOIN t2 ON (c11=c21 AND c21=30) WHERE c11=40;
+c11	c21
+40	NULL
+DROP TABLE t1, t2;
+CREATE TABLE t1 (a int PRIMARY KEY, b int);
+CREATE TABLE t2 (a int PRIMARY KEY, b int);
+INSERT INTO t1 VALUES (1,2), (2,1), (3,2), (4,3), (5,6), (6,5), (7,8), (8,7), (9,10);
+INSERT INTO t2 VALUES (3,0), (4,1), (6,4), (7,5);
+SELECT * FROM t1 LEFT JOIN t2 ON t1.a = t2.a WHERE t2.b <= t1.a AND t1.a <= t1.b;
+a	b	a	b
+7	8	7	5
+SELECT * FROM t1 LEFT JOIN t2 ON t1.a = t2.a WHERE t1.a BETWEEN t2.b AND t1.b;
+a	b	a	b
+7	8	7	5
+SELECT * FROM t1 LEFT JOIN t2 ON t1.a = t2.a WHERE NOT(t1.a NOT BETWEEN t2.b AND t1.b);
+a	b	a	b
+7	8	7	5
+SELECT * FROM t1 LEFT JOIN t2 ON t1.a = t2.a WHERE t2.b > t1.a OR t1.a > t1.b;
+a	b	a	b
+3	2	3	0
+4	3	4	1
+6	5	6	4
+2	1	NULL	NULL
+8	7	NULL	NULL
+SELECT * FROM t1 LEFT JOIN t2 ON t1.a = t2.a WHERE t1.a NOT BETWEEN t2.b AND t1.b;
+a	b	a	b
+3	2	3	0
+4	3	4	1
+6	5	6	4
+2	1	NULL	NULL
+8	7	NULL	NULL
+SELECT * FROM t1 LEFT JOIN t2 ON t1.a = t2.a WHERE NOT(t1.a BETWEEN t2.b AND t1.b);
+a	b	a	b
+3	2	3	0
+4	3	4	1
+6	5	6	4
+2	1	NULL	NULL
+8	7	NULL	NULL
+SELECT * FROM t1 LEFT JOIN t2 ON t1.a = t2.a WHERE t1.a = t2.a OR t2.b > t1.a OR t1.a > t1.b;
+a	b	a	b
+3	2	3	0
+4	3	4	1
+6	5	6	4
+7	8	7	5
+2	1	NULL	NULL
+8	7	NULL	NULL
+SELECT * FROM t1 LEFT JOIN t2 ON t1.a = t2.a WHERE NOT(t1.a != t2.a AND t1.a BETWEEN t2.b AND t1.b);
+a	b	a	b
+3	2	3	0
+4	3	4	1
+6	5	6	4
+7	8	7	5
+2	1	NULL	NULL
+8	7	NULL	NULL
+SELECT * FROM t1 LEFT JOIN t2 ON t1.a = t2.a WHERE t1.a = t2.a AND (t2.b > t1.a OR t1.a > t1.b);
+a	b	a	b
+3	2	3	0
+4	3	4	1
+6	5	6	4
+SELECT * FROM t1 LEFT JOIN t2 ON t1.a = t2.a WHERE NOT(t1.a != t2.a OR t1.a BETWEEN t2.b AND t1.b);
+a	b	a	b
+3	2	3	0
+4	3	4	1
+6	5	6	4
+SELECT * FROM t1 LEFT JOIN t2 ON t1.a = t2.a WHERE t1.a = t2.a OR t1.a = t2.b;
+a	b	a	b
+3	2	3	0
+4	3	4	1
+6	5	6	4
+7	8	7	5
+SELECT * FROM t1 LEFT JOIN t2 ON t1.a = t2.a WHERE t1.a IN(t2.a, t2.b);
+a	b	a	b
+3	2	3	0
+4	3	4	1
+6	5	6	4
+7	8	7	5
+SELECT * FROM t1 LEFT JOIN t2 ON t1.a = t2.a WHERE NOT(t1.a NOT IN(t2.a, t2.b));
+a	b	a	b
+3	2	3	0
+4	3	4	1
+6	5	6	4
+7	8	7	5
+SELECT * FROM t1 LEFT JOIN t2 ON t1.a = t2.a WHERE t1.a != t1.b AND t1.a != t2.b;
+a	b	a	b
+3	2	3	0
+4	3	4	1
+6	5	6	4
+7	8	7	5
+SELECT * FROM t1 LEFT JOIN t2 ON t1.a = t2.a WHERE t1.a NOT IN(t1.b, t2.b);
+a	b	a	b
+3	2	3	0
+4	3	4	1
+6	5	6	4
+7	8	7	5
+SELECT * FROM t1 LEFT JOIN t2 ON t1.a = t2.a WHERE NOT(t1.a IN(t1.b, t2.b));
+a	b	a	b
+3	2	3	0
+4	3	4	1
+6	5	6	4
+7	8	7	5
+SELECT * FROM t1 LEFT JOIN t2 ON t1.a = t2.a WHERE t2.a != t2.b OR (t1.a != t2.a AND t1.a != t2.b);
+a	b	a	b
+3	2	3	0
+4	3	4	1
+6	5	6	4
+7	8	7	5
+SELECT * FROM t1 LEFT JOIN t2 ON t1.a = t2.a WHERE NOT(t2.a = t2.b AND t1.a IN(t2.a, t2.b));
+a	b	a	b
+3	2	3	0
+4	3	4	1
+6	5	6	4
+7	8	7	5
+SELECT * FROM t1 LEFT JOIN t2 ON t1.a = t2.a WHERE t2.a != t2.b AND t1.a != t1.b AND t1.a != t2.b;
+a	b	a	b
+3	2	3	0
+4	3	4	1
+6	5	6	4
+7	8	7	5
+SELECT * FROM t1 LEFT JOIN t2 ON t1.a = t2.a WHERE NOT(t2.a = t2.b OR t1.a IN(t1.b, t2.b));
+a	b	a	b
+3	2	3	0
+4	3	4	1
+6	5	6	4
+7	8	7	5
+EXPLAIN SELECT * FROM t1 LEFT JOIN t2 ON t1.a = t2.a WHERE t1.a = t2.a OR t1.a = t2.b;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t2	ALL	PRIMARY	NULL	NULL	NULL	4	
+1	SIMPLE	t1	eq_ref	PRIMARY	PRIMARY	4	test.t2.a	1	Using join buffer
+EXPLAIN SELECT * FROM t1 LEFT JOIN t2 ON t1.a = t2.a WHERE t1.a IN(t2.a, t2.b);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t2	ALL	PRIMARY	NULL	NULL	NULL	4	Using where
+1	SIMPLE	t1	eq_ref	PRIMARY	PRIMARY	4	test.t2.a	1	Using join buffer
+EXPLAIN SELECT * FROM t1 LEFT JOIN t2 ON t1.a = t2.a WHERE t1.a > IF(t1.a = t2.b-2, t2.b, t2.b-1);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t2	ALL	PRIMARY	NULL	NULL	NULL	4	Using where
+1	SIMPLE	t1	eq_ref	PRIMARY	PRIMARY	4	test.t2.a	1	Using join buffer
+DROP TABLE t1,t2;
+DROP VIEW IF EXISTS v1,v2;
+DROP TABLE IF EXISTS t1,t2;
+CREATE TABLE t1 (a int);
+CREATE table t2 (b int);
+INSERT INTO t1 VALUES (1), (2), (3), (4), (1), (1), (3);
+INSERT INTO t2 VALUES (2), (3);
+CREATE VIEW v1 AS SELECT a FROM t1 JOIN t2 ON t1.a=t2.b;
+CREATE VIEW v2 AS SELECT b FROM t2 JOIN t1 ON t2.b=t1.a;
+SELECT v1.a, v2. b 
+FROM v1 LEFT OUTER JOIN v2 ON (v1.a=v2.b) AND (v1.a >= 3)
+GROUP BY v1.a;
+a	b
+2	NULL
+3	3
+SELECT v1.a, v2. b 
+FROM { OJ v1 LEFT OUTER JOIN v2 ON (v1.a=v2.b) AND (v1.a >= 3) }
+GROUP BY v1.a;
+a	b
+2	NULL
+3	3
+DROP VIEW v1,v2;
+DROP TABLE t1,t2;
+CREATE TABLE t1 (a int);
+CREATE TABLE t2 (b int);
+INSERT INTO t1 VALUES (1), (2), (3), (4);
+INSERT INTO t2 VALUES (2), (3);
+SELECT * FROM t1 LEFT JOIN t2 ON t1.a = t2.b WHERE (1=1);
+a	b
+2	2
+3	3
+1	NULL
+4	NULL
+SELECT * FROM t1 LEFT JOIN t2 ON t1.a = t2.b WHERE (1 OR 1);
+a	b
+2	2
+3	3
+1	NULL
+4	NULL
+SELECT * FROM t1 LEFT JOIN t2 ON t1.a = t2.b WHERE (0 OR 1);
+a	b
+2	2
+3	3
+1	NULL
+4	NULL
+SELECT * FROM t1 LEFT JOIN t2 ON t1.a = t2.b WHERE (1=1 OR 2=2);
+a	b
+2	2
+3	3
+1	NULL
+4	NULL
+SELECT * FROM t1 LEFT JOIN t2 ON t1.a = t2.b WHERE (1=1 OR 1=0);
+a	b
+2	2
+3	3
+1	NULL
+4	NULL
+DROP TABLE t1,t2;
+CREATE TABLE t1 (
+f1 varchar(16) collate latin1_swedish_ci PRIMARY KEY,
+f2 varchar(16) collate latin1_swedish_ci
+);
+CREATE TABLE t2 (
+f1 varchar(16) collate latin1_swedish_ci PRIMARY KEY,
+f3 varchar(16) collate latin1_swedish_ci
+);
+INSERT INTO t1 VALUES ('bla','blah');
+INSERT INTO t2 VALUES ('bla','sheep');
+SELECT * FROM t1 JOIN t2 USING(f1) WHERE f1='Bla';
+f1	f2	f3
+bla	blah	sheep
+SELECT * FROM t1 LEFT JOIN t2 USING(f1) WHERE f1='bla';
+f1	f2	f3
+bla	blah	sheep
+SELECT * FROM t1 LEFT JOIN t2 USING(f1) WHERE f1='Bla';
+f1	f2	f3
+bla	blah	sheep
+DROP TABLE t1,t2;
+CREATE TABLE t1 (id int PRIMARY KEY, a varchar(8));
+CREATE TABLE t2 (id int NOT NULL, b int NOT NULL, INDEX idx(id));
+INSERT INTO t1 VALUES
+(1,'aaaaaaa'), (5,'eeeeeee'), (4,'ddddddd'), (2,'bbbbbbb'), (3,'ccccccc');
+INSERT INTO t2 VALUES
+(3,10), (2,20), (5,30), (3,20), (5,10), (3,40), (3,30), (2,10), (2,40);
+EXPLAIN
+SELECT t1.id, a FROM t1 LEFT JOIN t2 ON t1.id=t2.id WHERE t2.b IS NULL;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	5	
+1	SIMPLE	t2	ref	idx	idx	4	test.t1.id	2	Using where; Not exists; Using join buffer
+flush status;
+SELECT t1.id, a FROM t1 LEFT JOIN t2 ON t1.id=t2.id WHERE t2.b IS NULL;
+id	a
+1	aaaaaaa
+4	ddddddd
+show status like 'Handler_read%';
+Variable_name	Value
+Handler_read_first	0
+Handler_read_key	5
+Handler_read_next	9
+Handler_read_prev	0
+Handler_read_rnd	3
+Handler_read_rnd_next	6
+DROP TABLE t1,t2;
+CREATE TABLE t1 (c int  PRIMARY KEY, e int NOT NULL);
+INSERT INTO t1 VALUES (1,0), (2,1);
+CREATE TABLE t2 (d int PRIMARY KEY);
+INSERT INTO t2 VALUES (1), (2), (3);
+EXPLAIN SELECT * FROM t1 LEFT JOIN t2 ON e<>0 WHERE c=1 AND d IS NULL;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	const	PRIMARY	PRIMARY	4	const	1	
+1	SIMPLE	t2	index	NULL	PRIMARY	4	NULL	3	Using where; Using index; Not exists
+SELECT * FROM t1 LEFT JOIN t2 ON e<>0 WHERE c=1 AND d IS NULL;
+c	e	d
+1	0	NULL
+SELECT * FROM t1 LEFT JOIN t2 ON e<>0 WHERE c=1 AND d<=>NULL;
+c	e	d
+1	0	NULL
+DROP TABLE t1,t2;
+set join_cache_level=default;
+show variables like 'join_cache_level';
+Variable_name	Value
+join_cache_level	1

=== added file 'mysql-test/r/select_jcl6.result'
--- a/mysql-test/r/select_jcl6.result	1970-01-01 00:00:00 +0000
+++ b/mysql-test/r/select_jcl6.result	2009-12-21 02:26:15 +0000
@@ -0,0 +1,4546 @@
+set join_cache_level=6;
+show variables like 'join_cache_level';
+Variable_name	Value
+join_cache_level	6
+drop table if exists t1,t2,t3,t4,t11;
+drop table if exists t1_1,t1_2,t9_1,t9_2,t1aa,t2aa;
+drop view if exists v1;
+CREATE TABLE t1 (
+Period smallint(4) unsigned zerofill DEFAULT '0000' NOT NULL,
+Varor_period smallint(4) unsigned DEFAULT '0' NOT NULL
+);
+INSERT INTO t1 VALUES (9410,9412);
+select period from t1;
+period
+9410
+select * from t1;
+Period	Varor_period
+9410	9412
+select t1.* from t1;
+Period	Varor_period
+9410	9412
+CREATE TABLE t2 (
+auto int not null auto_increment,
+fld1 int(6) unsigned zerofill DEFAULT '000000' NOT NULL,
+companynr tinyint(2) unsigned zerofill DEFAULT '00' NOT NULL,
+fld3 char(30) DEFAULT '' NOT NULL,
+fld4 char(35) DEFAULT '' NOT NULL,
+fld5 char(35) DEFAULT '' NOT NULL,
+fld6 char(4) DEFAULT '' NOT NULL,
+UNIQUE fld1 (fld1),
+KEY fld3 (fld3),
+PRIMARY KEY (auto)
+);
+select t2.fld3 from t2 where companynr = 58 and fld3 like "%imaginable%";
+fld3
+imaginable
+select fld3 from t2 where fld3 like "%cultivation" ;
+fld3
+cultivation
+select t2.fld3,companynr from t2 where companynr = 57+1 order by fld3;
+fld3	companynr
+concoct	58
+druggists	58
+engrossing	58
+Eurydice	58
+exclaimers	58
+ferociousness	58
+hopelessness	58
+Huey	58
+imaginable	58
+judges	58
+merging	58
+ostrich	58
+peering	58
+Phelps	58
+presumes	58
+Ruth	58
+sentences	58
+Shylock	58
+straggled	58
+synergy	58
+thanking	58
+tying	58
+unlocks	58
+select fld3,companynr from t2 where companynr = 58 order by fld3;
+fld3	companynr
+concoct	58
+druggists	58
+engrossing	58
+Eurydice	58
+exclaimers	58
+ferociousness	58
+hopelessness	58
+Huey	58
+imaginable	58
+judges	58
+merging	58
+ostrich	58
+peering	58
+Phelps	58
+presumes	58
+Ruth	58
+sentences	58
+Shylock	58
+straggled	58
+synergy	58
+thanking	58
+tying	58
+unlocks	58
+select fld3 from t2 order by fld3 desc limit 10;
+fld3
+youthfulness
+yelped
+Wotan
+workers
+Witt
+witchcraft
+Winsett
+Willy
+willed
+wildcats
+select fld3 from t2 order by fld3 desc limit 5;
+fld3
+youthfulness
+yelped
+Wotan
+workers
+Witt
+select fld3 from t2 order by fld3 desc limit 5,5;
+fld3
+witchcraft
+Winsett
+Willy
+willed
+wildcats
+select t2.fld3 from t2 where fld3 = 'honeysuckle';
+fld3
+honeysuckle
+select t2.fld3 from t2 where fld3 LIKE 'honeysuckl_';
+fld3
+honeysuckle
+select t2.fld3 from t2 where fld3 LIKE 'hon_ysuckl_';
+fld3
+honeysuckle
+select t2.fld3 from t2 where fld3 LIKE 'honeysuckle%';
+fld3
+honeysuckle
+select t2.fld3 from t2 where fld3 LIKE 'h%le';
+fld3
+honeysuckle
+select t2.fld3 from t2 where fld3 LIKE 'honeysuckle_';
+fld3
+select t2.fld3 from t2 where fld3 LIKE 'don_t_find_me_please%';
+fld3
+explain select t2.fld3 from t2 where fld3 = 'honeysuckle';
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t2	ref	fld3	fld3	30	const	1	Using where; Using index
+explain select fld3 from t2 ignore index (fld3) where fld3 = 'honeysuckle';
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	1199	Using where
+explain select fld3 from t2 use index (fld1) where fld3 = 'honeysuckle';
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	1199	Using where
+explain select fld3 from t2 use index (fld3) where fld3 = 'honeysuckle';
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t2	ref	fld3	fld3	30	const	1	Using where; Using index
+explain select fld3 from t2 use index (fld1,fld3) where fld3 = 'honeysuckle';
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t2	ref	fld3	fld3	30	const	1	Using where; Using index
+explain select fld3 from t2 ignore index (fld3,not_used);
+ERROR 42000: Key 'not_used' doesn't exist in table 't2'
+explain select fld3 from t2 use index (not_used);
+ERROR 42000: Key 'not_used' doesn't exist in table 't2'
+select t2.fld3 from t2 where fld3 >= 'honeysuckle' and fld3 <= 'honoring' order by fld3;
+fld3
+honeysuckle
+honoring
+explain select t2.fld3 from t2 where fld3 >= 'honeysuckle' and fld3 <= 'honoring' order by fld3;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t2	range	fld3	fld3	30	NULL	2	Using where; Using index
+select fld1,fld3 from t2 where fld3="Colombo" or fld3 = "nondecreasing" order by fld3;
+fld1	fld3
+148504	Colombo
+068305	Colombo
+000000	nondecreasing
+select fld1,fld3 from t2 where companynr = 37 and fld3 = 'appendixes';
+fld1	fld3
+232605	appendixes
+1232605	appendixes
+1232606	appendixes
+1232607	appendixes
+1232608	appendixes
+1232609	appendixes
+select fld1 from t2 where fld1=250501 or fld1="250502";
+fld1
+250501
+250502
+explain select fld1 from t2 where fld1=250501 or fld1="250502";
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t2	range	fld1	fld1	4	NULL	2	Using where; Using index
+select fld1 from t2 where fld1=250501 or fld1=250502 or fld1 >= 250505 and fld1 <= 250601 or fld1 between 250501 and 250502;
+fld1
+250501
+250502
+250505
+250601
+explain select fld1 from t2 where fld1=250501 or fld1=250502 or fld1 >= 250505 and fld1 <= 250601 or fld1 between 250501 and 250502;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t2	range	fld1	fld1	4	NULL	4	Using where; Using index
+select fld1,fld3 from t2 where companynr = 37 and fld3 like 'f%';
+fld1	fld3
+012001	flanking
+013602	foldout
+013606	fingerings
+018007	fanatic
+018017	featherweight
+018054	fetters
+018103	flint
+018104	flopping
+036002	funereal
+038017	fetched
+038205	firearm
+058004	Fenton
+088303	feminine
+186002	freakish
+188007	flurried
+188505	fitting
+198006	furthermore
+202301	Fitzpatrick
+208101	fiftieth
+208113	freest
+218008	finishers
+218022	feed
+218401	faithful
+226205	foothill
+226209	furnishings
+228306	forthcoming
+228311	fated
+231315	freezes
+232102	forgivably
+238007	filial
+238008	fixedly
+select fld3 from t2 where fld3 like "L%" and fld3 = "ok";
+fld3
+select fld3 from t2 where (fld3 like "C%" and fld3 = "Chantilly");
+fld3
+Chantilly
+select fld1,fld3 from t2 where fld1 like "25050%";
+fld1	fld3
+250501	poisoning
+250502	Iraqis
+250503	heaving
+250504	population
+250505	bomb
+select fld1,fld3 from t2 where fld1 like "25050_";
+fld1	fld3
+250501	poisoning
+250502	Iraqis
+250503	heaving
+250504	population
+250505	bomb
+select distinct companynr from t2;
+companynr
+00
+37
+36
+50
+58
+29
+40
+53
+65
+41
+34
+68
+select distinct companynr from t2 order by companynr;
+companynr
+00
+29
+34
+36
+37
+40
+41
+50
+53
+58
+65
+68
+select distinct companynr from t2 order by companynr desc;
+companynr
+68
+65
+58
+53
+50
+41
+40
+37
+36
+34
+29
+00
+select distinct t2.fld3,period from t2,t1 where companynr=37 and fld3 like "O%";
+fld3	period
+obliterates	9410
+offload	9410
+opaquely	9410
+organizer	9410
+overestimating	9410
+overlay	9410
+select distinct fld3 from t2 where companynr = 34 order by fld3;
+fld3
+absentee
+accessed
+ahead
+alphabetic
+Asiaticizations
+attitude
+aye
+bankruptcies
+belays
+Blythe
+bomb
+boulevard
+bulldozes
+cannot
+caressing
+charcoal
+checksumming
+chess
+clubroom
+colorful
+cosy
+creator
+crying
+Darius
+diffusing
+duality
+Eiffel
+Epiphany
+Ernestine
+explorers
+exterminated
+famine
+forked
+Gershwins
+heaving
+Hodges
+Iraqis
+Italianization
+Lagos
+landslide
+libretto
+Majorca
+mastering
+narrowed
+occurred
+offerers
+Palestine
+Peruvianizes
+pharmaceutic
+poisoning
+population
+Pygmalion
+rats
+realest
+recording
+regimented
+retransmitting
+reviver
+rouses
+scars
+sicker
+sleepwalk
+stopped
+sugars
+translatable
+uncles
+unexpected
+uprisings
+versatility
+vest
+select distinct fld3 from t2 limit 10;
+fld3
+abates
+abiding
+Abraham
+abrogating
+absentee
+abut
+accessed
+accruing
+accumulating
+accuracies
+select distinct fld3 from t2 having fld3 like "A%" limit 10;
+fld3
+abates
+abiding
+Abraham
+abrogating
+absentee
+abut
+accessed
+accruing
+accumulating
+accuracies
+select distinct substring(fld3,1,3) from t2 where fld3 like "A%";
+substring(fld3,1,3)
+aba
+abi
+Abr
+abs
+abu
+acc
+acq
+acu
+Ade
+adj
+Adl
+adm
+Ado
+ads
+adv
+aer
+aff
+afi
+afl
+afo
+agi
+ahe
+aim
+air
+Ald
+alg
+ali
+all
+alp
+alr
+ama
+ame
+amm
+ana
+and
+ane
+Ang
+ani
+Ann
+Ant
+api
+app
+aqu
+Ara
+arc
+Arm
+arr
+Art
+Asi
+ask
+asp
+ass
+ast
+att
+aud
+Aug
+aut
+ave
+avo
+awe
+aye
+Azt
+select distinct substring(fld3,1,3) as a from t2 having a like "A%" order by a limit 10;
+a
+aba
+abi
+Abr
+abs
+abu
+acc
+acq
+acu
+Ade
+adj
+select distinct substring(fld3,1,3) from t2 where fld3 like "A%" limit 10;
+substring(fld3,1,3)
+aba
+abi
+Abr
+abs
+abu
+acc
+acq
+acu
+Ade
+adj
+select distinct substring(fld3,1,3) as a from t2 having a like "A%" limit 10;
+a
+aba
+abi
+Abr
+abs
+abu
+acc
+acq
+acu
+Ade
+adj
+create table t3 (
+period    int not null,
+name      char(32) not null,
+companynr int not null,
+price     double(11,0),
+price2     double(11,0),
+key (period),
+key (name)
+);
+create temporary table tmp engine = myisam select * from t3;
+insert into t3 select * from tmp;
+insert into tmp select * from t3;
+insert into t3 select * from tmp;
+insert into tmp select * from t3;
+insert into t3 select * from tmp;
+insert into tmp select * from t3;
+insert into t3 select * from tmp;
+insert into tmp select * from t3;
+insert into t3 select * from tmp;
+insert into tmp select * from t3;
+insert into t3 select * from tmp;
+insert into tmp select * from t3;
+insert into t3 select * from tmp;
+insert into tmp select * from t3;
+insert into t3 select * from tmp;
+insert into tmp select * from t3;
+insert into t3 select * from tmp;
+alter table t3 add t2nr int not null auto_increment primary key first;
+drop table tmp;
+SET SQL_BIG_TABLES=1;
+select distinct concat(fld3," ",fld3) as namn from t2,t3 where t2.fld1=t3.t2nr order by namn limit 10;
+namn
+Abraham Abraham
+abrogating abrogating
+admonishing admonishing
+Adolph Adolph
+afield afield
+aging aging
+ammonium ammonium
+analyzable analyzable
+animals animals
+animized animized
+SET SQL_BIG_TABLES=0;
+select distinct concat(fld3," ",fld3) from t2,t3 where t2.fld1=t3.t2nr order by fld3 limit 10;
+concat(fld3," ",fld3)
+Abraham Abraham
+abrogating abrogating
+admonishing admonishing
+Adolph Adolph
+afield afield
+aging aging
+ammonium ammonium
+analyzable analyzable
+animals animals
+animized animized
+select distinct fld5 from t2 limit 10;
+fld5
+neat
+Steinberg
+jarring
+tinily
+balled
+persist
+attainments
+fanatic
+measures
+rightfulness
+select distinct fld3,count(*) from t2 group by companynr,fld3 limit 10;
+fld3	count(*)
+affixed	1
+and	1
+annoyers	1
+Anthony	1
+assayed	1
+assurers	1
+attendants	1
+bedlam	1
+bedpost	1
+boasted	1
+SET SQL_BIG_TABLES=1;
+select distinct fld3,count(*) from t2 group by companynr,fld3 limit 10;
+fld3	count(*)
+affixed	1
+and	1
+annoyers	1
+Anthony	1
+assayed	1
+assurers	1
+attendants	1
+bedlam	1
+bedpost	1
+boasted	1
+SET SQL_BIG_TABLES=0;
+select distinct fld3,repeat("a",length(fld3)),count(*) from t2 group by companynr,fld3 limit 100,10;
+fld3	repeat("a",length(fld3))	count(*)
+circus	aaaaaa	1
+cited	aaaaa	1
+Colombo	aaaaaaa	1
+congresswoman	aaaaaaaaaaaaa	1
+contrition	aaaaaaaaaa	1
+corny	aaaaa	1
+cultivation	aaaaaaaaaaa	1
+definiteness	aaaaaaaaaaaa	1
+demultiplex	aaaaaaaaaaa	1
+disappointing	aaaaaaaaaaaaa	1
+select distinct companynr,rtrim(space(512+companynr)) from t3 order by 1,2;
+companynr	rtrim(space(512+companynr))
+37	
+78	
+101	
+154	
+311	
+447	
+512	
+select distinct fld3 from t2,t3 where t2.companynr = 34 and t2.fld1=t3.t2nr order by fld3;
+fld3
+explain select t3.t2nr,fld3 from t2,t3 where t2.companynr = 34 and t2.fld1=t3.t2nr order by t3.t2nr,fld3;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t2	ALL	fld1	NULL	NULL	NULL	1199	Using where; Using temporary; Using filesort
+1	SIMPLE	t3	eq_ref	PRIMARY	PRIMARY	4	test.t2.fld1	1	Using where; Using index
+explain select * from t3 as t1,t3 where t1.period=t3.period order by t3.period;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	ALL	period	NULL	NULL	NULL	41810	Using temporary; Using filesort
+1	SIMPLE	t3	ref	period	period	4	test.t1.period	4181	Using join buffer
+explain select * from t3 as t1,t3 where t1.period=t3.period order by t3.period limit 10;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t3	ALL	period	NULL	NULL	NULL	41810	Using temporary; Using filesort
+1	SIMPLE	t1	ref	period	period	4	test.t3.period	4181	Using join buffer
+explain select * from t3 as t1,t3 where t1.period=t3.period order by t1.period limit 10;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	ALL	period	NULL	NULL	NULL	41810	Using temporary; Using filesort
+1	SIMPLE	t3	ref	period	period	4	test.t1.period	4181	Using join buffer
+select period from t1;
+period
+9410
+select period from t1 where period=1900;
+period
+select fld3,period from t1,t2 where fld1 = 011401 order by period;
+fld3	period
+breaking	9410
+select fld3,period from t2,t3 where t2.fld1 = 011401 and t2.fld1=t3.t2nr and t3.period=1001;
+fld3	period
+breaking	1001
+explain select fld3,period from t2,t3 where t2.fld1 = 011401 and t3.t2nr=t2.fld1 and 1001 = t3.period;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t2	const	fld1	fld1	4	const	1	
+1	SIMPLE	t3	const	PRIMARY,period	PRIMARY	4	const	1	
+select fld3,period from t2,t1 where companynr*10 = 37*10;
+fld3	period
+breaking	9410
+Romans	9410
+intercepted	9410
+bewilderingly	9410
+astound	9410
+admonishing	9410
+sumac	9410
+flanking	9410
+combed	9410
+subjective	9410
+scatterbrain	9410
+Eulerian	9410
+Kane	9410
+overlay	9410
+perturb	9410
+goblins	9410
+annihilates	9410
+Wotan	9410
+snatching	9410
+concludes	9410
+laterally	9410
+yelped	9410
+grazing	9410
+Baird	9410
+celery	9410
+misunderstander	9410
+handgun	9410
+foldout	9410
+mystic	9410
+succumbed	9410
+Nabisco	9410
+fingerings	9410
+aging	9410
+afield	9410
+ammonium	9410
+boat	9410
+intelligibility	9410
+Augustine	9410
+teethe	9410
+dreaded	9410
+scholastics	9410
+audiology	9410
+wallet	9410
+parters	9410
+eschew	9410
+quitter	9410
+neat	9410
+Steinberg	9410
+jarring	9410
+tinily	9410
+balled	9410
+persist	9410
+attainments	9410
+fanatic	9410
+measures	9410
+rightfulness	9410
+capably	9410
+impulsive	9410
+starlet	9410
+terminators	9410
+untying	9410
+announces	9410
+featherweight	9410
+pessimist	9410
+daughter	9410
+decliner	9410
+lawgiver	9410
+stated	9410
+readable	9410
+attrition	9410
+cascade	9410
+motors	9410
+interrogate	9410
+pests	9410
+stairway	9410
+dopers	9410
+testicle	9410
+Parsifal	9410
+leavings	9410
+postulation	9410
+squeaking	9410
+contrasted	9410
+leftover	9410
+whiteners	9410
+erases	9410
+Punjab	9410
+Merritt	9410
+Quixotism	9410
+sweetish	9410
+dogging	9410
+scornfully	9410
+bellow	9410
+bills	9410
+cupboard	9410
+sureties	9410
+puddings	9410
+fetters	9410
+bivalves	9410
+incurring	9410
+Adolph	9410
+pithed	9410
+Miles	9410
+trimmings	9410
+tragedies	9410
+skulking	9410
+flint	9410
+flopping	9410
+relaxing	9410
+offload	9410
+suites	9410
+lists	9410
+animized	9410
+multilayer	9410
+standardizes	9410
+Judas	9410
+vacuuming	9410
+dentally	9410
+humanness	9410
+inch	9410
+Weissmuller	9410
+irresponsibly	9410
+luckily	9410
+culled	9410
+medical	9410
+bloodbath	9410
+subschema	9410
+animals	9410
+Micronesia	9410
+repetitions	9410
+Antares	9410
+ventilate	9410
+pityingly	9410
+interdependent	9410
+Graves	9410
+neonatal	9410
+chafe	9410
+honoring	9410
+realtor	9410
+elite	9410
+funereal	9410
+abrogating	9410
+sorters	9410
+Conley	9410
+lectured	9410
+Abraham	9410
+Hawaii	9410
+cage	9410
+hushes	9410
+Simla	9410
+reporters	9410
+Dutchman	9410
+descendants	9410
+groupings	9410
+dissociate	9410
+coexist	9410
+Beebe	9410
+Taoism	9410
+Connally	9410
+fetched	9410
+checkpoints	9410
+rusting	9410
+galling	9410
+obliterates	9410
+traitor	9410
+resumes	9410
+analyzable	9410
+terminator	9410
+gritty	9410
+firearm	9410
+minima	9410
+Selfridge	9410
+disable	9410
+witchcraft	9410
+betroth	9410
+Manhattanize	9410
+imprint	9410
+peeked	9410
+swelling	9410
+interrelationships	9410
+riser	9410
+Gandhian	9410
+peacock	9410
+bee	9410
+kanji	9410
+dental	9410
+scarf	9410
+chasm	9410
+insolence	9410
+syndicate	9410
+alike	9410
+imperial	9410
+convulsion	9410
+railway	9410
+validate	9410
+normalizes	9410
+comprehensive	9410
+chewing	9410
+denizen	9410
+schemer	9410
+chronicle	9410
+Kline	9410
+Anatole	9410
+partridges	9410
+brunch	9410
+recruited	9410
+dimensions	9410
+Chicana	9410
+announced	9410
+praised	9410
+employing	9410
+linear	9410
+quagmire	9410
+western	9410
+relishing	9410
+serving	9410
+scheduling	9410
+lore	9410
+eventful	9410
+arteriole	9410
+disentangle	9410
+cured	9410
+Fenton	9410
+avoidable	9410
+drains	9410
+detectably	9410
+husky	9410
+impelling	9410
+undoes	9410
+evened	9410
+squeezes	9410
+destroyer	9410
+rudeness	9410
+beaner	9410
+boorish	9410
+Everhart	9410
+encompass	9410
+mushrooms	9410
+Alison	9410
+externally	9410
+pellagra	9410
+cult	9410
+creek	9410
+Huffman	9410
+Majorca	9410
+governing	9410
+gadfly	9410
+reassigned	9410
+intentness	9410
+craziness	9410
+psychic	9410
+squabbled	9410
+burlesque	9410
+capped	9410
+extracted	9410
+DiMaggio	9410
+exclamation	9410
+subdirectory	9410
+Gothicism	9410
+feminine	9410
+metaphysically	9410
+sanding	9410
+Miltonism	9410
+freakish	9410
+index	9410
+straight	9410
+flurried	9410
+denotative	9410
+coming	9410
+commencements	9410
+gentleman	9410
+gifted	9410
+Shanghais	9410
+sportswriting	9410
+sloping	9410
+navies	9410
+leaflet	9410
+shooter	9410
+Joplin	9410
+babies	9410
+assails	9410
+admiring	9410
+swaying	9410
+Goldstine	9410
+fitting	9410
+Norwalk	9410
+analogy	9410
+deludes	9410
+cokes	9410
+Clayton	9410
+exhausts	9410
+causality	9410
+sating	9410
+icon	9410
+throttles	9410
+communicants	9410
+dehydrate	9410
+priceless	9410
+publicly	9410
+incidentals	9410
+commonplace	9410
+mumbles	9410
+furthermore	9410
+cautioned	9410
+parametrized	9410
+registration	9410
+sadly	9410
+positioning	9410
+babysitting	9410
+eternal	9410
+hoarder	9410
+congregates	9410
+rains	9410
+workers	9410
+sags	9410
+unplug	9410
+garage	9410
+boulder	9410
+specifics	9410
+Teresa	9410
+Winsett	9410
+convenient	9410
+buckboards	9410
+amenities	9410
+resplendent	9410
+sews	9410
+participated	9410
+Simon	9410
+certificates	9410
+Fitzpatrick	9410
+Evanston	9410
+misted	9410
+textures	9410
+save	9410
+count	9410
+rightful	9410
+chaperone	9410
+Lizzy	9410
+clenched	9410
+effortlessly	9410
+accessed	9410
+beaters	9410
+Hornblower	9410
+vests	9410
+indulgences	9410
+infallibly	9410
+unwilling	9410
+excrete	9410
+spools	9410
+crunches	9410
+overestimating	9410
+ineffective	9410
+humiliation	9410
+sophomore	9410
+star	9410
+rifles	9410
+dialysis	9410
+arriving	9410
+indulge	9410
+clockers	9410
+languages	9410
+Antarctica	9410
+percentage	9410
+ceiling	9410
+specification	9410
+regimented	9410
+ciphers	9410
+pictures	9410
+serpents	9410
+allot	9410
+realized	9410
+mayoral	9410
+opaquely	9410
+hostess	9410
+fiftieth	9410
+incorrectly	9410
+decomposition	9410
+stranglings	9410
+mixture	9410
+electroencephalography	9410
+similarities	9410
+charges	9410
+freest	9410
+Greenberg	9410
+tinting	9410
+expelled	9410
+warm	9410
+smoothed	9410
+deductions	9410
+Romano	9410
+bitterroot	9410
+corset	9410
+securing	9410
+environing	9410
+cute	9410
+Crays	9410
+heiress	9410
+inform	9410
+avenge	9410
+universals	9410
+Kinsey	9410
+ravines	9410
+bestseller	9410
+equilibrium	9410
+extents	9410
+relatively	9410
+pressure	9410
+critiques	9410
+befouled	9410
+rightfully	9410
+mechanizing	9410
+Latinizes	9410
+timesharing	9410
+Aden	9410
+embassies	9410
+males	9410
+shapelessly	9410
+mastering	9410
+Newtonian	9410
+finishers	9410
+abates	9410
+teem	9410
+kiting	9410
+stodgy	9410
+feed	9410
+guitars	9410
+airships	9410
+store	9410
+denounces	9410
+Pyle	9410
+Saxony	9410
+serializations	9410
+Peruvian	9410
+taxonomically	9410
+kingdom	9410
+stint	9410
+Sault	9410
+faithful	9410
+Ganymede	9410
+tidiness	9410
+gainful	9410
+contrary	9410
+Tipperary	9410
+tropics	9410
+theorizers	9410
+renew	9410
+already	9410
+terminal	9410
+Hegelian	9410
+hypothesizer	9410
+warningly	9410
+journalizing	9410
+nested	9410
+Lars	9410
+saplings	9410
+foothill	9410
+labeled	9410
+imperiously	9410
+reporters	9410
+furnishings	9410
+precipitable	9410
+discounts	9410
+excises	9410
+Stalin	9410
+despot	9410
+ripeness	9410
+Arabia	9410
+unruly	9410
+mournfulness	9410
+boom	9410
+slaughter	9410
+Sabine	9410
+handy	9410
+rural	9410
+organizer	9410
+shipyard	9410
+civics	9410
+inaccuracy	9410
+rules	9410
+juveniles	9410
+comprised	9410
+investigations	9410
+stabilizes	9410
+seminaries	9410
+Hunter	9410
+sporty	9410
+test	9410
+weasels	9410
+CERN	9410
+tempering	9410
+afore	9410
+Galatean	9410
+techniques	9410
+error	9410
+veranda	9410
+severely	9410
+Cassites	9410
+forthcoming	9410
+guides	9410
+vanish	9410
+lied	9410
+sawtooth	9410
+fated	9410
+gradually	9410
+widens	9410
+preclude	9410
+evenhandedly	9410
+percentage	9410
+disobedience	9410
+humility	9410
+gleaning	9410
+petted	9410
+bloater	9410
+minion	9410
+marginal	9410
+apiary	9410
+measures	9410
+precaution	9410
+repelled	9410
+primary	9410
+coverings	9410
+Artemia	9410
+navigate	9410
+spatial	9410
+Gurkha	9410
+meanwhile	9410
+Melinda	9410
+Butterfield	9410
+Aldrich	9410
+previewing	9410
+glut	9410
+unaffected	9410
+inmate	9410
+mineral	9410
+impending	9410
+meditation	9410
+ideas	9410
+miniaturizes	9410
+lewdly	9410
+title	9410
+youthfulness	9410
+creak	9410
+Chippewa	9410
+clamored	9410
+freezes	9410
+forgivably	9410
+reduce	9410
+McGovern	9410
+Nazis	9410
+epistle	9410
+socializes	9410
+conceptions	9410
+Kevin	9410
+uncovering	9410
+chews	9410
+appendixes	9410
+appendixes	9410
+appendixes	9410
+appendixes	9410
+appendixes	9410
+appendixes	9410
+raining	9410
+infest	9410
+compartment	9410
+minting	9410
+ducks	9410
+roped	9410
+waltz	9410
+Lillian	9410
+repressions	9410
+chillingly	9410
+noncritical	9410
+lithograph	9410
+spongers	9410
+parenthood	9410
+posed	9410
+instruments	9410
+filial	9410
+fixedly	9410
+relives	9410
+Pandora	9410
+watering	9410
+ungrateful	9410
+secures	9410
+poison	9410
+dusted	9410
+encompasses	9410
+presentation	9410
+Kantian	9410
+select fld3,period,price,price2 from t2,t3 where t2.fld1=t3.t2nr and period >= 1001 and period <= 1002 and t2.companynr = 37 order by fld3,period, price;
+fld3	period	price	price2
+admonishing	1002	28357832	8723648
+analyzable	1002	28357832	8723648
+annihilates	1001	5987435	234724
+Antares	1002	28357832	8723648
+astound	1001	5987435	234724
+audiology	1001	5987435	234724
+Augustine	1002	28357832	8723648
+Baird	1002	28357832	8723648
+bewilderingly	1001	5987435	234724
+breaking	1001	5987435	234724
+Conley	1001	5987435	234724
+dentally	1002	28357832	8723648
+dissociate	1002	28357832	8723648
+elite	1001	5987435	234724
+eschew	1001	5987435	234724
+Eulerian	1001	5987435	234724
+flanking	1001	5987435	234724
+foldout	1002	28357832	8723648
+funereal	1002	28357832	8723648
+galling	1002	28357832	8723648
+Graves	1001	5987435	234724
+grazing	1001	5987435	234724
+groupings	1001	5987435	234724
+handgun	1001	5987435	234724
+humility	1002	28357832	8723648
+impulsive	1002	28357832	8723648
+inch	1001	5987435	234724
+intelligibility	1001	5987435	234724
+jarring	1001	5987435	234724
+lawgiver	1001	5987435	234724
+lectured	1002	28357832	8723648
+Merritt	1002	28357832	8723648
+neonatal	1001	5987435	234724
+offload	1002	28357832	8723648
+parters	1002	28357832	8723648
+pityingly	1002	28357832	8723648
+puddings	1002	28357832	8723648
+Punjab	1001	5987435	234724
+quitter	1002	28357832	8723648
+realtor	1001	5987435	234724
+relaxing	1001	5987435	234724
+repetitions	1001	5987435	234724
+resumes	1001	5987435	234724
+Romans	1002	28357832	8723648
+rusting	1001	5987435	234724
+scholastics	1001	5987435	234724
+skulking	1002	28357832	8723648
+stated	1002	28357832	8723648
+suites	1002	28357832	8723648
+sureties	1001	5987435	234724
+testicle	1002	28357832	8723648
+tinily	1002	28357832	8723648
+tragedies	1001	5987435	234724
+trimmings	1001	5987435	234724
+vacuuming	1001	5987435	234724
+ventilate	1001	5987435	234724
+wallet	1001	5987435	234724
+Weissmuller	1002	28357832	8723648
+Wotan	1002	28357832	8723648
+select t2.fld1,fld3,period,price,price2 from t2,t3 where t2.fld1>= 18201 and t2.fld1 <= 18811 and t2.fld1=t3.t2nr and period = 1001 and t2.companynr = 37;
+fld1	fld3	period	price	price2
+018201	relaxing	1001	5987435	234724
+018601	vacuuming	1001	5987435	234724
+018801	inch	1001	5987435	234724
+018811	repetitions	1001	5987435	234724
+create table t4 (
+companynr tinyint(2) unsigned zerofill NOT NULL default '00',
+companyname char(30) NOT NULL default '',
+PRIMARY KEY (companynr),
+UNIQUE KEY companyname(companyname)
+) ENGINE=MyISAM MAX_ROWS=50 PACK_KEYS=1 COMMENT='companynames';
+select STRAIGHT_JOIN t2.companynr,companyname from t4,t2 where t2.companynr=t4.companynr group by t2.companynr;
+companynr	companyname
+00	Unknown
+29	company 1
+34	company 2
+36	company 3
+37	company 4
+40	company 5
+41	company 6
+50	company 11
+53	company 7
+58	company 8
+65	company 9
+68	company 10
+select SQL_SMALL_RESULT t2.companynr,companyname from t4,t2 where t2.companynr=t4.companynr group by t2.companynr;
+companynr	companyname
+00	Unknown
+29	company 1
+34	company 2
+36	company 3
+37	company 4
+40	company 5
+41	company 6
+50	company 11
+53	company 7
+58	company 8
+65	company 9
+68	company 10
+select * from t1,t1 t12;
+Period	Varor_period	Period	Varor_period
+9410	9412	9410	9412
+select t2.fld1,t22.fld1 from t2,t2 t22 where t2.fld1 >= 250501 and t2.fld1 <= 250505 and t22.fld1 >= 250501 and t22.fld1 <= 250505;
+fld1	fld1
+250501	250501
+250502	250501
+250503	250501
+250504	250501
+250505	250501
+250501	250502
+250502	250502
+250503	250502
+250504	250502
+250505	250502
+250501	250503
+250502	250503
+250503	250503
+250504	250503
+250505	250503
+250501	250504
+250502	250504
+250503	250504
+250504	250504
+250505	250504
+250501	250505
+250502	250505
+250503	250505
+250504	250505
+250505	250505
+insert into t2 (fld1, companynr) values (999999,99);
+select t2.companynr,companyname from t2 left join t4 using (companynr) where t4.companynr is null;
+companynr	companyname
+99	NULL
+select count(*) from t2 left join t4 using (companynr) where t4.companynr is not null;
+count(*)
+1199
+explain select t2.companynr,companyname from t2 left join t4 using (companynr) where t4.companynr is null;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	1200	
+1	SIMPLE	t4	eq_ref	PRIMARY	PRIMARY	1	test.t2.companynr	1	Using where; Not exists; Using join buffer
+explain select t2.companynr,companyname from t4 left join t2 using (companynr) where t2.companynr is null;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	12	
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	1200	Using where; Not exists; Using join buffer
+select companynr,companyname from t2 left join t4 using (companynr) where companynr is null;
+companynr	companyname
+select count(*) from t2 left join t4 using (companynr) where companynr is not null;
+count(*)
+1200
+explain select companynr,companyname from t2 left join t4 using (companynr) where companynr is null;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE
+explain select companynr,companyname from t4 left join t2 using (companynr) where companynr is null;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE
+delete from t2 where fld1=999999;
+explain select t2.companynr,companyname from t4 left join t2 using (companynr) where t2.companynr > 0;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	1199	Using where
+1	SIMPLE	t4	eq_ref	PRIMARY	PRIMARY	1	test.t2.companynr	1	Using join buffer
+explain select t2.companynr,companyname from t4 left join t2 using (companynr) where t2.companynr > 0 or t2.companynr < 0;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	1199	Using where
+1	SIMPLE	t4	eq_ref	PRIMARY	PRIMARY	1	test.t2.companynr	1	Using join buffer
+explain select t2.companynr,companyname from t4 left join t2 using (companynr) where t2.companynr > 0 and t4.companynr > 0;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	1199	Using where
+1	SIMPLE	t4	eq_ref	PRIMARY	PRIMARY	1	test.t2.companynr	1	Using join buffer
+explain select companynr,companyname from t4 left join t2 using (companynr) where companynr > 0;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t4	ALL	PRIMARY	NULL	NULL	NULL	12	Using where
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	1199	Using where; Using join buffer
+explain select companynr,companyname from t4 left join t2 using (companynr) where companynr > 0 or companynr < 0;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t4	ALL	PRIMARY	NULL	NULL	NULL	12	Using where
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	1199	Using where; Using join buffer
+explain select companynr,companyname from t4 left join t2 using (companynr) where companynr > 0 and companynr > 0;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t4	ALL	PRIMARY	NULL	NULL	NULL	12	Using where
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	1199	Using where; Using join buffer
+explain select t2.companynr,companyname from t4 left join t2 using (companynr) where t2.companynr > 0 or t2.companynr is null;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	12	
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	1199	Using where; Using join buffer
+explain select t2.companynr,companyname from t4 left join t2 using (companynr) where t2.companynr > 0 or t2.companynr < 0 or t4.companynr > 0;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t4	ALL	PRIMARY	NULL	NULL	NULL	12	
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	1199	Using where; Using join buffer
+explain select t2.companynr,companyname from t4 left join t2 using (companynr) where ifnull(t2.companynr,1)>0;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	12	
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	1199	Using where; Using join buffer
+explain select companynr,companyname from t4 left join t2 using (companynr) where companynr > 0 or companynr is null;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t4	ALL	PRIMARY	NULL	NULL	NULL	12	Using where
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	1199	Using where; Using join buffer
+explain select companynr,companyname from t4 left join t2 using (companynr) where companynr > 0 or companynr < 0 or companynr > 0;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t4	ALL	PRIMARY	NULL	NULL	NULL	12	Using where
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	1199	Using where; Using join buffer
+explain select companynr,companyname from t4 left join t2 using (companynr) where ifnull(companynr,1)>0;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	12	Using where
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	1199	Using where; Using join buffer
+select distinct t2.companynr,t4.companynr from t2,t4 where t2.companynr=t4.companynr+1;
+companynr	companynr
+37	36
+41	40
+explain select distinct t2.companynr,t4.companynr from t2,t4 where t2.companynr=t4.companynr+1;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t4	index	NULL	PRIMARY	1	NULL	12	Using index; Using temporary
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	1199	Using where; Using join buffer
+select t2.fld1,t2.companynr,fld3,period from t3,t2 where t2.fld1 = 38208 and t2.fld1=t3.t2nr and period = 1008 or t2.fld1 = 38008 and t2.fld1 =t3.t2nr and period = 1008;
+fld1	companynr	fld3	period
+038008	37	reporters	1008
+038208	37	Selfridge	1008
+select t2.fld1,t2.companynr,fld3,period from t3,t2 where (t2.fld1 = 38208 or t2.fld1 = 38008) and t2.fld1=t3.t2nr and period>=1008 and period<=1009;
+fld1	companynr	fld3	period
+038008	37	reporters	1008
+038208	37	Selfridge	1008
+select t2.fld1,t2.companynr,fld3,period from t3,t2 where (t3.t2nr = 38208 or t3.t2nr = 38008) and t2.fld1=t3.t2nr and period>=1008 and period<=1009;
+fld1	companynr	fld3	period
+038008	37	reporters	1008
+038208	37	Selfridge	1008
+select period from t1 where (((period > 0) or period < 10000 or (period = 1900)) and (period=1900 and period <= 1901) or (period=1903 and (period=1903)) and period>=1902) or ((period=1904 or period=1905) or (period=1906 or period>1907)) or (period=1908 and period = 1909);
+period
+9410
+select period from t1 where ((period > 0 and period < 1) or (((period > 0 and period < 100) and (period > 10)) or (period > 10)) or (period > 0 and (period > 5 or period > 6)));
+period
+9410
+select a.fld1 from t2 as a,t2 b where ((a.fld1 = 250501 and a.fld1=b.fld1) or a.fld1=250502 or a.fld1=250503 or (a.fld1=250505 and a.fld1<=b.fld1 and b.fld1>=a.fld1)) and a.fld1=b.fld1;
+fld1
+250501
+250502
+250503
+250505
+select fld1 from t2 where fld1 in (250502,98005,98006,250503,250605,250606) and fld1 >=250502 and fld1 not in (250605,250606);
+fld1
+250502
+250503
+select fld1 from t2 where fld1 between 250502 and 250504;
+fld1
+250502
+250503
+250504
+select fld3 from t2 where (((fld3 like "_%L%" ) or (fld3 like "%ok%")) and ( fld3 like "L%" or fld3 like "G%")) and fld3 like "L%" ;
+fld3
+label
+labeled
+labeled
+landslide
+laterally
+leaflet
+lewdly
+Lillian
+luckily
+select count(*) from t1;
+count(*)
+1
+select companynr,count(*),sum(fld1) from t2 group by companynr;
+companynr	count(*)	sum(fld1)
+00	82	10355753
+29	95	14473298
+34	70	17788966
+36	215	22786296
+37	588	83602098
+40	37	6618386
+41	52	12816335
+50	11	1595438
+53	4	793210
+58	23	2254293
+65	10	2284055
+68	12	3097288
+select companynr,count(*) from t2 group by companynr order by companynr desc limit 5;
+companynr	count(*)
+68	12
+65	10
+58	23
+53	4
+50	11
+select count(*),min(fld4),max(fld4),sum(fld1),avg(fld1),std(fld1),variance(fld1) from t2 where companynr = 34 and fld4<>"";
+count(*)	min(fld4)	max(fld4)	sum(fld1)	avg(fld1)	std(fld1)	variance(fld1)
+70	absentee	vest	17788966	254128.0857	3272.5940	10709871.3069
+explain extended select count(*),min(fld4),max(fld4),sum(fld1),avg(fld1),std(fld1),variance(fld1) from t2 where companynr = 34 and fld4<>"";
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	1199	100.00	Using where
+Warnings:
+Note	1003	select count(0) AS `count(*)`,min(`test`.`t2`.`fld4`) AS `min(fld4)`,max(`test`.`t2`.`fld4`) AS `max(fld4)`,sum(`test`.`t2`.`fld1`) AS `sum(fld1)`,avg(`test`.`t2`.`fld1`) AS `avg(fld1)`,std(`test`.`t2`.`fld1`) AS `std(fld1)`,variance(`test`.`t2`.`fld1`) AS `variance(fld1)` from `test`.`t2` where ((`test`.`t2`.`companynr` = 34) and (`test`.`t2`.`fld4` <> ''))
+select companynr,count(*),min(fld4),max(fld4),sum(fld1),avg(fld1),std(fld1),variance(fld1) from t2 group by companynr limit 3;
+companynr	count(*)	min(fld4)	max(fld4)	sum(fld1)	avg(fld1)	std(fld1)	variance(fld1)
+00	82	Anthony	windmills	10355753	126289.6707	115550.9757	13352027981.7087
+29	95	abut	wetness	14473298	152350.5053	8368.5480	70032594.9026
+34	70	absentee	vest	17788966	254128.0857	3272.5940	10709871.3069
+select companynr,t2nr,count(price),sum(price),min(price),max(price),avg(price) from t3 where companynr = 37 group by companynr,t2nr limit 10;
+companynr	t2nr	count(price)	sum(price)	min(price)	max(price)	avg(price)
+37	1	1	5987435	5987435	5987435	5987435.0000
+37	2	1	28357832	28357832	28357832	28357832.0000
+37	3	1	39654943	39654943	39654943	39654943.0000
+37	11	1	5987435	5987435	5987435	5987435.0000
+37	12	1	28357832	28357832	28357832	28357832.0000
+37	13	1	39654943	39654943	39654943	39654943.0000
+37	21	1	5987435	5987435	5987435	5987435.0000
+37	22	1	28357832	28357832	28357832	28357832.0000
+37	23	1	39654943	39654943	39654943	39654943.0000
+37	31	1	5987435	5987435	5987435	5987435.0000
+select /*! SQL_SMALL_RESULT */ companynr,t2nr,count(price),sum(price),min(price),max(price),avg(price) from t3 where companynr = 37 group by companynr,t2nr limit 10;
+companynr	t2nr	count(price)	sum(price)	min(price)	max(price)	avg(price)
+37	1	1	5987435	5987435	5987435	5987435.0000
+37	2	1	28357832	28357832	28357832	28357832.0000
+37	3	1	39654943	39654943	39654943	39654943.0000
+37	11	1	5987435	5987435	5987435	5987435.0000
+37	12	1	28357832	28357832	28357832	28357832.0000
+37	13	1	39654943	39654943	39654943	39654943.0000
+37	21	1	5987435	5987435	5987435	5987435.0000
+37	22	1	28357832	28357832	28357832	28357832.0000
+37	23	1	39654943	39654943	39654943	39654943.0000
+37	31	1	5987435	5987435	5987435	5987435.0000
+select companynr,count(price),sum(price),min(price),max(price),avg(price) from t3 group by companynr ;
+companynr	count(price)	sum(price)	min(price)	max(price)	avg(price)
+37	12543	309394878010	5987435	39654943	24666736.6667
+78	8362	414611089292	726498	98439034	49582766.0000
+101	4181	3489454238	834598	834598	834598.0000
+154	4181	4112197254950	983543950	983543950	983543950.0000
+311	4181	979599938	234298	234298	234298.0000
+447	4181	9929180954	2374834	2374834	2374834.0000
+512	4181	3288532102	786542	786542	786542.0000
+select distinct mod(companynr,10) from t4 group by companynr;
+mod(companynr,10)
+0
+9
+4
+6
+7
+1
+3
+8
+5
+select distinct 1 from t4 group by companynr;
+1
+1
+select count(distinct fld1) from t2;
+count(distinct fld1)
+1199
+select companynr,count(distinct fld1) from t2 group by companynr;
+companynr	count(distinct fld1)
+00	82
+29	95
+34	70
+36	215
+37	588
+40	37
+41	52
+50	11
+53	4
+58	23
+65	10
+68	12
+select companynr,count(*) from t2 group by companynr;
+companynr	count(*)
+00	82
+29	95
+34	70
+36	215
+37	588
+40	37
+41	52
+50	11
+53	4
+58	23
+65	10
+68	12
+select companynr,count(distinct concat(fld1,repeat(65,1000))) from t2 group by companynr;
+companynr	count(distinct concat(fld1,repeat(65,1000)))
+00	82
+29	95
+34	70
+36	215
+37	588
+40	37
+41	52
+50	11
+53	4
+58	23
+65	10
+68	12
+select companynr,count(distinct concat(fld1,repeat(65,200))) from t2 group by companynr;
+companynr	count(distinct concat(fld1,repeat(65,200)))
+00	82
+29	95
+34	70
+36	215
+37	588
+40	37
+41	52
+50	11
+53	4
+58	23
+65	10
+68	12
+select companynr,count(distinct floor(fld1/100)) from t2 group by companynr;
+companynr	count(distinct floor(fld1/100))
+00	47
+29	35
+34	14
+36	69
+37	108
+40	16
+41	11
+50	9
+53	1
+58	1
+65	1
+68	1
+select companynr,count(distinct concat(repeat(65,1000),floor(fld1/100))) from t2 group by companynr;
+companynr	count(distinct concat(repeat(65,1000),floor(fld1/100)))
+00	47
+29	35
+34	14
+36	69
+37	108
+40	16
+41	11
+50	9
+53	1
+58	1
+65	1
+68	1
+select sum(fld1),fld3 from t2 where fld3="Romans" group by fld1 limit 10;
+sum(fld1)	fld3
+11402	Romans
+select name,count(*) from t3 where name='cloakroom' group by name;
+name	count(*)
+cloakroom	4181
+select name,count(*) from t3 where name='cloakroom' and price>10 group by name;
+name	count(*)
+cloakroom	4181
+select count(*) from t3 where name='cloakroom' and price2=823742;
+count(*)
+4181
+select name,count(*) from t3 where name='cloakroom' and price2=823742 group by name;
+name	count(*)
+cloakroom	4181
+select name,count(*) from t3 where name >= "extramarital" and price <= 39654943 group by name;
+name	count(*)
+extramarital	4181
+gazer	4181
+gems	4181
+Iranizes	4181
+spates	4181
+tucked	4181
+violinist	4181
+select t2.fld3,count(*) from t2,t3 where t2.fld1=158402 and t3.name=t2.fld3 group by t3.name;
+fld3	count(*)
+spates	4181
+select companynr|0,companyname from t4 group by 1;
+companynr|0	companyname
+0	Unknown
+29	company 1
+34	company 2
+36	company 3
+37	company 4
+40	company 5
+41	company 6
+50	company 11
+53	company 7
+58	company 8
+65	company 9
+68	company 10
+select t2.companynr,companyname,count(*) from t2,t4 where t2.companynr=t4.companynr group by t2.companynr order by companyname;
+companynr	companyname	count(*)
+29	company 1	95
+68	company 10	12
+50	company 11	11
+34	company 2	70
+36	company 3	215
+37	company 4	588
+40	company 5	37
+41	company 6	52
+53	company 7	4
+58	company 8	23
+65	company 9	10
+00	Unknown	82
+select t2.fld1,count(*) from t2,t3 where t2.fld1=158402 and t3.name=t2.fld3 group by t3.name;
+fld1	count(*)
+158402	4181
+select sum(Period)/count(*) from t1;
+sum(Period)/count(*)
+9410.0000
+select companynr,count(price) as "count",sum(price) as "sum" ,abs(sum(price)/count(price)-avg(price)) as "diff",(0+count(price))*companynr as func from t3 group by companynr;
+companynr	count	sum	diff	func
+37	12543	309394878010	0.0000	464091
+78	8362	414611089292	0.0000	652236
+101	4181	3489454238	0.0000	422281
+154	4181	4112197254950	0.0000	643874
+311	4181	979599938	0.0000	1300291
+447	4181	9929180954	0.0000	1868907
+512	4181	3288532102	0.0000	2140672
+select companynr,sum(price)/count(price) as avg from t3 group by companynr having avg > 70000000 order by avg;
+companynr	avg
+154	983543950.0000
+select companynr,count(*) from t2 group by companynr order by 2 desc;
+companynr	count(*)
+37	588
+36	215
+29	95
+00	82
+34	70
+41	52
+40	37
+58	23
+68	12
+50	11
+65	10
+53	4
+select companynr,count(*) from t2 where companynr > 40 group by companynr order by 2 desc;
+companynr	count(*)
+41	52
+58	23
+68	12
+50	11
+65	10
+53	4
+select t2.fld4,t2.fld1,count(price),sum(price),min(price),max(price),avg(price) from t3,t2 where t3.companynr = 37 and t2.fld1 = t3.t2nr group by fld1,t2.fld4;
+fld4	fld1	count(price)	sum(price)	min(price)	max(price)	avg(price)
+teethe	000001	1	5987435	5987435	5987435	5987435.0000
+dreaded	011401	1	5987435	5987435	5987435	5987435.0000
+scholastics	011402	1	28357832	28357832	28357832	28357832.0000
+audiology	011403	1	39654943	39654943	39654943	39654943.0000
+wallet	011501	1	5987435	5987435	5987435	5987435.0000
+parters	011701	1	5987435	5987435	5987435	5987435.0000
+eschew	011702	1	28357832	28357832	28357832	28357832.0000
+quitter	011703	1	39654943	39654943	39654943	39654943.0000
+neat	012001	1	5987435	5987435	5987435	5987435.0000
+Steinberg	012003	1	39654943	39654943	39654943	39654943.0000
+balled	012301	1	5987435	5987435	5987435	5987435.0000
+persist	012302	1	28357832	28357832	28357832	28357832.0000
+attainments	012303	1	39654943	39654943	39654943	39654943.0000
+capably	012501	1	5987435	5987435	5987435	5987435.0000
+impulsive	012602	1	28357832	28357832	28357832	28357832.0000
+starlet	012603	1	39654943	39654943	39654943	39654943.0000
+featherweight	012701	1	5987435	5987435	5987435	5987435.0000
+pessimist	012702	1	28357832	28357832	28357832	28357832.0000
+daughter	012703	1	39654943	39654943	39654943	39654943.0000
+lawgiver	013601	1	5987435	5987435	5987435	5987435.0000
+stated	013602	1	28357832	28357832	28357832	28357832.0000
+readable	013603	1	39654943	39654943	39654943	39654943.0000
+testicle	013801	1	5987435	5987435	5987435	5987435.0000
+Parsifal	013802	1	28357832	28357832	28357832	28357832.0000
+leavings	013803	1	39654943	39654943	39654943	39654943.0000
+squeaking	013901	1	5987435	5987435	5987435	5987435.0000
+contrasted	016001	1	5987435	5987435	5987435	5987435.0000
+leftover	016201	1	5987435	5987435	5987435	5987435.0000
+whiteners	016202	1	28357832	28357832	28357832	28357832.0000
+erases	016301	1	5987435	5987435	5987435	5987435.0000
+Punjab	016302	1	28357832	28357832	28357832	28357832.0000
+Merritt	016303	1	39654943	39654943	39654943	39654943.0000
+sweetish	018001	1	5987435	5987435	5987435	5987435.0000
+dogging	018002	1	28357832	28357832	28357832	28357832.0000
+scornfully	018003	1	39654943	39654943	39654943	39654943.0000
+fetters	018012	1	28357832	28357832	28357832	28357832.0000
+bivalves	018013	1	39654943	39654943	39654943	39654943.0000
+skulking	018021	1	5987435	5987435	5987435	5987435.0000
+flint	018022	1	28357832	28357832	28357832	28357832.0000
+flopping	018023	1	39654943	39654943	39654943	39654943.0000
+Judas	018032	1	28357832	28357832	28357832	28357832.0000
+vacuuming	018033	1	39654943	39654943	39654943	39654943.0000
+medical	018041	1	5987435	5987435	5987435	5987435.0000
+bloodbath	018042	1	28357832	28357832	28357832	28357832.0000
+subschema	018043	1	39654943	39654943	39654943	39654943.0000
+interdependent	018051	1	5987435	5987435	5987435	5987435.0000
+Graves	018052	1	28357832	28357832	28357832	28357832.0000
+neonatal	018053	1	39654943	39654943	39654943	39654943.0000
+sorters	018061	1	5987435	5987435	5987435	5987435.0000
+epistle	018062	1	28357832	28357832	28357832	28357832.0000
+Conley	018101	1	5987435	5987435	5987435	5987435.0000
+lectured	018102	1	28357832	28357832	28357832	28357832.0000
+Abraham	018103	1	39654943	39654943	39654943	39654943.0000
+cage	018201	1	5987435	5987435	5987435	5987435.0000
+hushes	018202	1	28357832	28357832	28357832	28357832.0000
+Simla	018402	1	28357832	28357832	28357832	28357832.0000
+reporters	018403	1	39654943	39654943	39654943	39654943.0000
+coexist	018601	1	5987435	5987435	5987435	5987435.0000
+Beebe	018602	1	28357832	28357832	28357832	28357832.0000
+Taoism	018603	1	39654943	39654943	39654943	39654943.0000
+Connally	018801	1	5987435	5987435	5987435	5987435.0000
+fetched	018802	1	28357832	28357832	28357832	28357832.0000
+checkpoints	018803	1	39654943	39654943	39654943	39654943.0000
+gritty	018811	1	5987435	5987435	5987435	5987435.0000
+firearm	018812	1	28357832	28357832	28357832	28357832.0000
+minima	019101	1	5987435	5987435	5987435	5987435.0000
+Selfridge	019102	1	28357832	28357832	28357832	28357832.0000
+disable	019103	1	39654943	39654943	39654943	39654943.0000
+witchcraft	019201	1	5987435	5987435	5987435	5987435.0000
+betroth	030501	1	5987435	5987435	5987435	5987435.0000
+Manhattanize	030502	1	28357832	28357832	28357832	28357832.0000
+imprint	030503	1	39654943	39654943	39654943	39654943.0000
+swelling	031901	1	5987435	5987435	5987435	5987435.0000
+interrelationships	036001	1	5987435	5987435	5987435	5987435.0000
+riser	036002	1	28357832	28357832	28357832	28357832.0000
+bee	038001	1	5987435	5987435	5987435	5987435.0000
+kanji	038002	1	28357832	28357832	28357832	28357832.0000
+dental	038003	1	39654943	39654943	39654943	39654943.0000
+railway	038011	1	5987435	5987435	5987435	5987435.0000
+validate	038012	1	28357832	28357832	28357832	28357832.0000
+normalizes	038013	1	39654943	39654943	39654943	39654943.0000
+Kline	038101	1	5987435	5987435	5987435	5987435.0000
+Anatole	038102	1	28357832	28357832	28357832	28357832.0000
+partridges	038103	1	39654943	39654943	39654943	39654943.0000
+recruited	038201	1	5987435	5987435	5987435	5987435.0000
+dimensions	038202	1	28357832	28357832	28357832	28357832.0000
+Chicana	038203	1	39654943	39654943	39654943	39654943.0000
+select t3.companynr,fld3,sum(price) from t3,t2 where t2.fld1 = t3.t2nr and t3.companynr = 512 group by companynr,fld3;
+companynr	fld3	sum(price)
+512	boat	786542
+512	capably	786542
+512	cupboard	786542
+512	decliner	786542
+512	descendants	786542
+512	dopers	786542
+512	erases	786542
+512	Micronesia	786542
+512	Miles	786542
+512	skies	786542
+select t2.companynr,count(*),min(fld3),max(fld3),sum(price),avg(price) from t2,t3 where t3.companynr >= 30 and t3.companynr <= 58 and t3.t2nr = t2.fld1 and 1+1=2 group by t2.companynr;
+companynr	count(*)	min(fld3)	max(fld3)	sum(price)	avg(price)
+00	1	Omaha	Omaha	5987435	5987435.0000
+36	1	dubbed	dubbed	28357832	28357832.0000
+37	83	Abraham	Wotan	1908978016	22999735.1325
+50	2	scribbled	tapestry	68012775	34006387.5000
+select t3.companynr+0,t3.t2nr,fld3,sum(price) from t3,t2 where t2.fld1 = t3.t2nr and t3.companynr = 37 group by 1,t3.t2nr,fld3,fld3,fld3,fld3,fld3 order by fld1;
+t3.companynr+0	t2nr	fld3	sum(price)
+37	1	Omaha	5987435
+37	11401	breaking	5987435
+37	11402	Romans	28357832
+37	11403	intercepted	39654943
+37	11501	bewilderingly	5987435
+37	11701	astound	5987435
+37	11702	admonishing	28357832
+37	11703	sumac	39654943
+37	12001	flanking	5987435
+37	12003	combed	39654943
+37	12301	Eulerian	5987435
+37	12302	dubbed	28357832
+37	12303	Kane	39654943
+37	12501	annihilates	5987435
+37	12602	Wotan	28357832
+37	12603	snatching	39654943
+37	12701	grazing	5987435
+37	12702	Baird	28357832
+37	12703	celery	39654943
+37	13601	handgun	5987435
+37	13602	foldout	28357832
+37	13603	mystic	39654943
+37	13801	intelligibility	5987435
+37	13802	Augustine	28357832
+37	13803	teethe	39654943
+37	13901	scholastics	5987435
+37	16001	audiology	5987435
+37	16201	wallet	5987435
+37	16202	parters	28357832
+37	16301	eschew	5987435
+37	16302	quitter	28357832
+37	16303	neat	39654943
+37	18001	jarring	5987435
+37	18002	tinily	28357832
+37	18003	balled	39654943
+37	18012	impulsive	28357832
+37	18013	starlet	39654943
+37	18021	lawgiver	5987435
+37	18022	stated	28357832
+37	18023	readable	39654943
+37	18032	testicle	28357832
+37	18033	Parsifal	39654943
+37	18041	Punjab	5987435
+37	18042	Merritt	28357832
+37	18043	Quixotism	39654943
+37	18051	sureties	5987435
+37	18052	puddings	28357832
+37	18053	tapestry	39654943
+37	18061	trimmings	5987435
+37	18062	humility	28357832
+37	18101	tragedies	5987435
+37	18102	skulking	28357832
+37	18103	flint	39654943
+37	18201	relaxing	5987435
+37	18202	offload	28357832
+37	18402	suites	28357832
+37	18403	lists	39654943
+37	18601	vacuuming	5987435
+37	18602	dentally	28357832
+37	18603	humanness	39654943
+37	18801	inch	5987435
+37	18802	Weissmuller	28357832
+37	18803	irresponsibly	39654943
+37	18811	repetitions	5987435
+37	18812	Antares	28357832
+37	19101	ventilate	5987435
+37	19102	pityingly	28357832
+37	19103	interdependent	39654943
+37	19201	Graves	5987435
+37	30501	neonatal	5987435
+37	30502	scribbled	28357832
+37	30503	chafe	39654943
+37	31901	realtor	5987435
+37	36001	elite	5987435
+37	36002	funereal	28357832
+37	38001	Conley	5987435
+37	38002	lectured	28357832
+37	38003	Abraham	39654943
+37	38011	groupings	5987435
+37	38012	dissociate	28357832
+37	38013	coexist	39654943
+37	38101	rusting	5987435
+37	38102	galling	28357832
+37	38103	obliterates	39654943
+37	38201	resumes	5987435
+37	38202	analyzable	28357832
+37	38203	terminator	39654943
+select sum(price) from t3,t2 where t2.fld1 = t3.t2nr and t3.companynr = 512 and t3.t2nr = 38008 and t2.fld1 = 38008 or t2.fld1= t3.t2nr and t3.t2nr = 38008 and t2.fld1 = 38008;
+sum(price)
+234298
+select t2.fld1,sum(price) from t3,t2 where t2.fld1 = t3.t2nr and t3.companynr = 512 and t3.t2nr = 38008 and t2.fld1 = 38008 or t2.fld1 = t3.t2nr and t3.t2nr = 38008 and t2.fld1 = 38008 or t3.t2nr = t2.fld1 and t2.fld1 = 38008 group by t2.fld1;
+fld1	sum(price)
+038008	234298
+explain select fld3 from t2 where 1>2 or 2>3;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE
+explain select fld3 from t2 where fld1=fld1;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	1199	
+select companynr,fld1 from t2 HAVING fld1=250501 or fld1=250502;
+companynr	fld1
+34	250501
+34	250502
+select companynr,fld1 from t2 WHERE fld1>=250501 HAVING fld1<=250502;
+companynr	fld1
+34	250501
+34	250502
+select companynr,count(*) as count,sum(fld1) as sum from t2 group by companynr having count > 40 and sum/count >= 120000;
+companynr	count	sum
+00	82	10355753
+29	95	14473298
+34	70	17788966
+37	588	83602098
+41	52	12816335
+select companynr from t2 group by companynr having count(*) > 40 and sum(fld1)/count(*) >= 120000 ;
+companynr
+00
+29
+34
+37
+41
+select t2.companynr,companyname,count(*) from t2,t4 where t2.companynr=t4.companynr group by companyname having t2.companynr >= 40;
+companynr	companyname	count(*)
+68	company 10	12
+50	company 11	11
+40	company 5	37
+41	company 6	52
+53	company 7	4
+58	company 8	23
+65	company 9	10
+select count(*) from t2;
+count(*)
+1199
+select count(*) from t2 where fld1 < 098024;
+count(*)
+387
+select min(fld1) from t2 where fld1>= 098024;
+min(fld1)
+98024
+select max(fld1) from t2 where fld1>= 098024;
+max(fld1)
+1232609
+select count(*) from t3 where price2=76234234;
+count(*)
+4181
+select count(*) from t3 where companynr=512 and price2=76234234;
+count(*)
+4181
+explain select min(fld1),max(fld1),count(*) from t2;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Select tables optimized away
+select min(fld1),max(fld1),count(*) from t2;
+min(fld1)	max(fld1)	count(*)
+0	1232609	1199
+select min(t2nr),max(t2nr) from t3 where t2nr=2115 and price2=823742;
+min(t2nr)	max(t2nr)
+2115	2115
+select count(*),min(t2nr),max(t2nr) from t3 where name='spates' and companynr=78;
+count(*)	min(t2nr)	max(t2nr)
+4181	4	41804
+select t2nr,count(*) from t3 where name='gems' group by t2nr limit 20;
+t2nr	count(*)
+9	1
+19	1
+29	1
+39	1
+49	1
+59	1
+69	1
+79	1
+89	1
+99	1
+109	1
+119	1
+129	1
+139	1
+149	1
+159	1
+169	1
+179	1
+189	1
+199	1
+select max(t2nr) from t3 where price=983543950;
+max(t2nr)
+41807
+select t1.period from t3 = t1 limit 1;
+period
+1001
+select t1.period from t1 as t1 limit 1;
+period
+9410
+select t1.period as "Nuvarande period" from t1 as t1 limit 1;
+Nuvarande period
+9410
+select period as ok_period from t1 limit 1;
+ok_period
+9410
+select period as ok_period from t1 group by ok_period limit 1;
+ok_period
+9410
+select 1+1 as summa from t1 group by summa limit 1;
+summa
+2
+select period as "Nuvarande period" from t1 group by "Nuvarande period" limit 1;
+Nuvarande period
+9410
+show tables;
+Tables_in_test
+t1
+t2
+t3
+t4
+show tables from test like "s%";
+Tables_in_test (s%)
+show tables from test like "t?";
+Tables_in_test (t?)
+show full columns from t2;
+Field	Type	Collation	Null	Key	Default	Extra	Privileges	Comment
+auto	int(11)	NULL	NO	PRI	NULL	auto_increment	#	
+fld1	int(6) unsigned zerofill	NULL	NO	UNI	000000		#	
+companynr	tinyint(2) unsigned zerofill	NULL	NO		00		#	
+fld3	char(30)	latin1_swedish_ci	NO	MUL			#	
+fld4	char(35)	latin1_swedish_ci	NO				#	
+fld5	char(35)	latin1_swedish_ci	NO				#	
+fld6	char(4)	latin1_swedish_ci	NO				#	
+show full columns from t2 from test like 'f%';
+Field	Type	Collation	Null	Key	Default	Extra	Privileges	Comment
+fld1	int(6) unsigned zerofill	NULL	NO	UNI	000000		#	
+fld3	char(30)	latin1_swedish_ci	NO	MUL			#	
+fld4	char(35)	latin1_swedish_ci	NO				#	
+fld5	char(35)	latin1_swedish_ci	NO				#	
+fld6	char(4)	latin1_swedish_ci	NO				#	
+show full columns from t2 from test like 's%';
+Field	Type	Collation	Null	Key	Default	Extra	Privileges	Comment
+show keys from t2;
+Table	Non_unique	Key_name	Seq_in_index	Column_name	Collation	Cardinality	Sub_part	Packed	Null	Index_type	Comment
+t2	0	PRIMARY	1	auto	A	1199	NULL	NULL		BTREE	
+t2	0	fld1	1	fld1	A	1199	NULL	NULL		BTREE	
+t2	1	fld3	1	fld3	A	NULL	NULL	NULL		BTREE	
+drop table t4, t3, t2, t1;
+DO 1;
+DO benchmark(100,1+1),1,1;
+do default;
+ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '' at line 1
+do foobar;
+ERROR 42S22: Unknown column 'foobar' in 'field list'
+CREATE TABLE t1 (
+id mediumint(8) unsigned NOT NULL auto_increment,
+pseudo varchar(35) NOT NULL default '',
+PRIMARY KEY  (id),
+UNIQUE KEY pseudo (pseudo)
+);
+INSERT INTO t1 (pseudo) VALUES ('test');
+INSERT INTO t1 (pseudo) VALUES ('test1');
+SELECT 1 as rnd1 from t1 where rand() > 2;
+rnd1
+DROP TABLE t1;
+CREATE TABLE t1 (gvid int(10) unsigned default NULL,  hmid int(10) unsigned default NULL,  volid int(10) unsigned default NULL,  mmid int(10) unsigned default NULL,  hdid int(10) unsigned default NULL,  fsid int(10) unsigned default NULL,  ctid int(10) unsigned default NULL,  dtid int(10) unsigned default NULL,  cost int(10) unsigned default NULL,  performance int(10) unsigned default NULL,  serialnumber bigint(20) unsigned default NULL,  monitored tinyint(3) unsigned default '1',  removed tinyint(3) unsigned default '0',  target tinyint(3) unsigned default '0',  dt_modified timestamp NOT NULL,  name varchar(255) binary default NULL,  description varchar(255) default NULL,  UNIQUE KEY hmid (hmid,volid)) ENGINE=MyISAM;
+INSERT INTO t1 VALUES (200001,2,1,1,100,1,1,1,0,0,0,1,0,1,20020425060057,'\\\\ARKIVIO-TESTPDC\\E$',''),(200002,2,2,1,101,1,1,1,0,0,0,1,0,1,20020425060057,'\\\\ARKIVIO-TESTPDC\\C$',''),(200003,1,3,2,NULL,NULL,NULL,NULL,NULL,NULL,NULL,1,0,1,20020425060427,'c:',NULL);
+CREATE TABLE t2 (  hmid int(10) unsigned default NULL,  volid int(10) unsigned default NULL,  sampletid smallint(5) unsigned default NULL,  sampletime datetime default NULL,  samplevalue bigint(20) unsigned default NULL,  KEY idx1 (hmid,volid,sampletid,sampletime)) ENGINE=MyISAM;
+INSERT INTO t2 VALUES (1,3,10,'2002-06-01 08:00:00',35),(1,3,1010,'2002-06-01 12:00:01',35);
+SELECT a.gvid, (SUM(CASE b.sampletid WHEN 140 THEN b.samplevalue ELSE 0 END)) as the_success,(SUM(CASE b.sampletid WHEN 141 THEN b.samplevalue ELSE 0 END)) as the_fail,(SUM(CASE b.sampletid WHEN 142 THEN b.samplevalue ELSE 0 END)) as the_size,(SUM(CASE b.sampletid WHEN 143 THEN b.samplevalue ELSE 0 END)) as the_time FROM t1 a, t2 b WHERE a.hmid = b.hmid AND a.volid = b.volid AND b.sampletime >= 'wrong-date-value' AND b.sampletime < 'wrong-date-value' AND b.sampletid IN (140, 141, 142, 143) GROUP BY a.gvid;
+gvid	the_success	the_fail	the_size	the_time
+Warnings:
+Warning	1292	Incorrect datetime value: 'wrong-date-value' for column 'sampletime' at row 1
+Warning	1292	Incorrect datetime value: 'wrong-date-value' for column 'sampletime' at row 1
+SELECT a.gvid, (SUM(CASE b.sampletid WHEN 140 THEN b.samplevalue ELSE 0 END)) as the_success,(SUM(CASE b.sampletid WHEN 141 THEN b.samplevalue ELSE 0 END)) as the_fail,(SUM(CASE b.sampletid WHEN 142 THEN b.samplevalue ELSE 0 END)) as the_size,(SUM(CASE b.sampletid WHEN 143 THEN b.samplevalue ELSE 0 END)) as the_time FROM t1 a, t2 b WHERE a.hmid = b.hmid AND a.volid = b.volid AND b.sampletime >= NULL AND b.sampletime < NULL AND b.sampletid IN (140, 141, 142, 143) GROUP BY a.gvid;
+gvid	the_success	the_fail	the_size	the_time
+DROP TABLE t1,t2;
+create table  t1 (  A_Id bigint(20) NOT NULL default '0',  A_UpdateBy char(10) NOT NULL default '',  A_UpdateDate bigint(20) NOT NULL default '0',  A_UpdateSerial int(11) NOT NULL default '0',  other_types bigint(20) NOT NULL default '0',  wss_type bigint(20) NOT NULL default '0');
+INSERT INTO t1 VALUES (102935998719055004,'brade',1029359987,2,102935229116544068,102935229216544093);
+select wss_type from t1 where wss_type ='102935229216544106';
+wss_type
+select wss_type from t1 where wss_type ='102935229216544105';
+wss_type
+select wss_type from t1 where wss_type ='102935229216544104';
+wss_type
+select wss_type from t1 where wss_type ='102935229216544093';
+wss_type
+102935229216544093
+select wss_type from t1 where wss_type =102935229216544093;
+wss_type
+102935229216544093
+drop table t1;
+select 1+2,"aaaa",3.13*2.0 into @a,@b,@c;
+select @a;
+@a
+3
+select @b;
+@b
+aaaa
+select @c;
+@c
+6.260
+create table t1 (a int not null auto_increment primary key);
+insert into t1 values ();
+insert into t1 values ();
+insert into t1 values ();
+select * from (t1 as t2 left join t1 as t3 using (a)), t1;
+a	a
+1	1
+2	1
+3	1
+1	2
+2	2
+3	2
+1	3
+2	3
+3	3
+select * from t1, (t1 as t2 left join t1 as t3 using (a));
+a	a
+1	1
+2	1
+3	1
+1	2
+2	2
+3	2
+1	3
+2	3
+3	3
+select * from (t1 as t2 left join t1 as t3 using (a)) straight_join t1;
+a	a
+1	1
+2	1
+3	1
+1	2
+2	2
+3	2
+1	3
+2	3
+3	3
+select * from t1 straight_join (t1 as t2 left join t1 as t3 using (a));
+a	a
+1	1
+2	1
+3	1
+1	2
+2	2
+3	2
+1	3
+2	3
+3	3
+select * from (t1 as t2 left join t1 as t3 using (a)) inner join t1 on t1.a>1;
+a	a
+1	2
+2	2
+3	2
+1	3
+2	3
+3	3
+select * from t1 inner join (t1 as t2 left join t1 as t3 using (a)) on t1.a>1;
+a	a
+2	1
+3	1
+2	2
+3	2
+2	3
+3	3
+select * from (t1 as t2 left join t1 as t3 using (a)) inner join t1 using ( a );
+a
+1
+2
+3
+select * from t1 inner join (t1 as t2 left join t1 as t3 using (a)) using ( a );
+a
+1
+2
+3
+select * from (t1 as t2 left join t1 as t3 using (a)) left outer join t1 on t1.a>1;
+a	a
+1	2
+2	2
+3	2
+1	3
+2	3
+3	3
+select * from t1 left outer join (t1 as t2 left join t1 as t3 using (a)) on t1.a>1;
+a	a
+2	1
+3	1
+2	2
+3	2
+2	3
+3	3
+1	NULL
+select * from (t1 as t2 left join t1 as t3 using (a)) left join t1 using ( a );
+a
+1
+2
+3
+select * from t1 left join (t1 as t2 left join t1 as t3 using (a)) using ( a );
+a
+1
+2
+3
+select * from (t1 as t2 left join t1 as t3 using (a)) natural left join t1;
+a
+1
+2
+3
+select * from t1 natural left join (t1 as t2 left join t1 as t3 using (a));
+a
+1
+2
+3
+select * from (t1 as t2 left join t1 as t3 using (a)) right join t1 on t1.a>1;
+a	a
+1	2
+1	3
+2	2
+2	3
+3	2
+3	3
+NULL	1
+select * from t1 right join (t1 as t2 left join t1 as t3 using (a)) on t1.a>1;
+a	a
+2	1
+2	2
+2	3
+3	1
+3	2
+3	3
+select * from (t1 as t2 left join t1 as t3 using (a)) right outer join t1 using ( a );
+a
+1
+2
+3
+select * from t1 right outer join (t1 as t2 left join t1 as t3 using (a)) using ( a );
+a
+1
+2
+3
+select * from (t1 as t2 left join t1 as t3 using (a)) natural right join t1;
+a
+1
+2
+3
+select * from t1 natural right join (t1 as t2 left join t1 as t3 using (a));
+a
+1
+2
+3
+select * from t1 natural join (t1 as t2 left join t1 as t3 using (a));
+a
+1
+2
+3
+select * from (t1 as t2 left join t1 as t3 using (a)) natural join t1;
+a
+1
+2
+3
+drop table t1;
+CREATE TABLE t1 (  aa char(2),  id int(11) NOT NULL auto_increment,  t2_id int(11) NOT NULL default '0',  PRIMARY KEY  (id),  KEY replace_id (t2_id)) ENGINE=MyISAM;
+INSERT INTO t1 VALUES ("1",8264,2506),("2",8299,2517),("3",8301,2518),("4",8302,2519),("5",8303,2520),("6",8304,2521),("7",8305,2522);
+CREATE TABLE t2 ( id int(11) NOT NULL auto_increment,  PRIMARY KEY  (id)) ENGINE=MyISAM;
+INSERT INTO t2 VALUES (2517), (2518), (2519), (2520), (2521), (2522);
+select * from t1, t2 WHERE t1.t2_id = t2.id and t1.t2_id > 0   order by t1.id   LIMIT 0, 5;
+aa	id	t2_id	id
+2	8299	2517	2517
+3	8301	2518	2518
+4	8302	2519	2519
+5	8303	2520	2520
+6	8304	2521	2521
+drop table t1,t2;
+create table t1 (id1 int NOT NULL);
+create table t2 (id2 int NOT NULL);
+create table t3 (id3 int NOT NULL);
+create table t4 (id4 int NOT NULL, id44 int NOT NULL, KEY (id4));
+insert into t1 values (1);
+insert into t1 values (2);
+insert into t2 values (1);
+insert into t4 values (1,1);
+explain select * from t1 left join t2 on id1 = id2 left join t3 on id1 = id3
+left join t4 on id3 = id4 where id2 = 1 or id4 = 1;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t3	system	NULL	NULL	NULL	NULL	0	const row not found
+1	SIMPLE	t4	const	id4	NULL	NULL	NULL	1	
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	2	
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	1	Using where; Using join buffer
+select * from t1 left join t2 on id1 = id2 left join t3 on id1 = id3
+left join t4 on id3 = id4 where id2 = 1 or id4 = 1;
+id1	id2	id3	id4	id44
+1	1	NULL	NULL	NULL
+drop table t1,t2,t3,t4;
+create table t1(s varchar(10) not null);
+create table t2(s varchar(10) not null primary key);
+create table t3(s varchar(10) not null primary key);
+insert into t1 values ('one\t'), ('two\t');
+insert into t2 values ('one\r'), ('two\t');
+insert into t3 values ('one '), ('two\t');
+select * from t1 where s = 'one';
+s
+select * from t2 where s = 'one';
+s
+select * from t3 where s = 'one';
+s
+one 
+select * from t1,t2 where t1.s = t2.s;
+s	s
+two		two	
+select * from t2,t3 where t2.s = t3.s;
+s	s
+two		two	
+drop table t1, t2, t3;
+create table t1 (a integer,  b integer, index(a), index(b));
+create table t2 (c integer,  d integer, index(c), index(d));
+insert into t1 values (1,2), (2,2), (3,2), (4,2);
+insert into t2 values (1,3), (2,3), (3,4), (4,4);
+explain select * from t1 left join t2 on a=c where d in (4);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t2	ref	c,d	d	5	const	2	
+1	SIMPLE	t1	ALL	a	NULL	NULL	NULL	4	Using where; Using join buffer
+select * from t1 left join t2 on a=c where d in (4);
+a	b	c	d
+3	2	3	4
+4	2	4	4
+explain select * from t1 left join t2 on a=c where d = 4;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t2	ref	c,d	d	5	const	2	
+1	SIMPLE	t1	ALL	a	NULL	NULL	NULL	4	Using where; Using join buffer
+select * from t1 left join t2 on a=c where d = 4;
+a	b	c	d
+3	2	3	4
+4	2	4	4
+drop table t1, t2;
+CREATE TABLE t1 (
+i int(11) NOT NULL default '0',
+c char(10) NOT NULL default '',
+PRIMARY KEY  (i),
+UNIQUE KEY c (c)
+) ENGINE=MyISAM;
+INSERT INTO t1 VALUES (1,'a');
+INSERT INTO t1 VALUES (2,'b');
+INSERT INTO t1 VALUES (3,'c');
+EXPLAIN SELECT i FROM t1 WHERE i=1;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	const	PRIMARY	PRIMARY	4	const	1	Using index
+DROP TABLE t1;
+CREATE TABLE t1 ( a BLOB, INDEX (a(20)) );
+CREATE TABLE t2 ( a BLOB, INDEX (a(20)) );
+INSERT INTO t1 VALUES ('one'),('two'),('three'),('four'),('five');
+INSERT INTO t2 VALUES ('one'),('two'),('three'),('four'),('five');
+EXPLAIN SELECT * FROM t1 LEFT JOIN t2 USE INDEX (a) ON t1.a=t2.a;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	5	
+1	SIMPLE	t2	ref	a	a	23	test.t1.a	2	Using where
+EXPLAIN SELECT * FROM t1 LEFT JOIN t2 FORCE INDEX (a) ON t1.a=t2.a;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	5	
+1	SIMPLE	t2	ref	a	a	23	test.t1.a	2	Using where
+DROP TABLE t1, t2;
+CREATE TABLE t1 ( city char(30) );
+INSERT INTO t1 VALUES ('London');
+INSERT INTO t1 VALUES ('Paris');
+SELECT * FROM t1 WHERE city='London';
+city
+London
+SELECT * FROM t1 WHERE city='london';
+city
+London
+EXPLAIN SELECT * FROM t1 WHERE city='London' AND city='london';
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	2	Using where
+SELECT * FROM t1 WHERE city='London' AND city='london';
+city
+London
+EXPLAIN SELECT * FROM t1 WHERE city LIKE '%london%' AND city='London';
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	2	Using where
+SELECT * FROM t1 WHERE city LIKE '%london%' AND city='London';
+city
+London
+DROP TABLE t1;
+create table t1 (a int(11) unsigned, b int(11) unsigned);
+insert into t1 values (1,0), (1,1), (1,2);
+select a-b  from t1 order by 1;
+a-b
+0
+1
+18446744073709551615
+select a-b , (a-b < 0)  from t1 order by 1;
+a-b	(a-b < 0)
+0	0
+1	0
+18446744073709551615	0
+select a-b as d, (a-b >= 0), b from t1 group by b having d >= 0;
+d	(a-b >= 0)	b
+1	1	0
+0	1	1
+18446744073709551615	1	2
+select cast((a - b) as unsigned) from t1 order by 1;
+cast((a - b) as unsigned)
+0
+1
+18446744073709551615
+drop table t1;
+create table t1 (a int(11));
+select all all * from t1;
+a
+select distinct distinct * from t1;
+a
+select all distinct * from t1;
+ERROR HY000: Incorrect usage of ALL and DISTINCT
+select distinct all * from t1;
+ERROR HY000: Incorrect usage of ALL and DISTINCT
+drop table t1;
+CREATE TABLE t1 (
+kunde_intern_id int(10) unsigned NOT NULL default '0',
+kunde_id int(10) unsigned NOT NULL default '0',
+FK_firma_id int(10) unsigned NOT NULL default '0',
+aktuell enum('Ja','Nein') NOT NULL default 'Ja',
+vorname varchar(128) NOT NULL default '',
+nachname varchar(128) NOT NULL default '',
+geloescht enum('Ja','Nein') NOT NULL default 'Nein',
+firma varchar(128) NOT NULL default ''
+);
+INSERT INTO t1 VALUES 
+(3964,3051,1,'Ja','Vorname1','1Nachname','Nein','Print Schau XXXX'),
+(3965,3051111,1,'Ja','Vorname1111','1111Nachname','Nein','Print Schau XXXX');
+SELECT kunde_id ,FK_firma_id ,aktuell, vorname, nachname, geloescht FROM t1
+WHERE
+(
+(
+( '' != '' AND firma LIKE CONCAT('%', '', '%'))
+OR
+(vorname LIKE CONCAT('%', 'Vorname1', '%') AND 
+nachname LIKE CONCAT('%', '1Nachname', '%') AND 
+'Vorname1' != '' AND 'xxxx' != '')
+)
+AND
+(
+aktuell = 'Ja' AND geloescht = 'Nein' AND FK_firma_id = 2
+)
+)
+;
+kunde_id	FK_firma_id	aktuell	vorname	nachname	geloescht
+SELECT kunde_id ,FK_firma_id ,aktuell, vorname, nachname,
+geloescht FROM t1
+WHERE
+(
+(
+aktuell = 'Ja' AND geloescht = 'Nein' AND FK_firma_id = 2
+)
+AND
+(
+( '' != '' AND firma LIKE CONCAT('%', '', '%')  )
+OR
+(  vorname LIKE CONCAT('%', 'Vorname1', '%') AND
+nachname LIKE CONCAT('%', '1Nachname', '%') AND 'Vorname1' != '' AND
+'xxxx' != '')
+)
+)
+;
+kunde_id	FK_firma_id	aktuell	vorname	nachname	geloescht
+SELECT COUNT(*) FROM t1 WHERE 
+( 0 OR (vorname LIKE '%Vorname1%' AND nachname LIKE '%1Nachname%' AND 1)) 
+AND FK_firma_id = 2;
+COUNT(*)
+0
+drop table t1;
+CREATE TABLE t1 (b BIGINT(20) UNSIGNED NOT NULL, PRIMARY KEY (b));
+INSERT INTO t1 VALUES (0x8000000000000000);
+SELECT b FROM t1 WHERE b=0x8000000000000000;
+b
+9223372036854775808
+DROP TABLE t1;
+CREATE TABLE `t1` ( `gid` int(11) default NULL, `uid` int(11) default NULL);
+CREATE TABLE `t2` ( `ident` int(11) default NULL, `level` char(16) default NULL);
+INSERT INTO `t2` VALUES (0,'READ');
+CREATE TABLE `t3` ( `id` int(11) default NULL, `name` char(16) default NULL);
+INSERT INTO `t3` VALUES (1,'fs');
+select * from t3 left join t1 on t3.id = t1.uid, t2 where t2.ident in (0, t1.gid, t3.id, 0);
+id	name	gid	uid	ident	level
+1	fs	NULL	NULL	0	READ
+drop table t1,t2,t3;
+CREATE TABLE t1 (
+acct_id int(11) NOT NULL default '0',
+profile_id smallint(6) default NULL,
+UNIQUE KEY t1$acct_id (acct_id),
+KEY t1$profile_id (profile_id)
+);
+INSERT INTO t1 VALUES (132,17),(133,18);
+CREATE TABLE t2 (
+profile_id smallint(6) default NULL,
+queue_id int(11) default NULL,
+seq int(11) default NULL,
+KEY t2$queue_id (queue_id)
+);
+INSERT INTO t2 VALUES (17,31,4),(17,30,3),(17,36,2),(17,37,1);
+CREATE TABLE t3 (
+id int(11) NOT NULL default '0',
+qtype int(11) default NULL,
+seq int(11) default NULL,
+warn_lvl int(11) default NULL,
+crit_lvl int(11) default NULL,
+rr1 tinyint(4) NOT NULL default '0',
+rr2 int(11) default NULL,
+default_queue tinyint(4) NOT NULL default '0',
+KEY t3$qtype (qtype),
+KEY t3$id (id)
+);
+INSERT INTO t3 VALUES (30,1,29,NULL,NULL,0,NULL,0),(31,1,28,NULL,NULL,0,NULL,0),
+(36,1,34,NULL,NULL,0,NULL,0),(37,1,35,NULL,NULL,0,121,0);
+SELECT COUNT(*) FROM t1 a STRAIGHT_JOIN t2 pq STRAIGHT_JOIN t3 q 
+WHERE 
+(pq.profile_id = a.profile_id) AND (a.acct_id = 132) AND 
+(pq.queue_id = q.id) AND (q.rr1 <> 1);
+COUNT(*)
+4
+drop table t1,t2,t3;
+create table t1 (f1 int);
+insert into t1 values (1),(NULL);
+create table t2 (f2 int, f3 int, f4 int);
+create index idx1 on t2 (f4);
+insert into t2 values (1,2,3),(2,4,6);
+select A.f2 from t1 left join t2 A on A.f2 = f1 where A.f3=(select min(f3)
+from  t2 C where A.f4 = C.f4) or A.f3 IS NULL;
+f2
+1
+NULL
+drop table t1,t2;
+create table t2 (a tinyint unsigned);
+create index t2i on t2(a);
+insert into t2 values (0), (254), (255);
+explain select * from t2 where a > -1;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t2	index	t2i	t2i	2	NULL	3	Using where; Using index
+select * from t2 where a > -1;
+a
+0
+254
+255
+drop table t2;
+CREATE TABLE t1 (a int, b int, c int);
+INSERT INTO t1
+SELECT 50, 3, 3 FROM DUAL
+WHERE NOT EXISTS
+(SELECT * FROM t1 WHERE a = 50 AND b = 3);
+SELECT * FROM t1;
+a	b	c
+50	3	3
+INSERT INTO t1
+SELECT 50, 3, 3 FROM DUAL
+WHERE NOT EXISTS
+(SELECT * FROM t1 WHERE a = 50 AND b = 3);
+select found_rows();
+found_rows()
+0
+SELECT * FROM t1;
+a	b	c
+50	3	3
+select count(*) from t1;
+count(*)
+1
+select found_rows();
+found_rows()
+1
+select count(*) from t1 limit 2,3;
+count(*)
+select found_rows();
+found_rows()
+0
+select SQL_CALC_FOUND_ROWS count(*) from t1 limit 2,3;
+count(*)
+select found_rows();
+found_rows()
+1
+DROP TABLE t1;
+CREATE TABLE t1 (a INT, b INT);
+(SELECT a, b AS c FROM t1) ORDER BY c+1;
+a	c
+(SELECT a, b AS c FROM t1) ORDER BY b+1;
+a	c
+SELECT a, b AS c FROM t1 ORDER BY c+1;
+a	c
+SELECT a, b AS c FROM t1 ORDER BY b+1;
+a	c
+drop table t1;
+create table t1(f1 int, f2 int);
+create table t2(f3 int);
+select f1 from t1,t2 where f1=f2 and (f1,f2) = ((1,1));
+f1
+select f1 from t1,t2 where f1=f2 and (f1,NULL) = ((1,1));
+f1
+select f1 from t1,t2 where f1=f2 and (f1,f2) = ((1,NULL));
+f1
+insert into t1 values(1,1),(2,null);
+insert into t2 values(2);
+select * from t1,t2 where f1=f3 and (f1,f2) = (2,null);
+f1	f2	f3
+select * from t1,t2 where f1=f3 and (f1,f2) <=> (2,null);
+f1	f2	f3
+2	NULL	2
+drop table t1,t2;
+create table t1 (f1 int not null auto_increment primary key, f2 varchar(10));
+create table t11 like t1;
+insert into t1 values(1,""),(2,"");
+show table status like 't1%';
+Name	Engine	Version	Row_format	Rows	Avg_row_length	Data_length	Max_data_length	Index_length	Data_free	Auto_increment	Create_time	Update_time	Check_time	Collation	Checksum	Create_options	Comment
+t1	MyISAM	10	Dynamic	2	20	X	X	X	X	X	X	X	X	latin1_swedish_ci	NULL		
+t11	MyISAM	10	Dynamic	0	0	X	X	X	X	X	X	X	X	latin1_swedish_ci	NULL		
+select 123 as a from t1 where f1 is null;
+a
+drop table t1,t11;
+CREATE TABLE t1 ( a INT NOT NULL, b INT NOT NULL, UNIQUE idx (a,b) );
+INSERT INTO t1 VALUES (1,1),(1,2),(1,3),(1,4);
+CREATE TABLE t2 ( a INT NOT NULL, b INT NOT NULL, e INT );
+INSERT INTO t2 VALUES ( 1,10,1), (1,10,2), (1,11,1), (1,11,2), (1,2,1), (1,2,2),(1,2,3);
+SELECT t2.a, t2.b, IF(t1.b IS NULL,'',e) AS c, COUNT(*) AS d FROM t2 LEFT JOIN
+t1 ON t2.a = t1.a AND t2.b = t1.b GROUP BY a, b, c;
+a	b	c	d
+1	2	1	1
+1	2	2	1
+1	2	3	1
+1	10		2
+1	11		2
+SELECT t2.a, t2.b, IF(t1.b IS NULL,'',e) AS c, COUNT(*) AS d FROM t2 LEFT JOIN
+t1 ON t2.a = t1.a AND t2.b = t1.b GROUP BY t1.a, t1.b, c;
+a	b	c	d
+1	10		4
+1	2	1	1
+1	2	2	1
+1	2	3	1
+SELECT t2.a, t2.b, IF(t1.b IS NULL,'',e) AS c, COUNT(*) AS d FROM t2 LEFT JOIN
+t1 ON t2.a = t1.a AND t2.b = t1.b GROUP BY t2.a, t2.b, c;
+a	b	c	d
+1	2	1	1
+1	2	2	1
+1	2	3	1
+1	10		2
+1	11		2
+SELECT t2.a, t2.b, IF(t1.b IS NULL,'',e) AS c, COUNT(*) AS d FROM t2,t1
+WHERE t2.a = t1.a AND t2.b = t1.b GROUP BY a, b, c;
+a	b	c	d
+1	2	1	1
+1	2	2	1
+1	2	3	1
+DROP TABLE IF EXISTS t1, t2;
+create table t1 (f1 int primary key, f2 int);
+create table t2 (f3 int, f4 int, primary key(f3,f4));
+insert into t1 values (1,1);
+insert into t2 values (1,1),(1,2);
+select distinct count(f2) >0 from t1 left join t2 on f1=f3 group by f1;
+count(f2) >0
+1
+drop table t1,t2;
+create table t1 (f1 int,f2 int);
+insert into t1 values(1,1);
+create table t2 (f3 int, f4 int, primary key(f3,f4));
+insert into t2 values(1,1);
+select * from t1 where f1 in (select f3 from t2 where (f3,f4)= (select f3,f4 from t2));
+f1	f2
+1	1
+drop table t1,t2;
+CREATE TABLE t1(a int, b int, c int, KEY b(b), KEY c(c));
+insert into t1 values (1,0,0),(2,0,0);
+CREATE TABLE t2 (a int, b varchar(2), c varchar(2), PRIMARY KEY(a));
+insert into t2 values (1,'',''), (2,'','');
+CREATE TABLE t3 (a int, b int, PRIMARY KEY (a,b), KEY a (a), KEY b (b));
+insert into t3 values (1,1),(1,2);
+explain select straight_join DISTINCT t2.a,t2.b, t1.c from t1, t3, t2 
+where (t1.c=t2.a or (t1.c=t3.a and t2.a=t3.b)) and t1.b=556476786 and 
+t2.b like '%%' order by t2.b limit 0,1;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	ref	b,c	b	5	const	1	Using temporary; Using filesort
+1	SIMPLE	t3	index	PRIMARY,a,b	PRIMARY	8	NULL	2	Using index; Using join buffer
+1	SIMPLE	t2	ALL	PRIMARY	NULL	NULL	NULL	2	Range checked for each record (index map: 0x1)
+DROP TABLE t1,t2,t3;
+CREATE TABLE t1 (a int, INDEX idx(a));
+INSERT INTO t1 VALUES (2), (3), (1);
+EXPLAIN SELECT * FROM t1 IGNORE INDEX (idx);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	
+EXPLAIN SELECT * FROM t1 IGNORE INDEX (a);
+ERROR 42000: Key 'a' doesn't exist in table 't1'
+EXPLAIN SELECT * FROM t1 FORCE INDEX (a);
+ERROR 42000: Key 'a' doesn't exist in table 't1'
+DROP TABLE t1;
+CREATE TABLE t1 (a int, b int);
+INSERT INTO t1 VALUES (1,1), (2,1), (4,10);
+CREATE TABLE t2 (a int PRIMARY KEY, b int, KEY b (b));
+INSERT INTO t2 VALUES (1,NULL), (2,10);
+ALTER TABLE t1 ENABLE KEYS;
+EXPLAIN SELECT STRAIGHT_JOIN SQL_NO_CACHE COUNT(*) FROM t2, t1 WHERE t1.b = t2.b OR t2.b IS NULL;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t2	index	b	b	5	NULL	2	Using index
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	Using where; Using join buffer
+SELECT STRAIGHT_JOIN SQL_NO_CACHE * FROM t2, t1 WHERE t1.b = t2.b OR t2.b IS NULL;
+a	b	a	b
+1	NULL	1	1
+1	NULL	2	1
+1	NULL	4	10
+2	10	4	10
+EXPLAIN SELECT STRAIGHT_JOIN SQL_NO_CACHE COUNT(*) FROM t2, t1 WHERE t1.b = t2.b OR t2.b IS NULL;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t2	index	b	b	5	NULL	2	Using index
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	Using where; Using join buffer
+SELECT STRAIGHT_JOIN SQL_NO_CACHE * FROM t2, t1 WHERE t1.b = t2.b OR t2.b IS NULL;
+a	b	a	b
+1	NULL	1	1
+1	NULL	2	1
+1	NULL	4	10
+2	10	4	10
+DROP TABLE IF EXISTS t1,t2;
+CREATE TABLE t1 (key1 float default NULL, UNIQUE KEY key1 (key1));
+CREATE TABLE t2 (key2 float default NULL, UNIQUE KEY key2 (key2));
+INSERT INTO t1 VALUES (0.3762),(0.3845),(0.6158),(0.7941);
+INSERT INTO t2 VALUES (1.3762),(1.3845),(1.6158),(1.7941);
+explain select max(key1) from t1 where key1 <= 0.6158;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Select tables optimized away
+explain select max(key2) from t2 where key2 <= 1.6158;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Select tables optimized away
+explain select min(key1) from t1 where key1 >= 0.3762;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Select tables optimized away
+explain select min(key2) from t2 where key2 >= 1.3762;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Select tables optimized away
+explain select max(key1), min(key2) from t1, t2
+where key1 <= 0.6158 and key2 >= 1.3762;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Select tables optimized away
+explain select max(key1) from t1 where key1 <= 0.6158 and rand() + 0.5 >= 0.5;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Select tables optimized away
+explain select min(key1) from t1 where key1 >= 0.3762 and rand() + 0.5 >= 0.5;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Select tables optimized away
+select max(key1) from t1 where key1 <= 0.6158;
+max(key1)
+0.615800023078918
+select max(key2) from t2 where key2 <= 1.6158;
+max(key2)
+1.61580002307892
+select min(key1) from t1 where key1 >= 0.3762;
+min(key1)
+0.376199990510941
+select min(key2) from t2 where key2 >= 1.3762;
+min(key2)
+1.37619996070862
+select max(key1), min(key2) from t1, t2
+where key1 <= 0.6158 and key2 >= 1.3762;
+max(key1)	min(key2)
+0.615800023078918	1.37619996070862
+select max(key1) from t1 where key1 <= 0.6158 and rand() + 0.5 >= 0.5;
+max(key1)
+0.615800023078918
+select min(key1) from t1 where key1 >= 0.3762 and rand() + 0.5 >= 0.5;
+min(key1)
+0.376199990510941
+DROP TABLE t1,t2;
+CREATE TABLE t1 (i BIGINT UNSIGNED NOT NULL);
+INSERT INTO t1 VALUES (10);
+SELECT i='1e+01',i=1e+01, i in (1e+01,1e+01), i in ('1e+01','1e+01') FROM t1;
+i='1e+01'	i=1e+01	i in (1e+01,1e+01)	i in ('1e+01','1e+01')
+1	1	1	1
+DROP TABLE t1;
+create table t1(a bigint unsigned, b bigint);
+insert into t1 values (0xfffffffffffffffff, 0xfffffffffffffffff), 
+(0x10000000000000000, 0x10000000000000000), 
+(0x8fffffffffffffff, 0x8fffffffffffffff);
+Warnings:
+Warning	1264	Out of range value for column 'a' at row 1
+Warning	1264	Out of range value for column 'b' at row 1
+Warning	1264	Out of range value for column 'a' at row 2
+Warning	1264	Out of range value for column 'b' at row 2
+Warning	1264	Out of range value for column 'b' at row 3
+select hex(a), hex(b) from t1;
+hex(a)	hex(b)
+FFFFFFFFFFFFFFFF	7FFFFFFFFFFFFFFF
+FFFFFFFFFFFFFFFF	7FFFFFFFFFFFFFFF
+8FFFFFFFFFFFFFFF	7FFFFFFFFFFFFFFF
+drop table t1;
+CREATE TABLE t1 (c0 int);
+CREATE TABLE t2 (c0 int);
+INSERT INTO t1 VALUES(@@connect_timeout);
+INSERT INTO t2 VALUES(@@connect_timeout);
+SELECT * FROM t1 JOIN t2 ON t1.c0 = t2.c0 WHERE (t1.c0 <=> @@connect_timeout);
+c0	c0
+X	X
+DROP TABLE t1, t2;
+End of 4.1 tests
+CREATE TABLE t1 ( 
+K2C4 varchar(4) character set latin1 collate latin1_bin NOT NULL default '', 
+K4N4 varchar(4) character set latin1 collate latin1_bin NOT NULL default '0000', 
+F2I4 int(11) NOT NULL default '0' 
+) ENGINE=MyISAM DEFAULT CHARSET=latin1;
+INSERT INTO t1 VALUES 
+('W%RT', '0100',  1), 
+('W-RT', '0100', 1), 
+('WART', '0100', 1), 
+('WART', '0200', 1), 
+('WERT', '0100', 2), 
+('WORT','0200', 2), 
+('WT', '0100', 2), 
+('W_RT', '0100', 2), 
+('WaRT', '0100', 3), 
+('WART', '0300', 3), 
+('WRT' , '0400', 3), 
+('WURM', '0500', 3), 
+('W%T', '0600', 4), 
+('WA%T', '0700', 4), 
+('WA_T', '0800', 4);
+SELECT K2C4, K4N4, F2I4 FROM t1
+WHERE  K2C4 = 'WART' AND 
+(F2I4 = 2 AND K2C4 = 'WART' OR (F2I4 = 2 OR K4N4 = '0200'));
+K2C4	K4N4	F2I4
+WART	0200	1
+SELECT K2C4, K4N4, F2I4 FROM t1
+WHERE  K2C4 = 'WART' AND (K2C4 = 'WART' OR K4N4 = '0200');
+K2C4	K4N4	F2I4
+WART	0100	1
+WART	0200	1
+WART	0300	3
+DROP TABLE t1;
+create table t1 (a int, b int);
+create table t2 like t1;
+select t1.a from (t1 inner join t2 on t1.a=t2.a) where t2.a=1;
+a
+select t1.a from ((t1 inner join t2 on t1.a=t2.a)) where t2.a=1;
+a
+select x.a, y.a, z.a from ( (t1 x inner join t2 y on x.a=y.a) inner join t2 z on y.a=z.a) WHERE x.a=1;
+a	a	a
+drop table t1,t2;
+create table t1 (s1 varchar(5));
+insert into t1 values ('Wall');
+select min(s1) from t1 group by s1 with rollup;
+min(s1)
+Wall
+Wall
+drop table t1;
+create table t1 (s1 int) engine=myisam;
+insert into t1 values (0);
+select avg(distinct s1) from t1 group by s1 with rollup;
+avg(distinct s1)
+0.0000
+0.0000
+drop table t1;
+create table t1 (s1 int);
+insert into t1 values (null),(1);
+select distinct avg(s1) as x from t1 group by s1 with rollup;
+x
+NULL
+1.0000
+drop table t1;
+CREATE TABLE t1 (a int);
+CREATE TABLE t2 (a int);
+INSERT INTO t1 VALUES (1), (2), (3), (4), (5);
+INSERT INTO t2 VALUES (2), (4), (6);
+SELECT t1.a FROM t1 STRAIGHT_JOIN t2 ON t1.a=t2.a;
+a
+2
+4
+EXPLAIN SELECT t1.a FROM t1 STRAIGHT_JOIN t2 ON t1.a=t2.a;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	5	
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	3	Using where; Using join buffer
+EXPLAIN SELECT t1.a FROM t1 INNER JOIN t2 ON t1.a=t2.a;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	3	
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	5	Using where; Using join buffer
+DROP TABLE t1,t2;
+select x'10' + 0, X'10' + 0, b'10' + 0, B'10' + 0;
+x'10' + 0	X'10' + 0	b'10' + 0	B'10' + 0
+16	16	2	2
+create table t1 (f1 varchar(6) default NULL, f2 int(6) primary key not null);
+create table t2 (f3 varchar(5) not null, f4 varchar(5) not null, UNIQUE KEY UKEY (f3,f4));
+insert into t1 values (" 2", 2);
+insert into t2 values (" 2", " one "),(" 2", " two ");
+select * from t1 left join t2 on f1 = f3;
+f1	f2	f3	f4
+ 2	2	 2	 one 
+ 2	2	 2	 two 
+drop table t1,t2;
+create table t1 (empnum smallint, grp int);
+create table t2 (empnum int, name char(5));
+insert into t1 values(1,1);
+insert into t2 values(1,'bob');
+create view v1 as select * from t2 inner join t1 using (empnum);
+select * from v1;
+empnum	name	grp
+1	bob	1
+drop table t1,t2;
+drop view v1;
+create table t1 (pk int primary key, b int);
+create table t2 (pk int primary key, c int);
+select pk from t1 inner join t2 using (pk);
+pk
+drop table t1,t2;
+create table t1 (s1 int, s2 char(5), s3 decimal(10));
+create view v1 as select s1, s2, 'x' as s3 from t1;
+select * from t1 natural join v1;
+s1	s2	s3
+insert into t1 values (1,'x',5);
+select * from t1 natural join v1;
+s1	s2	s3
+Warnings:
+Warning	1292	Truncated incorrect DOUBLE value: 'x'
+drop table t1;
+drop view v1;
+create table t1(a1 int);
+create table t2(a2 int);
+insert into t1 values(1),(2);
+insert into t2 values(1),(2);
+create view v2 (c) as select a1 from t1;
+select * from t1 natural left join t2;
+a1	a2
+1	1
+2	1
+1	2
+2	2
+select * from t1 natural right join t2;
+a2	a1
+1	1
+2	1
+1	2
+2	2
+select * from v2 natural left join t2;
+c	a2
+1	1
+2	1
+1	2
+2	2
+select * from v2 natural right join t2;
+a2	c
+1	1
+2	1
+1	2
+2	2
+drop table t1, t2;
+drop view v2;
+create table t1 (a int(10), t1_val int(10));
+create table t2 (b int(10), t2_val int(10));
+create table t3 (a int(10), b int(10));
+insert into t1 values (1,1),(2,2);
+insert into t2 values (1,1),(2,2),(3,3);
+insert into t3 values (1,1),(2,1),(3,1),(4,1);
+select * from t1 natural join t2 natural join t3;
+a	b	t1_val	t2_val
+1	1	1	1
+2	1	2	1
+select * from t1 natural join t3 natural join t2;
+b	a	t1_val	t2_val
+1	1	1	1
+1	2	2	1
+drop table t1, t2, t3;
+DO IFNULL(NULL, NULL);
+SELECT CAST(IFNULL(NULL, NULL) AS DECIMAL);
+CAST(IFNULL(NULL, NULL) AS DECIMAL)
+NULL
+SELECT ABS(IFNULL(NULL, NULL));
+ABS(IFNULL(NULL, NULL))
+NULL
+SELECT IFNULL(NULL, NULL);
+IFNULL(NULL, NULL)
+NULL
+SET @OLD_SQL_MODE12595=@@SQL_MODE, @@SQL_MODE='';
+SHOW LOCAL VARIABLES LIKE 'SQL_MODE';
+Variable_name	Value
+sql_mode	
+CREATE TABLE BUG_12595(a varchar(100));
+INSERT INTO BUG_12595 VALUES ('hakan%'), ('hakank'), ("ha%an");
+SELECT * FROM BUG_12595 WHERE a LIKE 'hakan\%';
+a
+hakan%
+SELECT * FROM BUG_12595 WHERE a LIKE 'hakan*%' ESCAPE '*';
+a
+hakan%
+SELECT * FROM BUG_12595 WHERE a LIKE 'hakan**%' ESCAPE '**';
+ERROR HY000: Incorrect arguments to ESCAPE
+SELECT * FROM BUG_12595 WHERE a LIKE 'hakan%' ESCAPE '';
+a
+hakan%
+hakank
+SELECT * FROM BUG_12595 WHERE a LIKE 'hakan\%' ESCAPE '';
+a
+SELECT * FROM BUG_12595 WHERE a LIKE 'ha\%an' ESCAPE 0x5c;
+a
+ha%an
+SELECT * FROM BUG_12595 WHERE a LIKE 'ha%%an' ESCAPE '%';
+a
+ha%an
+SELECT * FROM BUG_12595 WHERE a LIKE 'ha\%an' ESCAPE '\\';
+a
+ha%an
+SELECT * FROM BUG_12595 WHERE a LIKE 'ha|%an' ESCAPE '|';
+a
+ha%an
+SET @@SQL_MODE='NO_BACKSLASH_ESCAPES';
+SHOW LOCAL VARIABLES LIKE 'SQL_MODE';
+Variable_name	Value
+sql_mode	NO_BACKSLASH_ESCAPES
+SELECT * FROM BUG_12595 WHERE a LIKE 'hakan\%';
+a
+SELECT * FROM BUG_12595 WHERE a LIKE 'hakan*%' ESCAPE '*';
+a
+hakan%
+SELECT * FROM BUG_12595 WHERE a LIKE 'hakan**%' ESCAPE '**';
+ERROR HY000: Incorrect arguments to ESCAPE
+SELECT * FROM BUG_12595 WHERE a LIKE 'hakan\%' ESCAPE '\\';
+ERROR HY000: Incorrect arguments to ESCAPE
+SELECT * FROM BUG_12595 WHERE a LIKE 'hakan%' ESCAPE '';
+ERROR HY000: Incorrect arguments to ESCAPE
+SELECT * FROM BUG_12595 WHERE a LIKE 'ha\%an' ESCAPE 0x5c;
+a
+ha%an
+SELECT * FROM BUG_12595 WHERE a LIKE 'ha|%an' ESCAPE '|';
+a
+ha%an
+SELECT * FROM BUG_12595 WHERE a LIKE 'hakan\n%' ESCAPE '\n';
+ERROR HY000: Incorrect arguments to ESCAPE
+SET @@SQL_MODE=@OLD_SQL_MODE12595;
+DROP TABLE BUG_12595;
+create table t1 (a char(1));
+create table t2 (a char(1));
+insert into t1 values ('a'),('b'),('c');
+insert into t2 values ('b'),('c'),('d');
+select a from t1 natural join t2;
+a
+b
+c
+select * from t1 natural join t2 where a = 'b';
+a
+b
+drop table t1, t2;
+CREATE TABLE t1 (`id` TINYINT);
+CREATE TABLE t2 (`id` TINYINT);
+CREATE TABLE t3 (`id` TINYINT);
+INSERT INTO t1 VALUES (1),(2),(3);
+INSERT INTO t2 VALUES (2);
+INSERT INTO t3 VALUES (3);
+SELECT t1.id,t3.id FROM t1 JOIN t2 ON (t2.id=t1.id) LEFT JOIN t3 USING (id);
+ERROR 23000: Column 'id' in from clause is ambiguous
+SELECT t1.id,t3.id FROM t1 JOIN t2 ON (t2.notacolumn=t1.id) LEFT JOIN t3 USING (id);
+ERROR 23000: Column 'id' in from clause is ambiguous
+SELECT id,t3.id FROM t1 JOIN t2 ON (t2.id=t1.id) LEFT JOIN t3 USING (id);
+ERROR 23000: Column 'id' in from clause is ambiguous
+SELECT id,t3.id FROM (t1 JOIN t2 ON (t2.id=t1.id)) LEFT JOIN t3 USING (id);
+ERROR 23000: Column 'id' in from clause is ambiguous
+drop table t1, t2, t3;
+create table t1 (a int(10),b int(10));
+create table t2 (a int(10),b int(10));
+insert into t1 values (1,10),(2,20),(3,30);
+insert into t2 values (1,10);
+select * from t1 inner join t2 using (A);
+a	b	b
+1	10	10
+select * from t1 inner join t2 using (a);
+a	b	b
+1	10	10
+drop table t1, t2;
+create table t1 (a int, c int);
+create table t2 (b int);
+create table t3 (b int, a int);
+create table t4 (c int);
+insert into t1 values (1,1);
+insert into t2 values (1);
+insert into t3 values (1,1);
+insert into t4 values (1);
+select * from t1 join t2 join t3 on (t2.b = t3.b and t1.a = t3.a);
+a	c	b	b	a
+1	1	1	1	1
+select * from t1, t2 join t3 on (t2.b = t3.b and t1.a = t3.a);
+ERROR 42S22: Unknown column 't1.a' in 'on clause'
+select * from t1 join t2 join t3 join t4 on (t1.a = t4.c and t2.b = t4.c);
+a	c	b	b	a	c
+1	1	1	1	1	1
+select * from t1 join t2 join t4 using (c);
+c	a	b
+1	1	1
+drop table t1, t2, t3, t4;
+create table t1(x int, y int);
+create table t2(x int, y int);
+create table t3(x int, primary key(x));
+insert into t1 values (1, 1), (2, 1), (3, 1), (4, 3), (5, 6), (6, 6);
+insert into t2 values (1, 1), (2, 1), (3, 3), (4, 6), (5, 6);
+insert into t3 values (1), (2), (3), (4), (5);
+select t1.x, t3.x from t1, t2, t3  where t1.x = t2.x and t3.x >= t1.y and t3.x <= t2.y;
+x	x
+1	1
+2	1
+3	1
+3	2
+3	3
+4	3
+4	4
+4	5
+drop table t1,t2,t3;
+create table t1 (id char(16) not null default '', primary key  (id));
+insert into t1 values ('100'),('101'),('102');
+create table t2 (id char(16) default null);
+insert into t2 values (1);
+create view v1 as select t1.id from t1;
+create view v2 as select t2.id from t2;
+create view v3 as select (t1.id+2) as id from t1 natural left join t2;
+select t1.id from t1 left join v2 using (id);
+id
+100
+101
+102
+select t1.id from v2 right join t1 using (id);
+id
+100
+101
+102
+select t1.id from t1 left join v3 using (id);
+id
+102
+100
+101
+select * from t1 left join v2 using (id);
+id
+100
+101
+102
+select * from v2 right join t1 using (id);
+id
+100
+101
+102
+select * from t1 left join v3 using (id);
+id
+102
+100
+101
+select v1.id from v1 left join v2 using (id);
+id
+100
+101
+102
+select v1.id from v2 right join v1 using (id);
+id
+100
+101
+102
+select v1.id from v1 left join v3 using (id);
+id
+102
+100
+101
+select * from v1 left join v2 using (id);
+id
+100
+101
+102
+select * from v2 right join v1 using (id);
+id
+100
+101
+102
+select * from v1 left join v3 using (id);
+id
+102
+100
+101
+drop table t1, t2;
+drop view v1, v2, v3;
+create table t1 (id int(11) not null default '0');
+insert into t1 values (123),(191),(192);
+create table t2 (id char(16) character set utf8 not null);
+insert into t2 values ('58013'),('58014'),('58015'),('58016');
+create table t3 (a_id int(11) not null, b_id char(16) character set utf8);
+insert into t3 values (123,null),(123,null),(123,null),(123,null),(123,null),(123,'58013');
+select count(*)
+from t1 inner join (t3 left join t2 on t2.id = t3.b_id) on t1.id = t3.a_id;
+count(*)
+6
+select count(*)
+from t1 inner join (t2 right join t3 on t2.id = t3.b_id) on t1.id = t3.a_id;
+count(*)
+6
+drop table t1,t2,t3;
+create table t1 (a int);
+create table t2 (b int);
+create table t3 (c int);
+select * from t1 join t2 join t3 on (t1.a=t3.c);
+a	b	c
+select * from t1 join t2 left join t3 on (t1.a=t3.c);
+a	b	c
+select * from t1 join t2 right join t3 on (t1.a=t3.c);
+a	b	c
+select * from t1 join t2 straight_join t3 on (t1.a=t3.c);
+a	b	c
+drop table t1, t2 ,t3;
+create table t1(f1 int, f2 date);
+insert into t1 values(1,'2005-01-01'),(2,'2005-09-01'),(3,'2005-09-30'),
+(4,'2005-10-01'),(5,'2005-12-30');
+select * from t1 where f2 >= 0            order by f2;
+f1	f2
+1	2005-01-01
+2	2005-09-01
+3	2005-09-30
+4	2005-10-01
+5	2005-12-30
+select * from t1 where f2 >= '0000-00-00' order by f2;
+f1	f2
+1	2005-01-01
+2	2005-09-01
+3	2005-09-30
+4	2005-10-01
+5	2005-12-30
+select * from t1 where f2 >= '2005-09-31' order by f2;
+f1	f2
+4	2005-10-01
+5	2005-12-30
+select * from t1 where f2 >= '2005-09-3a' order by f2;
+f1	f2
+3	2005-09-30
+4	2005-10-01
+5	2005-12-30
+Warnings:
+Warning	1292	Incorrect date value: '2005-09-3a' for column 'f2' at row 1
+select * from t1 where f2 <= '2005-09-31' order by f2;
+f1	f2
+1	2005-01-01
+2	2005-09-01
+3	2005-09-30
+select * from t1 where f2 <= '2005-09-3a' order by f2;
+f1	f2
+1	2005-01-01
+2	2005-09-01
+Warnings:
+Warning	1292	Incorrect date value: '2005-09-3a' for column 'f2' at row 1
+drop table t1;
+create table t1 (f1 int, f2 int);
+insert into t1 values (1, 30), (2, 20), (3, 10);
+create algorithm=merge view v1 as select f1, f2 from t1;
+create algorithm=merge view v2 (f2, f1) as select f1, f2 from t1;
+create algorithm=merge view v3 as select t1.f1 as f2, t1.f2 as f1 from t1;
+select t1.f1 as x1, f1 from t1 order by t1.f1;
+x1	f1
+1	1
+2	2
+3	3
+select v1.f1 as x1, f1 from v1 order by v1.f1;
+x1	f1
+1	1
+2	2
+3	3
+select v2.f1 as x1, f1 from v2 order by v2.f1;
+x1	f1
+10	10
+20	20
+30	30
+select v3.f1 as x1, f1 from v3 order by v3.f1;
+x1	f1
+10	10
+20	20
+30	30
+select f1, f2, v1.f1 as x1 from v1 order by v1.f1;
+f1	f2	x1
+1	30	1
+2	20	2
+3	10	3
+select f1, f2, v2.f1 as x1 from v2 order by v2.f1;
+f1	f2	x1
+10	3	10
+20	2	20
+30	1	30
+select f1, f2, v3.f1 as x1 from v3 order by v3.f1;
+f1	f2	x1
+10	3	10
+20	2	20
+30	1	30
+drop table t1;
+drop view v1, v2, v3;
+CREATE TABLE t1(key_a int4 NOT NULL, optimus varchar(32), PRIMARY KEY(key_a));
+CREATE TABLE t2(key_a int4 NOT NULL, prime varchar(32), PRIMARY KEY(key_a));
+CREATE table t3(key_a int4 NOT NULL, key_b int4 NOT NULL, foo varchar(32),
+PRIMARY KEY(key_a,key_b));
+INSERT INTO t1 VALUES (0,'');
+INSERT INTO t1 VALUES (1,'i');
+INSERT INTO t1 VALUES (2,'j');
+INSERT INTO t1 VALUES (3,'k');
+INSERT INTO t2 VALUES (1,'r');
+INSERT INTO t2 VALUES (2,'s');
+INSERT INTO t2 VALUES (3,'t');
+INSERT INTO t3 VALUES (1,5,'x');
+INSERT INTO t3 VALUES (1,6,'y');
+INSERT INTO t3 VALUES (2,5,'xx');
+INSERT INTO t3 VALUES (2,6,'yy');
+INSERT INTO t3 VALUES (2,7,'zz');
+INSERT INTO t3 VALUES (3,5,'xxx');
+SELECT t2.key_a,foo 
+FROM t1 INNER JOIN t2 ON t1.key_a = t2.key_a
+INNER JOIN t3 ON t1.key_a = t3.key_a
+WHERE t2.key_a=2 and key_b=5;
+key_a	foo
+2	xx
+EXPLAIN SELECT t2.key_a,foo 
+FROM t1 INNER JOIN t2 ON t1.key_a = t2.key_a
+INNER JOIN t3 ON t1.key_a = t3.key_a
+WHERE t2.key_a=2 and key_b=5;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	const	PRIMARY	PRIMARY	4	const	1	Using index
+1	SIMPLE	t2	const	PRIMARY	PRIMARY	4	const	1	Using index
+1	SIMPLE	t3	const	PRIMARY	PRIMARY	8	const,const	1	
+SELECT t2.key_a,foo 
+FROM t1 INNER JOIN t2 ON t2.key_a = t1.key_a
+INNER JOIN t3 ON t1.key_a = t3.key_a
+WHERE t2.key_a=2 and key_b=5;
+key_a	foo
+2	xx
+EXPLAIN SELECT t2.key_a,foo 
+FROM t1 INNER JOIN t2 ON t2.key_a = t1.key_a
+INNER JOIN t3 ON t1.key_a = t3.key_a
+WHERE t2.key_a=2 and key_b=5;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	const	PRIMARY	PRIMARY	4	const	1	Using index
+1	SIMPLE	t2	const	PRIMARY	PRIMARY	4	const	1	Using index
+1	SIMPLE	t3	const	PRIMARY	PRIMARY	8	const,const	1	
+DROP TABLE t1,t2,t3;
+create  table t1 (f1 int);
+insert into t1 values(1),(2);
+create table t2 (f2 int, f3 int, key(f2));
+insert into t2 values(1,1),(2,2);
+create table t3 (f4 int not null);
+insert into t3 values (2),(2),(2);
+select f1,(select count(*) from t2,t3 where f2=f1 and f3=f4) as count from t1;
+f1	count
+1	0
+2	3
+drop table t1,t2,t3;
+create table t1 (f1 int unique);
+create table t2 (f2 int unique);
+create table t3 (f3 int unique);
+insert into t1 values(1),(2);
+insert into t2 values(1),(2);
+insert into t3 values(1),(NULL);
+select * from t3 where f3 is null;
+f3
+NULL
+select t2.f2 from t1 left join t2 on f1=f2 join t3 on f1=f3 where f1=1;
+f2
+1
+drop table t1,t2,t3;
+create table t1(f1 char, f2 char not null);
+insert into t1 values(null,'a');
+create table t2 (f2 char not null);
+insert into t2 values('b');
+select * from t1 left join t2 on f1=t2.f2 where t1.f2='a';
+f1	f2	f2
+NULL	a	NULL
+drop table t1,t2;
+select * from (select * left join t on f1=f2) tt;
+ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'on f1=f2) tt' at line 1
+CREATE TABLE t1 (sku int PRIMARY KEY, pr int);
+CREATE TABLE t2 (sku int PRIMARY KEY, sppr int, name varchar(255));
+INSERT INTO t1 VALUES
+(10, 10), (20, 10), (30, 20), (40, 30), (50, 10), (60, 10);
+INSERT INTO t2 VALUES 
+(10, 10, 'aaa'), (20, 10, 'bbb'), (30, 10, 'ccc'), (40, 20, 'ddd'),
+(50, 10, 'eee'), (60, 20, 'fff'), (70, 20, 'ggg'), (80, 30, 'hhh');
+SELECT t2.sku, t2.sppr, t2.name, t1.sku, t1.pr
+FROM t2, t1 WHERE t2.sku=20 AND (t2.sku=t1.sku OR t2.sppr=t1.sku);
+sku	sppr	name	sku	pr
+20	10	bbb	10	10
+20	10	bbb	20	10
+EXPLAIN
+SELECT t2.sku, t2.sppr, t2.name, t1.sku, t1.pr
+FROM t2, t1 WHERE t2.sku=20 AND (t2.sku=t1.sku OR t2.sppr=t1.sku);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t2	const	PRIMARY	PRIMARY	4	const	1	
+1	SIMPLE	t1	range	PRIMARY	PRIMARY	4	NULL	2	Using index condition; Using MRR
+DROP TABLE t1,t2;
+CREATE TABLE t1 (i TINYINT UNSIGNED NOT NULL);
+INSERT t1 SET i = 0;
+UPDATE t1 SET i = -1;
+Warnings:
+Warning	1264	Out of range value for column 'i' at row 1
+SELECT * FROM t1;
+i
+0
+UPDATE t1 SET i = CAST(i - 1 AS SIGNED);
+Warnings:
+Warning	1264	Out of range value for column 'i' at row 1
+SELECT * FROM t1;
+i
+0
+UPDATE t1 SET i = i - 1;
+Warnings:
+Warning	1264	Out of range value for column 'i' at row 1
+SELECT * FROM t1;
+i
+255
+DROP TABLE t1;
+create table t1 (a int);
+insert into t1 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
+create table t2 (a int, b int, c int, e int, primary key(a,b,c));
+insert into t2 select A.a, B.a, C.a, C.a from t1 A, t1 B, t1 C;
+analyze table t2;
+Table	Op	Msg_type	Msg_text
+test.t2	analyze	status	OK
+select 'In next EXPLAIN, B.rows must be exactly 10:' Z;
+Z
+In next EXPLAIN, B.rows must be exactly 10:
+explain select * from t2 A, t2 B where A.a=5 and A.b=5 and A.C<5
+and B.a=5 and B.b=A.e and (B.b =1 or B.b = 3 or B.b=5);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	A	range	PRIMARY	PRIMARY	12	NULL	4	Using index condition; Using where; Using MRR
+1	SIMPLE	B	ref	PRIMARY	PRIMARY	8	const,test.A.e	10	Using join buffer
+drop table t1, t2;
+CREATE TABLE t1 (a int PRIMARY KEY, b int, INDEX(b));
+INSERT INTO t1 VALUES (1, 3), (9,4), (7,5), (4,5), (6,2),
+(3,1), (5,1), (8,9), (2,2), (0,9);
+CREATE TABLE t2 (c int, d int, f int, INDEX(c,f));
+INSERT INTO t2 VALUES
+(1,0,0), (1,0,1), (2,0,0), (2,0,1), (3,0,0), (4,0,1),
+(5,0,0), (5,0,1), (6,0,0), (0,0,1), (7,0,0), (7,0,1),
+(0,0,0), (0,0,1), (8,0,0), (8,0,1), (9,0,0), (9,0,1);
+EXPLAIN
+SELECT a, c, d, f FROM t1,t2 WHERE a=c AND b BETWEEN 4 AND 6;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	range	PRIMARY,b	b	5	NULL	3	Using index condition; Using MRR
+1	SIMPLE	t2	ref	c	c	5	test.t1.a	2	Using join buffer
+EXPLAIN
+SELECT a, c, d, f FROM t1,t2 WHERE a=c AND b BETWEEN 4 AND 6 AND a > 0;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	range	PRIMARY,b	b	5	NULL	3	Using index condition; Using where; Using MRR
+1	SIMPLE	t2	ref	c	c	5	test.t1.a	2	Using join buffer
+DROP TABLE t1, t2;
+create table t1 (
+a int unsigned    not null auto_increment primary key,
+b bit             not null,
+c bit             not null
+);
+create table t2 (
+a int unsigned    not null auto_increment primary key,
+b bit             not null,
+c int unsigned    not null,
+d varchar(50)
+);
+insert into t1 (b,c) values (0,1), (0,1);
+insert into t2 (b,c) values (0,1);
+select t1.a, t1.b + 0, t1.c + 0, t2.a, t2.b + 0, t2.c, t2.d
+from t1 left outer join t2 on t1.a = t2.c and t2.b <> 1
+where t1.b <> 1 order by t1.a;
+a	t1.b + 0	t1.c + 0	a	t2.b + 0	c	d
+1	0	1	1	0	1	NULL
+2	0	1	NULL	NULL	NULL	NULL
+drop table t1,t2;
+SELECT 0.9888889889 * 1.011111411911;
+0.9888889889 * 1.011111411911
+0.9998769417899202067879
+prepare stmt from 'select 1 as " a "';
+Warnings:
+Warning	1466	Leading spaces are removed from name ' a '
+execute stmt;
+a 
+1
+CREATE TABLE t1 (a int NOT NULL PRIMARY KEY, b int NOT NULL);
+INSERT INTO t1 VALUES (1,1), (2,2), (3,3), (4,4);
+CREATE TABLE t2 (c int NOT NULL, INDEX idx(c));
+INSERT INTO t2 VALUES
+(1), (1), (1), (1), (1), (1), (1), (1),
+(2), (2), (2), (2),
+(3), (3),
+(4);
+EXPLAIN SELECT b FROM t1, t2 WHERE b=c AND a=1;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	const	PRIMARY	PRIMARY	4	const	1	
+1	SIMPLE	t2	ref	idx	idx	4	const	7	Using index
+EXPLAIN SELECT b FROM t1, t2 WHERE b=c AND a=4;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	const	PRIMARY	PRIMARY	4	const	1	
+1	SIMPLE	t2	ref	idx	idx	4	const	1	Using index
+DROP TABLE t1, t2;
+CREATE TABLE t1 (id int NOT NULL PRIMARY KEY, a int);
+INSERT INTO t1 VALUES (1,2), (2,NULL), (3,2);
+CREATE TABLE t2 (b int, c INT, INDEX idx1(b));
+INSERT INTO t2 VALUES (2,1), (3,2);
+CREATE TABLE t3 (d int,  e int, INDEX idx1(d));
+INSERT INTO t3 VALUES (2,10), (2,20), (1,30), (2,40), (2,50);
+EXPLAIN
+SELECT * FROM t1 LEFT JOIN t2 ON t2.b=t1.a INNER JOIN t3 ON t3.d=t1.id
+WHERE t1.id=2;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	const	PRIMARY	PRIMARY	4	const	1	
+1	SIMPLE	t2	const	idx1	NULL	NULL	NULL	1	
+1	SIMPLE	t3	ref	idx1	idx1	5	const	3	
+SELECT * FROM t1 LEFT JOIN t2 ON t2.b=t1.a INNER JOIN t3 ON t3.d=t1.id
+WHERE t1.id=2;
+id	a	b	c	d	e
+2	NULL	NULL	NULL	2	10
+2	NULL	NULL	NULL	2	20
+2	NULL	NULL	NULL	2	40
+2	NULL	NULL	NULL	2	50
+DROP TABLE t1,t2,t3;
+create table t1 (c1 varchar(1), c2 int, c3 int, c4 int, c5 int, c6 int,
+c7 int, c8 int, c9 int, fulltext key (`c1`));
+select distinct match (`c1`) against ('z') , c2, c3, c4,c5, c6,c7, c8 
+from t1 where c9=1 order by c2, c2;
+match (`c1`) against ('z')	c2	c3	c4	c5	c6	c7	c8
+drop table t1;
+CREATE TABLE t1 (pk varchar(10) PRIMARY KEY, fk varchar(16));
+CREATE TABLE t2 (pk varchar(16) PRIMARY KEY, fk varchar(10));
+INSERT INTO t1 VALUES
+('d','dddd'), ('i','iii'), ('a','aa'), ('b','bb'), ('g','gg'), 
+('e','eee'), ('c','cccc'), ('h','hhh'), ('j','jjj'), ('f','fff');
+INSERT INTO t2 VALUES
+('jjj', 'j'), ('cc','c'), ('ccc','c'), ('aaa', 'a'), ('jjjj','j'),
+('hhh','h'), ('gg','g'), ('fff','f'), ('ee','e'), ('ffff','f'),
+('bbb','b'), ('ff','f'), ('cccc','c'), ('dddd','d'), ('jj','j'),
+('aaaa','a'), ('bb','b'), ('eeee','e'), ('aa','a'), ('hh','h');
+EXPLAIN SELECT t2.* 
+FROM t1 JOIN t2 ON t2.fk=t1.pk
+WHERE t2.fk < 'c' AND t2.pk=t1.fk;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	range	PRIMARY	PRIMARY	12	NULL	3	Using index condition; Using MRR
+1	SIMPLE	t2	eq_ref	PRIMARY	PRIMARY	18	test.t1.fk	1	Using where; Using join buffer
+EXPLAIN SELECT t2.* 
+FROM t1 JOIN t2 ON t2.fk=t1.pk 
+WHERE t2.fk BETWEEN 'a' AND 'b' AND t2.pk=t1.fk;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	range	PRIMARY	PRIMARY	12	NULL	2	Using index condition; Using MRR
+1	SIMPLE	t2	eq_ref	PRIMARY	PRIMARY	18	test.t1.fk	1	Using where; Using join buffer
+EXPLAIN SELECT t2.* 
+FROM t1 JOIN t2 ON t2.fk=t1.pk 
+WHERE t2.fk IN ('a','b') AND t2.pk=t1.fk;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	range	PRIMARY	PRIMARY	12	NULL	2	Using index condition; Using MRR
+1	SIMPLE	t2	eq_ref	PRIMARY	PRIMARY	18	test.t1.fk	1	Using where; Using join buffer
+DROP TABLE t1,t2;
+CREATE TABLE t1 (a int, b varchar(20) NOT NULL, PRIMARY KEY(a));
+CREATE TABLE t2 (a int, b varchar(20) NOT NULL,
+PRIMARY KEY (a), UNIQUE KEY (b));
+INSERT INTO t1 VALUES (1,'a'),(2,'b'),(3,'c');
+INSERT INTO t2 VALUES (1,'a'),(2,'b'),(3,'c');
+EXPLAIN SELECT t1.a FROM t1 LEFT JOIN t2 ON t2.b=t1.b WHERE t1.a=3;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	const	PRIMARY	PRIMARY	4	const	1	
+DROP TABLE t1,t2;
+CREATE TABLE t1(id int PRIMARY KEY, b int, e int);
+CREATE TABLE t2(i int, a int, INDEX si(i), INDEX ai(a));
+CREATE TABLE t3(a int PRIMARY KEY, c char(4), INDEX ci(c));
+INSERT INTO t1 VALUES 
+(1,10,19), (2,20,22), (4,41,42), (9,93,95), (7, 77,79),
+(6,63,67), (5,55,58), (3,38,39), (8,81,89);
+INSERT INTO t2 VALUES
+(21,210), (41,410), (82,820), (83,830), (84,840),
+(65,650), (51,510), (37,370), (94,940), (76,760),
+(22,220), (33,330), (40,400), (95,950), (38,380),
+(67,670), (88,880), (57,570), (96,960), (97,970);
+INSERT INTO t3 VALUES
+(210,'bb'), (950,'ii'), (400,'ab'), (500,'ee'), (220,'gg'),
+(440,'gg'), (310,'eg'), (380,'ee'), (840,'bb'), (830,'ff'),
+(230,'aa'), (960,'ii'), (410,'aa'), (510,'ee'), (290,'bb'),
+(450,'gg'), (320,'dd'), (390,'hh'), (850,'jj'), (860,'ff');
+EXPLAIN
+SELECT t3.a FROM t1,t2 FORCE INDEX (si),t3
+WHERE t1.id = 8 AND t2.i BETWEEN t1.b AND t1.e AND 
+t3.a=t2.a AND t3.c IN ('bb','ee');
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	const	PRIMARY	PRIMARY	4	const	1	
+1	SIMPLE	t2	range	si	si	5	NULL	4	Using index condition; Using MRR
+1	SIMPLE	t3	eq_ref	PRIMARY,ci	PRIMARY	4	test.t2.a	1	Using where; Using join buffer
+EXPLAIN
+SELECT t3.a FROM t1,t2,t3
+WHERE t1.id = 8 AND t2.i BETWEEN t1.b AND t1.e AND
+t3.a=t2.a AND t3.c IN ('bb','ee') ;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	const	PRIMARY	PRIMARY	4	const	1	
+1	SIMPLE	t2	range	si,ai	si	5	NULL	4	Using index condition; Using MRR
+1	SIMPLE	t3	eq_ref	PRIMARY,ci	PRIMARY	4	test.t2.a	1	Using where; Using join buffer
+EXPLAIN 
+SELECT t3.a FROM t1,t2 FORCE INDEX (si),t3
+WHERE t1.id = 8 AND (t2.i=t1.b OR t2.i=t1.e) AND t3.a=t2.a AND
+t3.c IN ('bb','ee');
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	const	PRIMARY	PRIMARY	4	const	1	
+1	SIMPLE	t2	range	si	si	5	NULL	2	Using index condition; Using MRR
+1	SIMPLE	t3	eq_ref	PRIMARY,ci	PRIMARY	4	test.t2.a	1	Using where; Using join buffer
+EXPLAIN 
+SELECT t3.a FROM t1,t2,t3
+WHERE t1.id = 8 AND (t2.i=t1.b OR t2.i=t1.e) AND t3.a=t2.a AND
+t3.c IN ('bb','ee');
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	const	PRIMARY	PRIMARY	4	const	1	
+1	SIMPLE	t2	range	si,ai	si	5	NULL	2	Using index condition; Using MRR
+1	SIMPLE	t3	eq_ref	PRIMARY,ci	PRIMARY	4	test.t2.a	1	Using where; Using join buffer
+DROP TABLE t1,t2,t3;
+CREATE TABLE t1 ( f1 int primary key, f2 int, f3 int, f4 int, f5 int, f6 int, checked_out int);
+CREATE TABLE t2 ( f11 int PRIMARY KEY );
+INSERT INTO t1 VALUES (1,1,1,0,0,0,0),(2,1,1,3,8,1,0),(3,1,1,4,12,1,0);
+INSERT INTO t2 VALUES (62);
+SELECT * FROM t1 LEFT JOIN t2 ON f11 = t1.checked_out GROUP BY f1 ORDER BY f2, f3, f4, f5 LIMIT 0, 1;
+f1	f2	f3	f4	f5	f6	checked_out	f11
+1	1	1	0	0	0	0	NULL
+DROP TABLE t1, t2;
+DROP TABLE IF EXISTS t1;
+CREATE TABLE t1(a int);
+INSERT into t1 values (1), (2), (3);
+SELECT * FROM t1 LIMIT 2, -1;
+ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '-1' at line 1
+DROP TABLE t1;
+CREATE TABLE t1 (
+ID_with_null int NULL,
+ID_better int NOT NULL,
+INDEX idx1 (ID_with_null),
+INDEX idx2 (ID_better)
+);
+INSERT INTO t1 VALUES (1,1), (2,1), (null,3), (null,3), (null,3), (null,3);
+INSERT INTO t1 SELECT * FROM t1 WHERE ID_with_null IS NULL;
+INSERT INTO t1 SELECT * FROM t1 WHERE ID_with_null IS NULL;
+INSERT INTO t1 SELECT * FROM t1 WHERE ID_with_null IS NULL;
+INSERT INTO t1 SELECT * FROM t1 WHERE ID_with_null IS NULL;
+INSERT INTO t1 SELECT * FROM t1 WHERE ID_with_null IS NULL;
+SELECT COUNT(*) FROM t1 WHERE ID_with_null IS NULL;
+COUNT(*)
+128
+SELECT COUNT(*) FROM t1 WHERE ID_better=1;
+COUNT(*)
+2
+EXPLAIN SELECT * FROM t1 WHERE ID_better=1 AND ID_with_null IS NULL;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	ref	idx1,idx2	idx2	4	const	1	Using where
+DROP INDEX idx1 ON t1;
+CREATE UNIQUE INDEX idx1 ON t1(ID_with_null);
+EXPLAIN SELECT * FROM t1 WHERE ID_better=1 AND ID_with_null IS NULL;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	ref	idx1,idx2	idx2	4	const	1	Using where
+DROP TABLE t1;
+CREATE TABLE t1 (
+ID1_with_null int NULL,
+ID2_with_null int NULL,
+ID_better int NOT NULL,
+INDEX idx1 (ID1_with_null, ID2_with_null),
+INDEX idx2 (ID_better)
+);
+INSERT INTO t1 VALUES (1,1,1), (2,2,1), (3,null,3), (null,3,3), (null,null,3),
+(3,null,3), (null,3,3), (null,null,3), (3,null,3), (null,3,3), (null,null,3);
+INSERT INTO t1 SELECT * FROM t1 WHERE ID1_with_null IS NULL;
+INSERT INTO t1 SELECT * FROM t1 WHERE ID2_with_null IS NULL;
+INSERT INTO t1 SELECT * FROM t1 WHERE ID1_with_null IS NULL;
+INSERT INTO t1 SELECT * FROM t1 WHERE ID2_with_null IS NULL;
+INSERT INTO t1 SELECT * FROM t1 WHERE ID1_with_null IS NULL;
+INSERT INTO t1 SELECT * FROM t1 WHERE ID2_with_null IS NULL;
+SELECT COUNT(*) FROM t1 WHERE ID1_with_null IS NULL AND ID2_with_null=3;
+COUNT(*)
+24
+SELECT COUNT(*) FROM t1 WHERE ID1_with_null=3 AND ID2_with_null IS NULL;
+COUNT(*)
+24
+SELECT COUNT(*) FROM t1 WHERE ID1_with_null IS NULL AND ID2_with_null IS NULL;
+COUNT(*)
+192
+SELECT COUNT(*) FROM t1 WHERE ID_better=1;
+COUNT(*)
+2
+EXPLAIN SELECT * FROM t1
+WHERE ID_better=1 AND ID1_with_null IS NULL AND ID2_with_null=3 ;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	ref	idx1,idx2	idx2	4	const	1	Using where
+EXPLAIN SELECT * FROM t1
+WHERE ID_better=1 AND ID1_with_null=3 AND ID2_with_null=3 IS NULL ;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	ref	idx1,idx2	idx2	4	const	1	Using where
+EXPLAIN SELECT * FROM t1
+WHERE ID_better=1 AND ID1_with_null IS NULL AND ID2_with_null IS NULL;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	ref	idx1,idx2	idx2	4	const	1	Using where
+DROP INDEX idx1 ON t1;
+CREATE UNIQUE INDEX idx1 ON t1(ID1_with_null,ID2_with_null);
+EXPLAIN SELECT * FROM t1
+WHERE ID_better=1 AND ID1_with_null IS NULL AND ID2_with_null=3 ;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	ref	idx1,idx2	idx2	4	const	1	Using where
+EXPLAIN SELECT * FROM t1
+WHERE ID_better=1 AND ID1_with_null=3 AND ID2_with_null IS NULL ;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	ref	idx1,idx2	idx2	4	const	1	Using where
+EXPLAIN SELECT * FROM t1
+WHERE ID_better=1 AND ID1_with_null IS NULL AND ID2_with_null IS NULL;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	ref	idx1,idx2	idx2	4	const	1	Using where
+EXPLAIN SELECT * FROM t1
+WHERE ID_better=1 AND ID1_with_null IS NULL AND 
+(ID2_with_null=1 OR ID2_with_null=2);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	ref	idx1,idx2	idx2	4	const	1	Using where
+DROP TABLE t1;
+CREATE TABLE t1 (a INT, ts TIMESTAMP, KEY ts(ts));
+INSERT INTO t1 VALUES (30,"2006-01-03 23:00:00"), (31,"2006-01-03 23:00:00");
+ANALYZE TABLE t1;
+Table	Op	Msg_type	Msg_text
+test.t1	analyze	status	OK
+CREATE TABLE t2 (a INT, dt1 DATETIME, dt2 DATETIME, PRIMARY KEY (a));
+INSERT INTO t2 VALUES (30, "2006-01-01 00:00:00", "2999-12-31 00:00:00");
+INSERT INTO t2 SELECT a+1,dt1,dt2 FROM t2;
+ANALYZE TABLE t2;
+Table	Op	Msg_type	Msg_text
+test.t2	analyze	status	OK
+EXPLAIN
+SELECT * FROM t1 LEFT JOIN t2 ON (t1.a=t2.a) WHERE t1.a=30
+AND t1.ts BETWEEN t2.dt1 AND t2.dt2
+AND t1.ts BETWEEN "2006-01-01" AND "2006-12-31";
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t2	const	PRIMARY	PRIMARY	4	const	1	
+1	SIMPLE	t1	range	ts	ts	4	NULL	1	Using index condition; Using where; Using MRR
+Warnings:
+Warning	1292	Incorrect datetime value: '2999-12-31 00:00:00' for column 'ts' at row 1
+SELECT * FROM t1 LEFT JOIN t2 ON (t1.a=t2.a) WHERE t1.a=30
+AND t1.ts BETWEEN t2.dt1 AND t2.dt2
+AND t1.ts BETWEEN "2006-01-01" AND "2006-12-31";
+a	ts	a	dt1	dt2
+30	2006-01-03 23:00:00	30	2006-01-01 00:00:00	2999-12-31 00:00:00
+Warnings:
+Warning	1292	Incorrect datetime value: '2999-12-31 00:00:00' for column 'ts' at row 1
+DROP TABLE t1,t2;
+create table t1 (a bigint unsigned);
+insert into t1 values
+(if(1, 9223372036854775808, 1)),
+(case when 1 then 9223372036854775808 else 1 end),
+(coalesce(9223372036854775808, 1));
+select * from t1;
+a
+9223372036854775808
+9223372036854775808
+9223372036854775808
+drop table t1;
+create table t1 select
+if(1, 9223372036854775808, 1) i,
+case when 1 then 9223372036854775808 else 1 end c,
+coalesce(9223372036854775808, 1) co;
+show create table t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `i` decimal(19,0) NOT NULL DEFAULT '0',
+  `c` decimal(19,0) NOT NULL DEFAULT '0',
+  `co` decimal(19,0) NOT NULL DEFAULT '0'
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+drop table t1;
+select 
+if(1, cast(1111111111111111111 as unsigned), 1) i,
+case when 1 then cast(1111111111111111111 as unsigned) else 1 end c,
+coalesce(cast(1111111111111111111 as unsigned), 1) co;
+i	c	co
+1111111111111111111	1111111111111111111	1111111111111111111
+CREATE TABLE t1 (name varchar(255));
+CREATE TABLE t2 (name varchar(255), n int, KEY (name(3)));
+INSERT INTO t1 VALUES ('ccc'), ('bb'), ('cc '), ('aa  '), ('aa');
+INSERT INTO t2 VALUES ('bb',1), ('aa',2), ('cc   ',3);
+INSERT INTO t2 VALUES (concat('cc ', 0x06), 4);
+INSERT INTO t2 VALUES ('cc',5), ('bb ',6), ('cc ',7);
+SELECT * FROM t2;
+name	n
+bb	1
+aa	2
+cc   	3
+cc 	4
+cc	5
+bb 	6
+cc 	7
+SELECT * FROM t2 ORDER BY name;
+name	n
+aa	2
+bb	1
+bb 	6
+cc 	4
+cc   	3
+cc	5
+cc 	7
+SELECT name, LENGTH(name), n FROM t2 ORDER BY name;
+name	LENGTH(name)	n
+aa	2	2
+bb	2	1
+bb 	3	6
+cc 	4	4
+cc   	5	3
+cc	2	5
+cc 	3	7
+EXPLAIN SELECT name, LENGTH(name), n FROM t2 WHERE name='cc ';
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t2	ref	name	name	6	const	3	Using where
+SELECT name, LENGTH(name), n FROM t2 WHERE name='cc ';
+name	LENGTH(name)	n
+cc   	5	3
+cc	2	5
+cc 	3	7
+EXPLAIN SELECT name , LENGTH(name), n FROM t2 WHERE name LIKE 'cc%';
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t2	range	name	name	6	NULL	3	Using where
+SELECT name , LENGTH(name), n FROM t2 WHERE name LIKE 'cc%';
+name	LENGTH(name)	n
+cc   	5	3
+cc 	4	4
+cc	2	5
+cc 	3	7
+EXPLAIN SELECT name , LENGTH(name), n FROM t2 WHERE name LIKE 'cc%' ORDER BY name;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t2	range	name	name	6	NULL	3	Using where; Using filesort
+SELECT name , LENGTH(name), n FROM t2 WHERE name LIKE 'cc%' ORDER BY name;
+name	LENGTH(name)	n
+cc 	4	4
+cc   	5	3
+cc	2	5
+cc 	3	7
+EXPLAIN SELECT * FROM t1 LEFT JOIN t2 ON t1.name=t2.name;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	5	
+1	SIMPLE	t2	ref	name	name	6	test.t1.name	2	Using where
+SELECT * FROM t1 LEFT JOIN t2 ON t1.name=t2.name;
+name	name	n
+ccc	NULL	NULL
+bb	bb	1
+bb	bb 	6
+cc 	cc   	3
+cc 	cc	5
+cc 	cc 	7
+aa  	aa	2
+aa	aa	2
+DROP TABLE t1,t2;
+CREATE TABLE t1 (name text);
+CREATE TABLE t2 (name text, n int, KEY (name(3)));
+INSERT INTO t1 VALUES ('ccc'), ('bb'), ('cc '), ('aa  '), ('aa');
+INSERT INTO t2 VALUES ('bb',1), ('aa',2), ('cc   ',3);
+INSERT INTO t2 VALUES (concat('cc ', 0x06), 4);
+INSERT INTO t2 VALUES ('cc',5), ('bb ',6), ('cc ',7);
+SELECT * FROM t2;
+name	n
+bb	1
+aa	2
+cc   	3
+cc 	4
+cc	5
+bb 	6
+cc 	7
+SELECT * FROM t2 ORDER BY name;
+name	n
+aa	2
+bb	1
+bb 	6
+cc 	4
+cc   	3
+cc	5
+cc 	7
+SELECT name, LENGTH(name), n FROM t2 ORDER BY name;
+name	LENGTH(name)	n
+aa	2	2
+bb	2	1
+bb 	3	6
+cc 	4	4
+cc   	5	3
+cc	2	5
+cc 	3	7
+EXPLAIN SELECT name, LENGTH(name), n FROM t2 WHERE name='cc ';
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t2	ref	name	name	6	const	3	Using where
+SELECT name, LENGTH(name), n FROM t2 WHERE name='cc ';
+name	LENGTH(name)	n
+cc   	5	3
+cc	2	5
+cc 	3	7
+EXPLAIN SELECT name , LENGTH(name), n FROM t2 WHERE name LIKE 'cc%';
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t2	range	name	name	6	NULL	3	Using where
+SELECT name , LENGTH(name), n FROM t2 WHERE name LIKE 'cc%';
+name	LENGTH(name)	n
+cc   	5	3
+cc 	4	4
+cc	2	5
+cc 	3	7
+EXPLAIN SELECT name , LENGTH(name), n FROM t2 WHERE name LIKE 'cc%' ORDER BY name;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t2	range	name	name	6	NULL	3	Using where; Using filesort
+SELECT name , LENGTH(name), n FROM t2 WHERE name LIKE 'cc%' ORDER BY name;
+name	LENGTH(name)	n
+cc 	4	4
+cc   	5	3
+cc	2	5
+cc 	3	7
+EXPLAIN SELECT * FROM t1 LEFT JOIN t2 ON t1.name=t2.name;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	5	
+1	SIMPLE	t2	ref	name	name	6	test.t1.name	2	Using where
+SELECT * FROM t1 LEFT JOIN t2 ON t1.name=t2.name;
+name	name	n
+ccc	NULL	NULL
+bb	bb	1
+bb	bb 	6
+cc 	cc   	3
+cc 	cc	5
+cc 	cc 	7
+aa  	aa	2
+aa	aa	2
+DROP TABLE t1,t2;
+CREATE TABLE t1 (
+access_id int NOT NULL default '0',
+name varchar(20) default NULL,
+rank int NOT NULL default '0',
+KEY idx (access_id)
+);
+CREATE TABLE t2 (
+faq_group_id int NOT NULL default '0',
+faq_id int NOT NULL default '0',
+access_id int default NULL,
+UNIQUE KEY idx1 (faq_id),
+KEY idx2 (faq_group_id,faq_id)
+);
+INSERT INTO t1 VALUES 
+(1,'Everyone',2),(2,'Help',3),(3,'Technical Support',1),(4,'Chat User',4);
+INSERT INTO t2 VALUES
+(261,265,1),(490,494,1);
+SELECT t2.faq_id 
+FROM t1 INNER JOIN t2 IGNORE INDEX (idx1)
+ON (t1.access_id = t2.access_id)
+LEFT JOIN t2 t
+ON (t.faq_group_id = t2.faq_group_id AND
+find_in_set(t.access_id, '1,4') < find_in_set(t2.access_id, '1,4'))
+WHERE
+t2.access_id IN (1,4) AND t.access_id IS NULL AND t2.faq_id in (265);
+faq_id
+265
+SELECT t2.faq_id 
+FROM t1 INNER JOIN t2
+ON (t1.access_id = t2.access_id)
+LEFT JOIN t2 t
+ON (t.faq_group_id = t2.faq_group_id AND
+find_in_set(t.access_id, '1,4') < find_in_set(t2.access_id, '1,4'))
+WHERE
+t2.access_id IN (1,4) AND t.access_id IS NULL AND t2.faq_id in (265);
+faq_id
+265
+DROP TABLE t1,t2;
+CREATE TABLE t1 (a INT, b INT, KEY inx (b,a));
+INSERT INTO t1 VALUES (1,1), (1,2), (1,3), (1,4), (1,5), (1, 6), (1,7);
+EXPLAIN SELECT COUNT(*) FROM t1 f1 INNER JOIN t1 f2
+ON ( f1.b=f2.b AND f1.a<f2.a ) 
+WHERE 1 AND f1.b NOT IN (100,2232,3343,51111);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	f1	index	inx	inx	10	NULL	7	Using where; Using index
+1	SIMPLE	f2	ref	inx	inx	5	test.f1.b	1	Using where; Using index
+DROP TABLE t1;
+CREATE TABLE t1 (c1 INT, c2 INT);
+INSERT INTO t1 VALUES (1,11), (2,22), (2,22);
+EXPLAIN SELECT c1 FROM t1 WHERE (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT COUNT(c2)))))))))))))))))))))))))))))))) > 0;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	3	Using where
+31	DEPENDENT SUBQUERY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
+32	DEPENDENT SUBQUERY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
+EXPLAIN SELECT c1 FROM t1 WHERE (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT (SELECT COUNT(c2))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))) > 0;
+ERROR HY000: Too high level of nesting for select
+DROP TABLE t1;
+CREATE TABLE t1 (
+c1 int(11) NOT NULL AUTO_INCREMENT,
+c2 varchar(1000) DEFAULT NULL,
+c3 bigint(20) DEFAULT NULL,
+c4 bigint(20) DEFAULT NULL,
+PRIMARY KEY (c1)
+);
+EXPLAIN EXTENDED 
+SELECT  join_2.c1  
+FROM 
+t1 AS join_0, 
+t1 AS join_1, 
+t1 AS join_2, 
+t1 AS join_3, 
+t1 AS join_4, 
+t1 AS join_5, 
+t1 AS join_6, 
+t1 AS join_7
+WHERE 
+join_0.c1=join_1.c1  AND 
+join_1.c1=join_2.c1  AND 
+join_2.c1=join_3.c1  AND 
+join_3.c1=join_4.c1  AND 
+join_4.c1=join_5.c1  AND 
+join_5.c1=join_6.c1  AND 
+join_6.c1=join_7.c1 
+OR 
+join_0.c2 < '?'  AND 
+join_1.c2 < '?'  AND
+join_2.c2 > '?'  AND
+join_2.c2 < '!'  AND
+join_3.c2 > '?'  AND 
+join_4.c2 = '?'  AND 
+join_5.c2 <> '?' AND
+join_6.c2 <> '?' AND 
+join_7.c2 >= '?' AND
+join_0.c1=join_1.c1  AND 
+join_1.c1=join_2.c1  AND 
+join_2.c1=join_3.c1  AND
+join_3.c1=join_4.c1  AND 
+join_4.c1=join_5.c1  AND 
+join_5.c1=join_6.c1  AND 
+join_6.c1=join_7.c1
+GROUP BY 
+join_3.c1,
+join_2.c1,
+join_7.c1,
+join_1.c1,
+join_0.c1;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables
+Warnings:
+Note	1003	select '0' AS `c1` from `test`.`t1` `join_0` join `test`.`t1` `join_1` join `test`.`t1` `join_2` join `test`.`t1` `join_3` join `test`.`t1` `join_4` join `test`.`t1` `join_5` join `test`.`t1` `join_6` join `test`.`t1` `join_7` where 0 group by '0','0','0','0','0'
+SHOW WARNINGS;
+Level	Code	Message
+Note	1003	select '0' AS `c1` from `test`.`t1` `join_0` join `test`.`t1` `join_1` join `test`.`t1` `join_2` join `test`.`t1` `join_3` join `test`.`t1` `join_4` join `test`.`t1` `join_5` join `test`.`t1` `join_6` join `test`.`t1` `join_7` where 0 group by '0','0','0','0','0'
+DROP TABLE t1;
+SELECT 1 AS ` `;
+
+1
+Warnings:
+Warning	1474	Name ' ' has become ''
+SELECT 1 AS `  `;
+
+1
+Warnings:
+Warning	1474	Name '  ' has become ''
+SELECT 1 AS ` x`;
+x
+1
+Warnings:
+Warning	1466	Leading spaces are removed from name ' x'
+CREATE VIEW v1 AS SELECT 1 AS ``;
+ERROR 42000: Incorrect column name ''
+CREATE VIEW v1 AS SELECT 1 AS ` `;
+ERROR 42000: Incorrect column name ' '
+CREATE VIEW v1 AS SELECT 1 AS `  `;
+ERROR 42000: Incorrect column name '  '
+CREATE VIEW v1 AS SELECT (SELECT 1 AS `  `);
+ERROR 42000: Incorrect column name '  '
+CREATE VIEW v1 AS SELECT 1 AS ` x`;
+Warnings:
+Warning	1466	Leading spaces are removed from name ' x'
+SELECT `x` FROM v1;
+x
+1
+ALTER VIEW v1 AS SELECT 1 AS ` `;
+ERROR 42000: Incorrect column name ' '
+DROP VIEW v1;
+select str_to_date('2007-10-09','%Y-%m-%d') between '2007/10/01 00:00:00 GMT'
+                                                and '2007/10/20 00:00:00 GMT';
+str_to_date('2007-10-09','%Y-%m-%d') between '2007/10/01 00:00:00 GMT'
+                                                and '2007/10/20 00:00:00 GMT'
+1
+Warnings:
+Warning	1292	Truncated incorrect datetime value: '2007/10/01 00:00:00 GMT'
+Warning	1292	Truncated incorrect datetime value: '2007/10/20 00:00:00 GMT'
+select str_to_date('2007-10-09','%Y-%m-%d') > '2007/10/01 00:00:00 GMT-6';
+str_to_date('2007-10-09','%Y-%m-%d') > '2007/10/01 00:00:00 GMT-6'
+1
+Warnings:
+Warning	1292	Truncated incorrect date value: '2007/10/01 00:00:00 GMT-6'
+select str_to_date('2007-10-09','%Y-%m-%d') <= '2007/10/2000:00:00 GMT-6';
+str_to_date('2007-10-09','%Y-%m-%d') <= '2007/10/2000:00:00 GMT-6'
+1
+Warnings:
+Warning	1292	Truncated incorrect date value: '2007/10/2000:00:00 GMT-6'
+select str_to_date('2007-10-01','%Y-%m-%d') = '2007-10-1 00:00:00 GMT-6';
+str_to_date('2007-10-01','%Y-%m-%d') = '2007-10-1 00:00:00 GMT-6'
+1
+Warnings:
+Warning	1292	Truncated incorrect date value: '2007-10-1 00:00:00 GMT-6'
+select str_to_date('2007-10-01','%Y-%m-%d') = '2007-10-01 x00:00:00 GMT-6';
+str_to_date('2007-10-01','%Y-%m-%d') = '2007-10-01 x00:00:00 GMT-6'
+1
+Warnings:
+Warning	1292	Truncated incorrect date value: '2007-10-01 x00:00:00 GMT-6'
+select str_to_date('2007-10-01','%Y-%m-%d %H:%i:%s') = '2007-10-01 00:00:00 GMT-6';
+str_to_date('2007-10-01','%Y-%m-%d %H:%i:%s') = '2007-10-01 00:00:00 GMT-6'
+1
+Warnings:
+Warning	1292	Truncated incorrect datetime value: '2007-10-01 00:00:00 GMT-6'
+select str_to_date('2007-10-01','%Y-%m-%d %H:%i:%s') = '2007-10-01 00:x00:00 GMT-6';
+str_to_date('2007-10-01','%Y-%m-%d %H:%i:%s') = '2007-10-01 00:x00:00 GMT-6'
+1
+Warnings:
+Warning	1292	Truncated incorrect datetime value: '2007-10-01 00:x00:00 GMT-6'
+select str_to_date('2007-10-01','%Y-%m-%d %H:%i:%s') = '2007-10-01 x12:34:56 GMT-6';
+str_to_date('2007-10-01','%Y-%m-%d %H:%i:%s') = '2007-10-01 x12:34:56 GMT-6'
+1
+Warnings:
+Warning	1292	Truncated incorrect datetime value: '2007-10-01 x12:34:56 GMT-6'
+select str_to_date('2007-10-01 12:34:00','%Y-%m-%d %H:%i:%s') = '2007-10-01 12:34x:56 GMT-6';
+str_to_date('2007-10-01 12:34:00','%Y-%m-%d %H:%i:%s') = '2007-10-01 12:34x:56 GMT-6'
+1
+Warnings:
+Warning	1292	Truncated incorrect datetime value: '2007-10-01 12:34x:56 GMT-6'
+select str_to_date('2007-10-01 12:34:56','%Y-%m-%d %H:%i:%s') = '2007-10-01 12:34x:56 GMT-6';
+str_to_date('2007-10-01 12:34:56','%Y-%m-%d %H:%i:%s') = '2007-10-01 12:34x:56 GMT-6'
+0
+Warnings:
+Warning	1292	Truncated incorrect datetime value: '2007-10-01 12:34x:56 GMT-6'
+select str_to_date('2007-10-01 12:34:56','%Y-%m-%d %H:%i:%s') = '2007-10-01 12:34:56';
+str_to_date('2007-10-01 12:34:56','%Y-%m-%d %H:%i:%s') = '2007-10-01 12:34:56'
+1
+select str_to_date('2007-10-01','%Y-%m-%d') = '2007-10-01 12:00:00';
+str_to_date('2007-10-01','%Y-%m-%d') = '2007-10-01 12:00:00'
+0
+select str_to_date('2007-10-01 12','%Y-%m-%d %H') = '2007-10-01 12:00:00';
+str_to_date('2007-10-01 12','%Y-%m-%d %H') = '2007-10-01 12:00:00'
+1
+select str_to_date('2007-10-01 12:34','%Y-%m-%d %H') = '2007-10-01 12:00:00';
+str_to_date('2007-10-01 12:34','%Y-%m-%d %H') = '2007-10-01 12:00:00'
+1
+Warnings:
+Warning	1292	Truncated incorrect datetime value: '2007-10-01 12:34'
+select str_to_date('2007-02-30 12:34','%Y-%m-%d %H:%i') = '2007-02-30 12:34';
+str_to_date('2007-02-30 12:34','%Y-%m-%d %H:%i') = '2007-02-30 12:34'
+1
+select str_to_date('2007-10-00 12:34','%Y-%m-%d %H:%i') = '2007-10-00 12:34';
+str_to_date('2007-10-00 12:34','%Y-%m-%d %H:%i') = '2007-10-00 12:34'
+1
+select str_to_date('2007-10-00','%Y-%m-%d') between '2007/09/01 00:00:00'
+                                                and '2007/10/20 00:00:00';
+str_to_date('2007-10-00','%Y-%m-%d') between '2007/09/01 00:00:00'
+                                                and '2007/10/20 00:00:00'
+1
+set SQL_MODE=TRADITIONAL;
+select str_to_date('2007-10-00 12:34','%Y-%m-%d %H:%i') = '2007-10-00 12:34';
+str_to_date('2007-10-00 12:34','%Y-%m-%d %H:%i') = '2007-10-00 12:34'
+0
+Warnings:
+Warning	1292	Truncated incorrect datetime value: '2007-10-00 12:34'
+select str_to_date('2007-10-01 12:34','%Y-%m-%d %H:%i') = '2007-10-00 12:34';
+str_to_date('2007-10-01 12:34','%Y-%m-%d %H:%i') = '2007-10-00 12:34'
+0
+Warnings:
+Warning	1292	Truncated incorrect datetime value: '2007-10-00 12:34'
+select str_to_date('2007-10-00 12:34','%Y-%m-%d %H:%i') = '2007-10-01 12:34';
+str_to_date('2007-10-00 12:34','%Y-%m-%d %H:%i') = '2007-10-01 12:34'
+0
+Warnings:
+Warning	1292	Truncated incorrect datetime value: '2007-10-00 12:34:00'
+select str_to_date('2007-10-00','%Y-%m-%d') between '2007/09/01'
+                                                and '2007/10/20';
+str_to_date('2007-10-00','%Y-%m-%d') between '2007/09/01'
+                                                and '2007/10/20'
+0
+Warnings:
+Warning	1292	Incorrect datetime value: '2007-10-00' for column '2007/09/01' at row 1
+Warning	1292	Incorrect datetime value: '2007-10-00' for column '2007/10/20' at row 1
+set SQL_MODE=DEFAULT;
+select str_to_date('2007-10-00','%Y-%m-%d') between '' and '2007/10/20';
+str_to_date('2007-10-00','%Y-%m-%d') between '' and '2007/10/20'
+1
+Warnings:
+Warning	1292	Truncated incorrect datetime value: ''
+select str_to_date('','%Y-%m-%d') between '2007/10/01' and '2007/10/20';
+str_to_date('','%Y-%m-%d') between '2007/10/01' and '2007/10/20'
+0
+select str_to_date('','%Y-%m-%d %H:%i') = '2007-10-01 12:34';
+str_to_date('','%Y-%m-%d %H:%i') = '2007-10-01 12:34'
+0
+select str_to_date(NULL,'%Y-%m-%d %H:%i') = '2007-10-01 12:34';
+str_to_date(NULL,'%Y-%m-%d %H:%i') = '2007-10-01 12:34'
+NULL
+select str_to_date('2007-10-00 12:34','%Y-%m-%d %H:%i') = '';
+str_to_date('2007-10-00 12:34','%Y-%m-%d %H:%i') = ''
+0
+Warnings:
+Warning	1292	Truncated incorrect datetime value: ''
+select str_to_date('1','%Y-%m-%d') = '1';
+str_to_date('1','%Y-%m-%d') = '1'
+0
+Warnings:
+Warning	1292	Truncated incorrect date value: '1'
+select str_to_date('1','%Y-%m-%d') = '1';
+str_to_date('1','%Y-%m-%d') = '1'
+0
+Warnings:
+Warning	1292	Truncated incorrect date value: '1'
+select str_to_date('','%Y-%m-%d') = '';
+str_to_date('','%Y-%m-%d') = ''
+0
+Warnings:
+Warning	1292	Truncated incorrect date value: ''
+select str_to_date('1000-01-01','%Y-%m-%d') between '0000-00-00' and NULL;
+str_to_date('1000-01-01','%Y-%m-%d') between '0000-00-00' and NULL
+0
+select str_to_date('1000-01-01','%Y-%m-%d') between NULL and '2000-00-00';
+str_to_date('1000-01-01','%Y-%m-%d') between NULL and '2000-00-00'
+0
+select str_to_date('1000-01-01','%Y-%m-%d') between NULL and NULL;
+str_to_date('1000-01-01','%Y-%m-%d') between NULL and NULL
+0
+CREATE TABLE t1 (c11 INT UNSIGNED NOT NULL AUTO_INCREMENT PRIMARY KEY);
+CREATE TABLE t2 (c21 INT UNSIGNED NOT NULL, 
+c22 INT DEFAULT NULL, 
+KEY(c21, c22));
+CREATE TABLE t3 (c31 INT UNSIGNED NOT NULL DEFAULT 0, 
+c32 INT DEFAULT NULL, 
+c33 INT NOT NULL, 
+c34 INT UNSIGNED DEFAULT 0,
+KEY (c33, c34, c32));
+INSERT INTO t1 values (),(),(),(),();
+INSERT INTO t2 SELECT a.c11, b.c11 FROM t1 a, t1 b;
+INSERT INTO t3 VALUES (1, 1, 1, 0), 
+(2, 2, 0, 0), 
+(3, 3, 1, 0), 
+(4, 4, 0, 0), 
+(5, 5, 1, 0);
+SELECT c32 FROM t1, t2, t3 WHERE t1.c11 IN (1, 3, 5) AND 
+t3.c31 = t1.c11 AND t2.c21 = t1.c11 AND 
+t3.c33 = 1 AND t2.c22 in (1, 3) 
+ORDER BY c32;
+c32
+1
+1
+3
+3
+5
+5
+SELECT c32 FROM t1, t2, t3 WHERE t1.c11 IN (1, 3, 5) AND 
+t3.c31 = t1.c11 AND t2.c21 = t1.c11 AND 
+t3.c33 = 1 AND t2.c22 in (1, 3) 
+ORDER BY c32 DESC;
+c32
+5
+5
+3
+3
+1
+1
+DROP TABLE t1, t2, t3;
+
+#
+# Bug#30736: Row Size Too Large Error Creating a Table and
+# Inserting Data.
+#
+DROP TABLE IF EXISTS t1;
+DROP TABLE IF EXISTS t2;
+
+CREATE TABLE t1(
+c1 DECIMAL(10, 2),
+c2 FLOAT);
+
+INSERT INTO t1 VALUES (0, 1), (2, 3), (4, 5);
+
+CREATE TABLE t2(
+c3 DECIMAL(10, 2))
+SELECT
+c1 * c2 AS c3
+FROM t1;
+
+SELECT * FROM t1;
+c1	c2
+0.00	1
+2.00	3
+4.00	5
+
+SELECT * FROM t2;
+c3
+0.00
+6.00
+20.00
+
+DROP TABLE t1;
+DROP TABLE t2;
+
+CREATE TABLE t1 (c1 BIGINT NOT NULL);
+INSERT INTO t1 (c1) VALUES (1);
+SELECT * FROM t1 WHERE c1 > NULL + 1;
+c1
+DROP TABLE t1;
+
+CREATE TABLE t1 (a VARCHAR(10) NOT NULL PRIMARY KEY);
+INSERT INTO t1 (a) VALUES ('foo0'), ('bar0'), ('baz0');
+SELECT * FROM t1 WHERE a IN (CONCAT('foo', 0), 'bar');
+a
+foo0
+DROP TABLE t1;
+CREATE TABLE t1 (a INT, b INT);
+CREATE TABLE t2 (a INT, c INT, KEY(a));
+INSERT INTO t1 VALUES (1, 1), (2, 2);
+INSERT INTO t2 VALUES (1, 1), (1, 2), (1, 3), (1, 4), (1, 5),
+(2, 1), (2, 2), (2, 3), (2, 4), (2, 5),
+(3, 1), (3, 2), (3, 3), (3, 4), (3, 5),
+(4, 1), (4, 2), (4, 3), (4, 4), (4, 5);
+FLUSH STATUS;
+SELECT DISTINCT b FROM t1 LEFT JOIN t2 USING(a) WHERE c <= 3;
+b
+1
+2
+SHOW STATUS LIKE 'Handler_read%';
+Variable_name	Value
+Handler_read_first	0
+Handler_read_key	2
+Handler_read_next	10
+Handler_read_prev	0
+Handler_read_rnd	10
+Handler_read_rnd_next	7
+DROP TABLE t1, t2;
+CREATE TABLE t1 (f1 bigint(20) NOT NULL default '0',
+f2 int(11) NOT NULL default '0',
+f3 bigint(20) NOT NULL default '0',
+f4 varchar(255) NOT NULL default '',
+PRIMARY KEY (f1),
+KEY key1 (f4),
+KEY key2 (f2));
+CREATE TABLE t2 (f1 int(11) NOT NULL default '0',
+f2 enum('A1','A2','A3') NOT NULL default 'A1',
+f3 int(11) NOT NULL default '0',
+PRIMARY KEY (f1),
+KEY key1 (f3));
+CREATE TABLE t3 (f1 bigint(20) NOT NULL default '0',
+f2 datetime NOT NULL default '1980-01-01 00:00:00',
+PRIMARY KEY (f1));
+insert into t1 values (1, 1, 1, 'abc');
+insert into t1 values (2, 1, 2, 'def');
+insert into t1 values (3, 1, 2, 'def');
+insert into t2 values (1, 'A1', 1);
+insert into t3 values (1, '1980-01-01');
+SELECT a.f3, cr.f4, count(*) count
+FROM t2 a
+STRAIGHT_JOIN t1 cr ON cr.f2 = a.f1
+LEFT JOIN
+(t1 cr2
+JOIN t3 ae2 ON cr2.f3 = ae2.f1
+) ON a.f1 = cr2.f2 AND ae2.f2 < now() - INTERVAL 7 DAY AND
+cr.f4 = cr2.f4
+GROUP BY a.f3, cr.f4;
+f3	f4	count
+1	abc	1
+1	def	2
+drop table t1, t2, t3;
+CREATE TABLE t1 (a INT KEY, b INT);
+INSERT INTO t1 VALUES (1,1), (2,2), (3,3), (4,4);
+EXPLAIN EXTENDED SELECT a, b FROM t1 WHERE a > 1 AND a = b LIMIT 2;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	SIMPLE	t1	range	PRIMARY	PRIMARY	4	NULL	3	100.00	Using index condition; Using where; Using MRR
+Warnings:
+Note	1003	select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b` from `test`.`t1` where ((`test`.`t1`.`b` = `test`.`t1`.`a`) and (`test`.`t1`.`a` > 1)) limit 2
+EXPLAIN EXTENDED SELECT a, b FROM t1 WHERE a > 1 AND b = a LIMIT 2;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	SIMPLE	t1	range	PRIMARY	PRIMARY	4	NULL	3	100.00	Using index condition; Using where; Using MRR
+Warnings:
+Note	1003	select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b` from `test`.`t1` where ((`test`.`t1`.`a` = `test`.`t1`.`b`) and (`test`.`t1`.`a` > 1)) limit 2
+DROP TABLE t1;
+End of 5.0 tests
+create table t1(a INT, KEY (a));
+INSERT INTO t1 VALUES (1),(2),(3),(4),(5);
+SELECT a FROM t1 ORDER BY a LIMIT 2;
+a
+1
+2
+SELECT a FROM t1 ORDER BY a LIMIT 2,4294967296;
+a
+3
+4
+5
+SELECT a FROM t1 ORDER BY a LIMIT 2,4294967297;
+a
+3
+4
+5
+DROP TABLE t1;
+CREATE TABLE A (date_key date);
+CREATE TABLE C (
+pk int,
+int_nokey int,
+int_key int,
+date_key date NOT NULL,
+date_nokey date,
+varchar_key varchar(1)
+);
+INSERT INTO C VALUES 
+(1,1,1,'0000-00-00',NULL,NULL),
+(1,1,1,'0000-00-00',NULL,NULL);
+SELECT 1 FROM C WHERE pk > ANY (SELECT 1 FROM C);
+1
+SELECT COUNT(DISTINCT 1) FROM C 
+WHERE date_key = (SELECT 1 FROM A WHERE C.date_key IS NULL) GROUP BY pk;
+COUNT(DISTINCT 1)
+SELECT date_nokey FROM C 
+WHERE int_key IN (SELECT 1 FROM A) 
+HAVING date_nokey = '10:41:7' 
+ORDER BY date_key;
+date_nokey
+Warnings:
+Warning	1292	Incorrect date value: '10:41:7' for column 'date_nokey' at row 1
+DROP TABLE A,C;
+CREATE TABLE t1 (a INT NOT NULL, b INT);
+INSERT INTO t1 VALUES (1, 1);
+EXPLAIN EXTENDED SELECT * FROM t1 WHERE (a=a AND a=a) OR b > 2;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	SIMPLE	t1	system	NULL	NULL	NULL	NULL	1	100.00	
+Warnings:
+Note	1003	select '1' AS `a`,'1' AS `b` from `test`.`t1` where 1
+SELECT * FROM t1 WHERE (a=a AND a=a) OR b > 2;
+a	b
+1	1
+DROP TABLE t1;
+CREATE TABLE t1 (a INT NOT NULL, b INT NOT NULL, c INT NOT NULL);
+EXPLAIN EXTENDED SELECT * FROM t1 WHERE (a=a AND b=b AND c=c) OR b > 20;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	SIMPLE	t1	system	NULL	NULL	NULL	NULL	0	0.00	const row not found
+Warnings:
+Note	1003	select '0' AS `a`,'0' AS `b`,'0' AS `c` from `test`.`t1` where 1
+EXPLAIN EXTENDED SELECT * FROM t1 WHERE (a=a AND a=a AND b=b) OR b > 20;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	SIMPLE	t1	system	NULL	NULL	NULL	NULL	0	0.00	const row not found
+Warnings:
+Note	1003	select '0' AS `a`,'0' AS `b`,'0' AS `c` from `test`.`t1` where 1
+EXPLAIN EXTENDED SELECT * FROM t1 WHERE (a=a AND b=b AND a=a) OR b > 20;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	SIMPLE	t1	system	NULL	NULL	NULL	NULL	0	0.00	const row not found
+Warnings:
+Note	1003	select '0' AS `a`,'0' AS `b`,'0' AS `c` from `test`.`t1` where 1
+DROP TABLE t1;
+#
+# Bug#45266: Uninitialized variable lead to an empty result.
+#
+drop table if exists A,AA,B,BB;
+CREATE TABLE `A` (
+`pk` int(11) NOT NULL AUTO_INCREMENT,
+`date_key` date NOT NULL,
+`date_nokey` date NOT NULL,
+`datetime_key` datetime NOT NULL,
+`int_nokey` int(11) NOT NULL,
+`time_key` time NOT NULL,
+`time_nokey` time NOT NULL,
+PRIMARY KEY (`pk`),
+KEY `date_key` (`date_key`),
+KEY `time_key` (`time_key`),
+KEY `datetime_key` (`datetime_key`)
+);
+CREATE TABLE `AA` (
+`pk` int(11) NOT NULL AUTO_INCREMENT,
+`int_nokey` int(11) NOT NULL,
+`time_key` time NOT NULL,
+KEY `time_key` (`time_key`),
+PRIMARY KEY (`pk`)
+);
+CREATE TABLE `B` (
+`date_nokey` date NOT NULL,
+`date_key` date NOT NULL,
+`time_key` time NOT NULL,
+`datetime_nokey` datetime NOT NULL,
+`varchar_key` varchar(1) NOT NULL,
+KEY `date_key` (`date_key`),
+KEY `time_key` (`time_key`),
+KEY `varchar_key` (`varchar_key`)
+);
+INSERT INTO `B` VALUES ('2003-07-28','2003-07-28','15:13:38','0000-00-00 00:00:00','f'),('0000-00-00','0000-00-00','00:05:48','2004-07-02 14:34:13','x');
+CREATE TABLE `BB` (
+`pk` int(11) NOT NULL AUTO_INCREMENT,
+`int_nokey` int(11) NOT NULL,
+`date_key` date NOT NULL,
+`varchar_nokey` varchar(1) NOT NULL,
+`date_nokey` date NOT NULL,
+PRIMARY KEY (`pk`),
+KEY `date_key` (`date_key`)
+);
+INSERT INTO `BB` VALUES (10,8,'0000-00-00','i','0000-00-00'),(11,0,'2005-08-18','','2005-08-18');
+SELECT table1 . `pk` AS field1 
+FROM 
+(BB AS table1 INNER JOIN 
+(AA AS table2 STRAIGHT_JOIN A AS table3 
+ON ( table3 . `date_key` = table2 . `pk` ))
+ON ( table3 . `datetime_key` = table2 . `int_nokey` ))
+WHERE  ( table3 . `date_key` <= 4 AND table2 . `pk` = table1 . `varchar_nokey`)
+GROUP BY field1 ;
+field1
+SELECT table3 .`date_key` field1
+FROM
+B table1 LEFT JOIN B table3 JOIN
+(BB table6 JOIN A table7 ON table6 .`varchar_nokey`)
+ON table6 .`int_nokey` ON table6 .`date_key`
+  WHERE  NOT ( table1 .`varchar_key`  AND table7 .`pk`) GROUP  BY field1;
+field1
+NULL
+SELECT table4 . `time_nokey` AS field1 FROM 
+(AA AS table1 CROSS JOIN 
+(AA AS table2 STRAIGHT_JOIN 
+(B AS table3 STRAIGHT_JOIN A AS table4 
+ON ( table4 . `date_key` = table3 . `time_key` ))
+ON ( table4 . `pk` = table3 . `date_nokey` ))
+ON ( table4 . `time_key` = table3 . `datetime_nokey` ))
+WHERE  ( table4 . `time_key` < table1 . `time_key` AND
+table1 . `int_nokey` != 'f')
+GROUP BY field1  ORDER BY field1 , field1;
+field1
+SELECT table1 .`time_key` field2  FROM B table1  LEFT JOIN  BB JOIN A table5 ON table5 .`date_nokey`  ON table5 .`int_nokey` GROUP  BY field2;
+field2
+00:05:48
+15:13:38
+drop table A,AA,B,BB;
+#end of test for bug#45266
+End of 5.1 tests
+set join_cache_level=default;
+show variables like 'join_cache_level';
+Variable_name	Value
+join_cache_level	1

=== modified file 'mysql-test/r/table_elim.result'
--- a/mysql-test/r/table_elim.result	2009-12-15 07:16:46 +0000
+++ b/mysql-test/r/table_elim.result	2009-12-21 02:26:15 +0000
@@ -347,7 +347,7 @@ id	select_type	table	type	possible_keys	
 explain select t1.a from t1 left join t2 on TRUE;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	4	
-1	SIMPLE	t2	index	NULL	PRIMARY	4	NULL	2	Using index
+1	SIMPLE	t2	index	NULL	PRIMARY	4	NULL	2	Using where; Using index
 explain select t1.a from t1 left join t3 on t3.pk1=t1.a and t3.pk2 IS NULL;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	4	

=== added file 'mysql-test/t/join_cache.test'
--- a/mysql-test/t/join_cache.test	1970-01-01 00:00:00 +0000
+++ b/mysql-test/t/join_cache.test	2009-12-21 02:26:15 +0000
@@ -0,0 +1,1825 @@
+--disable_warnings
+DROP TABLE IF EXISTS t1,t2,t3,t4,t5,t6,t7,t8,t9,t10,t11;
+DROP DATABASE IF EXISTS world;
+--enable_warnings
+
+set names utf8;
+
+CREATE DATABASE world;
+
+use world;
+
+--source include/world_schema1.inc
+
+--disable_query_log
+--disable_result_log
+--disable_warnings
+--source include/world.inc
+--enable_warnings
+--enable_result_log
+--enable_query_log
+
+SELECT COUNT(*) FROM Country;
+SELECT COUNT(*) FROM City;
+SELECT COUNT(*) FROM CountryLanguage;
+
+show variables like 'join_buffer_size';
+
+show variables like 'join_cache_level';
+
+EXPLAIN
+SELECT City.Name, Country.Name FROM City,Country
+  WHERE City.Country=Country.Code AND 
+        Country.Name LIKE 'L%' AND City.Population > 100000;
+
+SELECT City.Name, Country.Name FROM City,Country
+  WHERE City.Country=Country.Code AND 
+        Country.Name LIKE 'L%' AND City.Population > 100000;
+
+EXPLAIN
+SELECT City.Name, Country.Name, CountryLanguage.Language
+  FROM City,Country,CountryLanguage
+  WHERE City.Country=Country.Code AND
+        CountryLanguage.Country=Country.Code AND
+        City.Name LIKE 'L%' AND Country.Population > 3000000 AND
+        CountryLanguage.Percentage > 50;
+
+SELECT City.Name, Country.Name, CountryLanguage.Language
+  FROM City,Country,CountryLanguage
+  WHERE City.Country=Country.Code AND
+        CountryLanguage.Country=Country.Code AND
+        City.Name LIKE 'L%' AND Country.Population > 3000000 AND
+        CountryLanguage.Percentage > 50;
+
+set join_cache_level=2;
+show variables like 'join_cache_level';
+
+EXPLAIN
+SELECT City.Name, Country.Name FROM City,Country
+  WHERE City.Country=Country.Code AND 
+        Country.Name LIKE 'L%' AND City.Population > 100000;
+
+SELECT City.Name, Country.Name FROM City,Country
+  WHERE City.Country=Country.Code AND 
+        Country.Name LIKE 'L%' AND City.Population > 100000;
+
+EXPLAIN
+SELECT City.Name, Country.Name, CountryLanguage.Language
+  FROM City,Country,CountryLanguage
+  WHERE City.Country=Country.Code AND
+        CountryLanguage.Country=Country.Code AND
+        City.Name LIKE 'L%' AND Country.Population > 3000000 AND
+        CountryLanguage.Percentage > 50;
+
+SELECT City.Name, Country.Name, CountryLanguage.Language
+  FROM City,Country,CountryLanguage
+  WHERE City.Country=Country.Code AND
+        CountryLanguage.Country=Country.Code AND
+        City.Name LIKE 'L%' AND Country.Population > 3000000 AND
+        CountryLanguage.Percentage > 50;
+
+set join_cache_level=default;
+
+set join_buffer_size=256;
+show variables like 'join_buffer_size';
+
+show variables like 'join_cache_level';
+
+EXPLAIN
+SELECT City.Name, Country.Name FROM City,Country
+  WHERE City.Country=Country.Code AND 
+        Country.Name LIKE 'L%' AND City.Population > 100000;
+
+SELECT City.Name, Country.Name FROM City,Country
+  WHERE City.Country=Country.Code AND 
+        Country.Name LIKE 'L%' AND City.Population > 100000;
+
+EXPLAIN
+SELECT City.Name, Country.Name, CountryLanguage.Language
+  FROM City,Country,CountryLanguage
+  WHERE City.Country=Country.Code AND
+        CountryLanguage.Country=Country.Code AND
+        City.Name LIKE 'L%' AND Country.Population > 3000000 AND
+        CountryLanguage.Percentage > 50;
+
+SELECT City.Name, Country.Name, CountryLanguage.Language
+  FROM City,Country,CountryLanguage
+  WHERE City.Country=Country.Code AND
+        CountryLanguage.Country=Country.Code AND
+        City.Name LIKE 'L%' AND Country.Population > 3000000 AND
+        CountryLanguage.Percentage > 50;
+
+set join_cache_level=2;
+show variables like 'join_cache_level';
+
+EXPLAIN
+SELECT City.Name, Country.Name FROM City,Country
+  WHERE City.Country=Country.Code AND 
+        Country.Name LIKE 'L%' AND City.Population > 100000;
+
+SELECT City.Name, Country.Name FROM City,Country
+  WHERE City.Country=Country.Code AND 
+        Country.Name LIKE 'L%' AND City.Population > 100000;
+
+EXPLAIN
+SELECT City.Name, Country.Name, CountryLanguage.Language
+  FROM City,Country,CountryLanguage
+  WHERE City.Country=Country.Code AND
+        CountryLanguage.Country=Country.Code AND
+        City.Name LIKE 'L%' AND Country.Population > 3000000 AND
+        CountryLanguage.Percentage > 50;
+
+SELECT City.Name, Country.Name, CountryLanguage.Language
+  FROM City,Country,CountryLanguage
+  WHERE City.Country=Country.Code AND
+        CountryLanguage.Country=Country.Code AND
+        City.Name LIKE 'L%' AND Country.Population > 3000000 AND
+        CountryLanguage.Percentage > 50;
+
+set join_cache_level=default;
+set join_buffer_size=default;
+
+show variables like 'join_buffer_size';
+show variables like 'join_cache_level';
+
+DROP DATABASE world; 
+
+
+CREATE DATABASE world;
+
+use world;
+
+--source include/world_schema.inc
+
+--disable_query_log
+--disable_result_log
+--disable_warnings
+--source include/world.inc
+--enable_warnings
+--enable_result_log
+--enable_query_log
+
+show variables like 'join_buffer_size';
+set join_cache_level=5;
+show variables like 'join_cache_level';
+
+EXPLAIN
+SELECT City.Name, Country.Name FROM City,Country
+  WHERE City.Country=Country.Code AND 
+        Country.Name LIKE 'L%' AND City.Population > 100000;
+
+SELECT City.Name, Country.Name FROM City,Country
+  WHERE City.Country=Country.Code AND 
+        Country.Name LIKE 'L%' AND City.Population > 100000;
+
+EXPLAIN
+SELECT City.Name, Country.Name, CountryLanguage.Language
+  FROM City,Country,CountryLanguage
+  WHERE City.Country=Country.Code AND
+        CountryLanguage.Country=Country.Code AND
+        City.Name LIKE 'L%' AND Country.Population > 3000000 AND
+        CountryLanguage.Percentage > 50;
+
+SELECT City.Name, Country.Name, CountryLanguage.Language
+  FROM City,Country,CountryLanguage
+  WHERE City.Country=Country.Code AND
+        CountryLanguage.Country=Country.Code AND
+        City.Name LIKE 'L%' AND Country.Population > 3000000 AND
+        CountryLanguage.Percentage > 50;
+
+--echo # !!!NB igor: after backporting the SJ code the following should return
+--echo # EXPLAIN
+--echo # SELECT Name FROM City
+--echo # WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
+--echo # City.Population > 100000;
+--echo # id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+--echo # 1	PRIMARY	Country	range	PRIMARY,Name	Name	52	NULL	10	Using index condition; Using MRR
+--echo # 1	PRIMARY	City	ref	Population,Country	Country	3	world.Country.Code	18	Using where; Using join buffer
+
+EXPLAIN
+SELECT Name FROM City
+  WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
+        City.Population > 100000;
+
+SELECT Name FROM City
+  WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
+        City.Population > 100000;
+
+EXPLAIN
+SELECT Country.Name, IF(ISNULL(CountryLanguage.Country), NULL, CountryLanguage.Percentage)
+  FROM Country LEFT JOIN CountryLanguage ON
+       (CountryLanguage.Country=Country.Code AND Language='English')
+  WHERE 
+       Country.Population > 10000000;
+
+SELECT Country.Name, IF(ISNULL(CountryLanguage.Country), NULL, CountryLanguage.Percentage)
+  FROM Country LEFT JOIN CountryLanguage ON
+       (CountryLanguage.Country=Country.Code AND Language='English')
+  WHERE 
+       Country.Population > 10000000;
+
+set join_cache_level=6;
+show variables like 'join_cache_level';
+
+EXPLAIN
+SELECT City.Name, Country.Name FROM City,Country
+  WHERE City.Country=Country.Code AND 
+        Country.Name LIKE 'L%' AND City.Population > 100000;
+
+SELECT City.Name, Country.Name FROM City,Country
+  WHERE City.Country=Country.Code AND 
+        Country.Name LIKE 'L%' AND City.Population > 100000;
+
+EXPLAIN
+SELECT City.Name, Country.Name, CountryLanguage.Language
+  FROM City,Country,CountryLanguage
+  WHERE City.Country=Country.Code AND
+        CountryLanguage.Country=Country.Code AND
+        City.Name LIKE 'L%' AND Country.Population > 3000000 AND
+        CountryLanguage.Percentage > 50;
+
+SELECT City.Name, Country.Name, CountryLanguage.Language
+  FROM City,Country,CountryLanguage
+  WHERE City.Country=Country.Code AND
+        CountryLanguage.Country=Country.Code AND
+        City.Name LIKE 'L%' AND Country.Population > 3000000 AND
+        CountryLanguage.Percentage > 50;
+
+--echo # !!!NB igor: after backporting the SJ code the following should return
+--echo # EXPLAIN
+--echo # SELECT Name FROM City
+--echo # WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
+--echo # City.Population > 100000;
+--echo # id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+--echo # 1	PRIMARY	Country	range	PRIMARY,Name	Name	52	NULL	10	Using index condition; Using MRR
+--echo # 1	PRIMARY	City	ref	Population,Country	Country	3	world.Country.Code	18	Using where; Using join buffer
+
+EXPLAIN
+SELECT Name FROM City
+  WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
+        City.Population > 100000;
+
+SELECT Name FROM City
+  WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
+        City.Population > 100000;
+
+EXPLAIN
+SELECT Country.Name, IF(ISNULL(CountryLanguage.Country), NULL, CountryLanguage.Percentage)
+  FROM Country LEFT JOIN CountryLanguage ON
+       (CountryLanguage.Country=Country.Code AND Language='English')
+  WHERE 
+       Country.Population > 10000000;
+
+SELECT Country.Name, IF(ISNULL(CountryLanguage.Country), NULL, CountryLanguage.Percentage)
+  FROM Country LEFT JOIN CountryLanguage ON
+       (CountryLanguage.Country=Country.Code AND Language='English')
+  WHERE 
+       Country.Population > 10000000;
+
+set join_cache_level=7;
+show variables like 'join_cache_level';
+
+EXPLAIN
+SELECT City.Name, Country.Name FROM City,Country
+  WHERE City.Country=Country.Code AND 
+        Country.Name LIKE 'L%' AND City.Population > 100000;
+
+SELECT City.Name, Country.Name FROM City,Country
+  WHERE City.Country=Country.Code AND 
+        Country.Name LIKE 'L%' AND City.Population > 100000;
+
+EXPLAIN
+SELECT City.Name, Country.Name, CountryLanguage.Language
+  FROM City,Country,CountryLanguage
+  WHERE City.Country=Country.Code AND
+        CountryLanguage.Country=Country.Code AND
+        City.Name LIKE 'L%' AND Country.Population > 3000000 AND
+        CountryLanguage.Percentage > 50;
+
+SELECT City.Name, Country.Name, CountryLanguage.Language
+  FROM City,Country,CountryLanguage
+  WHERE City.Country=Country.Code AND
+        CountryLanguage.Country=Country.Code AND
+        City.Name LIKE 'L%' AND Country.Population > 3000000 AND
+        CountryLanguage.Percentage > 50;
+
+--echo # !!!NB igor: after backporting the SJ code the following should return
+--echo # EXPLAIN
+--echo # SELECT Name FROM City
+--echo # WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
+--echo # City.Population > 100000;
+--echo # id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+--echo # 1	PRIMARY	Country	range	PRIMARY,Name	Name	52	NULL	10	Using index condition; Using MRR
+--echo # 1	PRIMARY	City	ref	Population,Country	Country	3	world.Country.Code	18	Using where; Using join buffer
+
+EXPLAIN
+SELECT Name FROM City
+  WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
+        City.Population > 100000;
+
+SELECT Name FROM City
+  WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
+        City.Population > 100000;
+
+EXPLAIN
+SELECT Country.Name, IF(ISNULL(CountryLanguage.Country), NULL, CountryLanguage.Percentage)
+  FROM Country LEFT JOIN CountryLanguage ON
+       (CountryLanguage.Country=Country.Code AND Language='English')
+  WHERE 
+       Country.Population > 10000000;
+
+SELECT Country.Name, IF(ISNULL(CountryLanguage.Country), NULL, CountryLanguage.Percentage)
+  FROM Country LEFT JOIN CountryLanguage ON
+       (CountryLanguage.Country=Country.Code AND Language='English')
+  WHERE 
+       Country.Population > 10000000;
+
+set join_cache_level=8;
+show variables like 'join_cache_level';
+
+EXPLAIN
+SELECT City.Name, Country.Name FROM City,Country
+  WHERE City.Country=Country.Code AND 
+        Country.Name LIKE 'L%' AND City.Population > 100000;
+
+SELECT City.Name, Country.Name FROM City,Country
+  WHERE City.Country=Country.Code AND 
+        Country.Name LIKE 'L%' AND City.Population > 100000;
+
+EXPLAIN
+SELECT City.Name, Country.Name, CountryLanguage.Language
+  FROM City,Country,CountryLanguage
+  WHERE City.Country=Country.Code AND
+        CountryLanguage.Country=Country.Code AND
+        City.Name LIKE 'L%' AND Country.Population > 3000000 AND
+        CountryLanguage.Percentage > 50;
+
+SELECT City.Name, Country.Name, CountryLanguage.Language
+  FROM City,Country,CountryLanguage
+  WHERE City.Country=Country.Code AND
+        CountryLanguage.Country=Country.Code AND
+        City.Name LIKE 'L%' AND Country.Population > 3000000 AND
+        CountryLanguage.Percentage > 50;
+
+--echo # !!!NB igor: after backporting the SJ code the following should return
+--echo # EXPLAIN
+--echo # SELECT Name FROM City
+--echo # WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
+--echo # City.Population > 100000;
+--echo # id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+--echo # 1	PRIMARY	Country	range	PRIMARY,Name	Name	52	NULL	10	Using index condition; Using MRR
+--echo # 1	PRIMARY	City	ref	Population,Country	Country	3	world.Country.Code	18	Using where; Using join buffer
+
+EXPLAIN
+SELECT Name FROM City
+  WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
+        City.Population > 100000;
+
+SELECT Name FROM City
+  WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
+        City.Population > 100000;
+
+EXPLAIN
+SELECT Country.Name, IF(ISNULL(CountryLanguage.Country), NULL, CountryLanguage.Percentage)
+  FROM Country LEFT JOIN CountryLanguage ON
+       (CountryLanguage.Country=Country.Code AND Language='English')
+  WHERE 
+       Country.Population > 10000000;
+
+SELECT Country.Name, IF(ISNULL(CountryLanguage.Country), NULL, CountryLanguage.Percentage)
+  FROM Country LEFT JOIN CountryLanguage ON
+       (CountryLanguage.Country=Country.Code AND Language='English')
+  WHERE 
+       Country.Population > 10000000;
+
+set join_buffer_size=256;
+show variables like 'join_buffer_size';
+
+set join_cache_level=5;
+show variables like 'join_cache_level';
+
+EXPLAIN
+SELECT City.Name, Country.Name FROM City,Country
+  WHERE City.Country=Country.Code AND 
+        Country.Name LIKE 'L%' AND City.Population > 100000;
+
+SELECT City.Name, Country.Name FROM City,Country
+  WHERE City.Country=Country.Code AND 
+        Country.Name LIKE 'L%' AND City.Population > 100000;
+
+EXPLAIN
+SELECT City.Name, Country.Name, CountryLanguage.Language
+  FROM City,Country,CountryLanguage
+  WHERE City.Country=Country.Code AND
+        CountryLanguage.Country=Country.Code AND
+        City.Name LIKE 'L%' AND Country.Population > 3000000 AND
+        CountryLanguage.Percentage > 50;
+
+SELECT City.Name, Country.Name, CountryLanguage.Language
+  FROM City,Country,CountryLanguage
+  WHERE City.Country=Country.Code AND
+        CountryLanguage.Country=Country.Code AND
+        City.Name LIKE 'L%' AND Country.Population > 3000000 AND
+        CountryLanguage.Percentage > 50;
+
+--echo # !!!NB igor: after backporting the SJ code the following should return
+--echo # EXPLAIN
+--echo # SELECT Name FROM City
+--echo # WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
+--echo # City.Population > 100000;
+--echo # id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+--echo # 1	PRIMARY	Country	range	PRIMARY,Name	Name	52	NULL	10	Using index condition; Using MRR
+--echo # 1	PRIMARY	City	ref	Population,Country	Country	3	world.Country.Code	18	Using where; Using join buffer
+
+EXPLAIN
+SELECT Name FROM City
+  WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
+        City.Population > 100000;
+
+SELECT Name FROM City
+  WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
+        City.Population > 100000;
+
+set join_cache_level=6;
+show variables like 'join_cache_level';
+
+EXPLAIN
+SELECT City.Name, Country.Name FROM City,Country
+  WHERE City.Country=Country.Code AND 
+        Country.Name LIKE 'L%' AND City.Population > 100000;
+
+SELECT City.Name, Country.Name FROM City,Country
+  WHERE City.Country=Country.Code AND 
+        Country.Name LIKE 'L%' AND City.Population > 100000;
+
+EXPLAIN
+SELECT City.Name, Country.Name, CountryLanguage.Language
+  FROM City,Country,CountryLanguage
+  WHERE City.Country=Country.Code AND
+        CountryLanguage.Country=Country.Code AND
+        City.Name LIKE 'L%' AND Country.Population > 3000000 AND
+        CountryLanguage.Percentage > 50;
+
+SELECT City.Name, Country.Name, CountryLanguage.Language
+  FROM City,Country,CountryLanguage
+  WHERE City.Country=Country.Code AND
+        CountryLanguage.Country=Country.Code AND
+        City.Name LIKE 'L%' AND Country.Population > 3000000 AND
+        CountryLanguage.Percentage > 50;
+
+--echo # !!!NB igor: after backporting the SJ code the following should return
+--echo # EXPLAIN
+--echo # SELECT Name FROM City
+--echo # WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
+--echo # City.Population > 100000;
+--echo # id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+--echo # 1	PRIMARY	Country	range	PRIMARY,Name	Name	52	NULL	10	Using index condition; Using MRR
+--echo # 1	PRIMARY	City	ref	Population,Country	Country	3	world.Country.Code	18	Using where; Using join buffer
+
+EXPLAIN
+SELECT Name FROM City
+  WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
+        City.Population > 100000;
+
+SELECT Name FROM City
+  WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
+        City.Population > 100000;
+
+set join_cache_level=7;
+show variables like 'join_cache_level';
+
+EXPLAIN
+SELECT City.Name, Country.Name FROM City,Country
+  WHERE City.Country=Country.Code AND 
+        Country.Name LIKE 'L%' AND City.Population > 100000;
+
+SELECT City.Name, Country.Name FROM City,Country
+  WHERE City.Country=Country.Code AND 
+        Country.Name LIKE 'L%' AND City.Population > 100000;
+
+EXPLAIN
+SELECT City.Name, Country.Name, CountryLanguage.Language
+  FROM City,Country,CountryLanguage
+  WHERE City.Country=Country.Code AND
+        CountryLanguage.Country=Country.Code AND
+        City.Name LIKE 'L%' AND Country.Population > 3000000 AND
+        CountryLanguage.Percentage > 50;
+
+SELECT City.Name, Country.Name, CountryLanguage.Language
+  FROM City,Country,CountryLanguage
+  WHERE City.Country=Country.Code AND
+        CountryLanguage.Country=Country.Code AND
+        City.Name LIKE 'L%' AND Country.Population > 3000000 AND
+        CountryLanguage.Percentage > 50;
+
+--echo # !!!NB igor: after backporting the SJ code the following should return
+--echo # EXPLAIN
+--echo # SELECT Name FROM City
+--echo # WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
+--echo # City.Population > 100000;
+--echo # id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+--echo # 1	PRIMARY	Country	range	PRIMARY,Name	Name	52	NULL	10	Using index condition; Using MRR
+--echo # 1	PRIMARY	City	ref	Population,Country	Country	3	world.Country.Code	18	Using where; Using join buffer
+
+EXPLAIN
+SELECT Name FROM City
+  WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
+        City.Population > 100000;
+
+SELECT Name FROM City
+  WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
+        City.Population > 100000;
+
+set join_cache_level=8;
+show variables like 'join_cache_level';
+
+EXPLAIN
+SELECT City.Name, Country.Name FROM City,Country
+  WHERE City.Country=Country.Code AND 
+        Country.Name LIKE 'L%' AND City.Population > 100000;
+
+SELECT City.Name, Country.Name FROM City,Country
+  WHERE City.Country=Country.Code AND 
+        Country.Name LIKE 'L%' AND City.Population > 100000;
+
+EXPLAIN
+SELECT City.Name, Country.Name, CountryLanguage.Language
+  FROM City,Country,CountryLanguage
+  WHERE City.Country=Country.Code AND
+        CountryLanguage.Country=Country.Code AND
+        City.Name LIKE 'L%' AND Country.Population > 3000000 AND
+        CountryLanguage.Percentage > 50;
+
+SELECT City.Name, Country.Name, CountryLanguage.Language
+  FROM City,Country,CountryLanguage
+  WHERE City.Country=Country.Code AND
+        CountryLanguage.Country=Country.Code AND
+        City.Name LIKE 'L%' AND Country.Population > 3000000 AND
+        CountryLanguage.Percentage > 50;
+
+--echo # !!!NB igor: after backporting the SJ code the following should return
+--echo # EXPLAIN
+--echo # SELECT Name FROM City
+--echo # WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
+--echo # City.Population > 100000;
+--echo # id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+--echo # 1	PRIMARY	Country	range	PRIMARY,Name	Name	52	NULL	10	Using index condition; Using MRR
+--echo # 1	PRIMARY	City	ref	Population,Country	Country	3	world.Country.Code	18	Using where; Using join buffer
+
+EXPLAIN
+SELECT Name FROM City
+  WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
+        City.Population > 100000;
+
+SELECT Name FROM City
+  WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
+        City.Population > 100000;
+
+set join_cache_level=default;
+set join_buffer_size=default;
+
+show variables like 'join_buffer_size';
+show variables like 'join_cache_level';
+
+set join_cache_level=1;
+
+SELECT City.Name, Country.Name FROM City,Country
+  WHERE City.Country=Country.Code AND City.Population > 3000000;
+
+set join_cache_level=8;
+set join_buffer_size=256;
+
+--replace_column 9 #
+EXPLAIN
+SELECT City.Name, Country.Name FROM City,Country
+  WHERE City.Country=Country.Code AND City.Population > 3000000;
+
+SELECT City.Name, Country.Name FROM City,Country
+  WHERE City.Country=Country.Code AND City.Population > 3000000;
+
+set join_buffer_size=default;
+
+set join_cache_level=6;
+
+ALTER TABLE Country MODIFY Name varchar(52) NOT NULL default '';
+
+SELECT City.Name, Country.Name FROM City,Country
+  WHERE City.Country=Country.Code AND 
+        Country.Name LIKE 'L%' AND City.Population > 100000;
+
+ALTER TABLE Country MODIFY Name varchar(300) NOT NULL default '';
+
+SELECT City.Name, Country.Name FROM City,Country
+  WHERE City.Country=Country.Code AND 
+        Country.Name LIKE 'L%' AND City.Population > 100000;
+
+ALTER TABLE Country ADD COLUMN PopulationBar text;
+UPDATE Country 
+  SET PopulationBar=REPEAT('x', CAST(Population/100000 AS unsigned int));
+
+SELECT City.Name, Country.Name, Country.PopulationBar FROM City,Country
+  WHERE City.Country=Country.Code AND 
+        Country.Name LIKE 'L%' AND City.Population > 100000;
+
+set join_buffer_size=256;
+
+SELECT City.Name, Country.Name, Country.PopulationBar FROM City,Country
+  WHERE City.Country=Country.Code AND 
+        Country.Name LIKE 'L%' AND City.Population > 100000;
+
+set join_cache_level=default;
+set join_buffer_size=default;
+
+DROP DATABASE world;
+
+use test;
+
+#
+# Bug #35685: assertion abort when initializing a BKA cache
+#
+
+CREATE TABLE t1(
+  affiliatetometaid int  NOT NULL default '0',
+  uniquekey int NOT NULL default '0',
+  metaid int  NOT NULL default '0',
+  affiliateid int  NOT NULL default '0',
+  xml text,
+  isactive char(1) NOT NULL default 'Y',
+  PRIMARY KEY  (affiliatetometaid)
+);
+CREATE UNIQUE INDEX t1_uniquekey ON t1(uniquekey);
+CREATE INDEX t1_affiliateid ON t1(affiliateid);
+CREATE INDEX t1_metaid on t1 (metaid);
+INSERT INTO t1 VALUES
+  (1616, 1571693233, 1391, 2, NULL, 'Y'), (1943, 1993216749, 1726, 2, NULL, 'Y');
+
+CREATE TABLE t2(
+  metaid int  NOT NULL default '0',
+  name varchar(80) NOT NULL default '',
+  dateadded timestamp NOT NULL ,
+  xml text,
+  status int default NULL,
+  origin int default NULL,
+  gid int NOT NULL default '1',
+  formattypeid int  default NULL,
+  PRIMARY KEY  (metaid)
+);
+CREATE INDEX t2_status ON t2(status);
+CREATE INDEX t2_gid ON t2(gid);
+CREATE INDEX t2_formattypeid ON t2(formattypeid);
+INSERT INTO t2 VALUES
+ (1391, "I Just Died", "2003-10-02 10:07:37", "", 1, NULL, 3, NULL),
+ (1726, "Me, Myself & I", "2003-12-05 11:24:36", " ", 1, NULL, 3, NULL);
+
+CREATE TABLE t3(
+  mediaid int  NOT NULL ,
+  metaid int  NOT NULL default '0',
+  formatid int  NOT NULL default '0',
+  status int default NULL,
+  path varchar(100) NOT NULL default '',
+  datemodified timestamp NOT NULL ,
+  resourcetype int  NOT NULL default '1',
+  parameters text,
+  signature int  default NULL,
+  quality int  NOT NULL default '255',
+  PRIMARY KEY  (mediaid)
+);
+CREATE INDEX t3_metaid ON t3(metaid);
+CREATE INDEX t3_formatid ON t3(formatid);
+CREATE INDEX t3_status ON t3(status);
+CREATE INDEX t3_metaidformatid ON t3(metaid,formatid);
+CREATE INDEX t3_signature ON t3(signature);
+CREATE INDEX t3_quality ON t3(quality);
+INSERT INTO t3 VALUES
+  (6, 4, 8, 0, "010101_anastacia_spmidi.mid", "2004-03-16 13:40:00", 1, NULL, NULL, 255),
+  (3343, 3, 8, 1, "010102_4VN4bsPwnxRQUJW5Zp1RhG2IL9vvl_8.mid", "2004-03-16 13:40:00", 1, NULL, NULL, 255);
+
+CREATE TABLE t4(
+  formatid int  NOT NULL ,
+  name varchar(60) NOT NULL default '',
+  formatclassid int  NOT NULL default '0',
+  mime varchar(60) default NULL,
+  extension varchar(10) default NULL,
+  priority int NOT NULL default '0',
+  canaddtocapability char(1) NOT NULL default 'Y',
+  PRIMARY KEY  (formatid)
+);
+CREATE INDEX t4_formatclassid ON t4(formatclassid);
+CREATE INDEX t4_formats_idx ON t4(canaddtocapability);
+INSERT INTO t4 VALUES
+  (19, "XHTML", 11, "text/html", "xhtml", 10, 'Y'),
+  (54, "AMR (wide band)", 13, "audio/amr-wb", "awb", 0, 'Y');
+
+CREATE TABLE t5(
+  formatclassid int  NOT NULL ,
+  name varchar(60) NOT NULL default '',
+  priority int NOT NULL default '0',
+  formattypeid int  NOT NULL default '0',
+  PRIMARY KEY  (formatclassid)
+);
+CREATE INDEX t5_formattypeid on t5(formattypeid);
+INSERT INTO t5 VALUES
+  (11, "Info", 0, 4), (13, "Digital Audio", 0, 2);
+
+CREATE TABLE t6(
+  formattypeid int  NOT NULL ,
+  name varchar(60) NOT NULL default '',
+  priority int default NULL,
+  PRIMARY KEY  (formattypeid)
+);
+INSERT INTO t6 VALUES
+ (2, "Ringtones", 0);
+
+CREATE TABLE t7(
+  metaid int  NOT NULL default '0',
+  artistid int  NOT NULL default '0',
+  PRIMARY KEY  (metaid,artistid)
+);
+INSERT INTO t7 VALUES
+  (4, 5), (3, 4);
+
+CREATE TABLE t8(
+  artistid int  NOT NULL ,
+  name varchar(80) NOT NULL default '',
+  PRIMARY KEY  (artistid)
+);
+INSERT INTO t8 VALUES
+  (5, "Anastacia"), (4, "John Mayer");
+
+CREATE TABLE t9(
+  subgenreid int  NOT NULL default '0',
+  metaid int  NOT NULL default '0',
+  PRIMARY KEY  (subgenreid,metaid)
+) ;
+CREATE INDEX t9_subgenreid ON t9(subgenreid);
+CREATE INDEX t9_metaid ON t9(metaid);
+INSERT INTO t9 VALUES 
+  (138, 4), (31, 3);
+
+CREATE TABLE t10(
+  subgenreid int  NOT NULL ,
+  genreid int  NOT NULL default '0',
+  name varchar(80) NOT NULL default '',
+  PRIMARY KEY  (subgenreid)
+) ;
+CREATE INDEX t10_genreid ON t10(genreid);
+INSERT INTO t10 VALUES 
+  (138, 19, ''), (31, 3, '');
+
+CREATE TABLE t11(
+  genreid int  NOT NULL default '0',
+  name char(80) NOT NULL default '',
+  priority int NOT NULL default '0',
+  masterclip char(1) default NULL,
+  PRIMARY KEY  (genreid)
+) ;
+CREATE INDEX t11_masterclip ON t11( masterclip);
+INSERT INTO t11 VALUES
+  (19, "Pop & Dance", 95, 'Y'), (3, "Rock & Alternative", 100, 'Y');
+
+set join_cache_level=6;
+
+EXPLAIN
+SELECT t1.uniquekey, t1.xml AS affiliateXml,
+       t8.name AS artistName, t8.artistid, 
+       t11.name AS genreName, t11.genreid, t11.priority AS genrePriority,
+       t10.subgenreid, t10.name AS subgenreName,
+       t2.name AS metaName, t2.metaid, t2.xml AS metaXml,
+       t4.priority + t5.priority + t6.priority AS overallPriority,
+       t3.path AS path, t3.mediaid, 
+       t4.formatid, t4.name AS formatName, 
+       t5.formatclassid, t5.name AS formatclassName, 
+       t6.formattypeid, t6.name AS formattypeName 
+FROM t1, t2, t3, t4, t5, t6, t7, t8, t9, t10, t11
+WHERE t7.metaid = t2.metaid AND t7.artistid = t8.artistid AND
+      t9.metaid = t2.metaid AND t9.subgenreid = t10.subgenreid AND 
+      t10.genreid = t11.genreid AND  t3.metaid = t2.metaid AND
+      t3.formatid = t4.formatid AND t4.formatclassid = t5.formatclassid AND
+      t4.canaddtocapability =  'Y' AND t5.formattypeid = t6.formattypeid AND
+      t6.formattypeid IN (2) AND (t3.formatid IN (31, 8, 76)) AND
+      t1.metaid = t2.metaid AND t1.affiliateid = '2';
+
+SELECT t1.uniquekey, t1.xml AS affiliateXml,
+       t8.name AS artistName, t8.artistid, 
+       t11.name AS genreName, t11.genreid, t11.priority AS genrePriority,
+       t10.subgenreid, t10.name AS subgenreName,
+       t2.name AS metaName, t2.metaid, t2.xml AS metaXml,
+       t4.priority + t5.priority + t6.priority AS overallPriority,
+       t3.path AS path, t3.mediaid, 
+       t4.formatid, t4.name AS formatName, 
+       t5.formatclassid, t5.name AS formatclassName, 
+       t6.formattypeid, t6.name AS formattypeName 
+FROM t1, t2, t3, t4, t5, t6, t7, t8, t9, t10, t11
+WHERE t7.metaid = t2.metaid AND t7.artistid = t8.artistid AND
+      t9.metaid = t2.metaid AND t9.subgenreid = t10.subgenreid AND 
+      t10.genreid = t11.genreid AND  t3.metaid = t2.metaid AND
+      t3.formatid = t4.formatid AND t4.formatclassid = t5.formatclassid AND
+      t4.canaddtocapability =  'Y' AND t5.formattypeid = t6.formattypeid AND
+      t6.formattypeid IN (2) AND (t3.formatid IN (31, 8, 76)) AND
+      t1.metaid = t2.metaid AND t1.affiliateid = '2';
+
+DROP TABLE t1,t2,t3,t4,t5,t6,t7,t8,t9,t10,t11;
+
+#
+# Bug #37131: 3-way join query with BKA used with a small buffer and
+#             only for the third table
+#
+
+CREATE TABLE t1 (a1 int, filler1 char(64) default ' ' );
+CREATE TABLE t2 (
+  a2 int, b2 int, filler2 char(64) default ' ', 
+  PRIMARY KEY idx(a2,b2,filler2)
+) ;
+CREATE TABLE t3 (b3 int, c3 int, INDEX idx(b3));
+
+INSERT INTO t1(a1) VALUES 
+ (4), (7), (1), (9), (8), (5), (3), (6), (2);
+INSERT INTO t2(a2,b2) VALUES
+ (1,30), (3,40), (2,61), (6,73), (8,92), (9,27), (4,18), (5,84), (7,56),
+ (4,14), (6,76), (8,98), (7,55), (1,39), (2,68), (3,45), (9,21), (5,81),
+ (5,88), (2,65), (6,74), (9,23), (1,37), (3,44), (4,17), (8,99), (7,51),
+ (9,28), (7,52), (1,33), (4,13), (5,87), (3,43), (8,91), (2,62), (6,79),
+ (3,49), (8,93), (7,34), (5,82), (6,78), (2,63), (1,32), (9,22), (4,11);
+INSERT INTO t3 VALUES
+ (30,302), (92,923), (18,187), (45,459), (30,309), 
+ (39,393), (68,685), (45,458), (21,210), (81,817),
+ (40,405), (61,618), (73,738), (92,929), (27,275),
+ (18,188), (84,846), (56,564), (14,144), (76,763), 
+ (98,982), (55,551), (17,174), (99,998), (51,513),
+ (28,282), (52,527), (33,336), (13,138), (87,878), 
+ (43,431), (91,916), (62,624), (79,797), (49,494),
+ (93,933), (34,347), (82,829), (78,780), (63,634), 
+ (32,329), (22,228), (11,114), (74,749), (23,236);
+
+set join_cache_level=1;
+
+EXPLAIN
+SELECT a1<>a2, a1, a2, b2, b3, c3,
+       SUBSTR(filler1,1,1) AS s1, SUBSTR(filler2,1,1) AS s2
+FROM t1,t2,t3 WHERE a1=a2 AND b2=b3 AND MOD(c3,10)>7; 
+
+SELECT a1<>a2, a1, a2, b2, b3, c3,
+       SUBSTR(filler1,1,1) AS s1, SUBSTR(filler2,1,1) AS s2
+FROM t1,t2,t3 WHERE a1=a2 AND b2=b3 AND MOD(c3,10)>7;
+ 
+set join_cache_level=5;
+set join_buffer_size=512;
+
+EXPLAIN
+SELECT a1<>a2, a1, a2, b2, b3, c3,
+       SUBSTR(filler1,1,1) AS s1, SUBSTR(filler2,1,1) AS s2
+FROM t1,t2,t3 WHERE a1=a2 AND b2=b3 AND MOD(c3,10)>7; 
+
+SELECT a1<>a2, a1, a2, b2, b3, c3,
+       SUBSTR(filler1,1,1) AS s1, SUBSTR(filler2,1,1) AS s2
+FROM t1,t2,t3 WHERE a1=a2 AND b2=b3 AND MOD(c3,10)>7;
+ 
+DROP TABLE t1,t2,t3;
+
+#
+# Bug #37690: crash with a tiny buffer when using BKA_JOIN_CACHE_UNIQUE
+#
+
+CREATE TABLE t1 (a int, b int, INDEX idx(b));
+CREATE TABLE t2 (a int, b int, INDEX idx(a)); 
+INSERT INTO t1 VALUES (5,30), (3,20), (7,40), (2,10), (8,30), (1,10), (4,20);     
+INSERT INTO t2 VALUES (7,10), (1,20), (2,20), (8,20), (8,10), (1,20);
+INSERT INTO t2 VALUES (1,10), (4,20), (3,20), (7,20), (7,10), (1,20); 
+    
+set join_buffer_size=32; 
+set join_cache_level=8;  
+ 
+EXPLAIN SELECT * FROM t1,t2 WHERE t1.a=t2.a AND t1.b >= 30; 
+--sorted_result  
+SELECT * FROM t1,t2 WHERE t1.a=t2.a AND t1.b >= 30;  
+
+DROP TABLE t1,t2;
+ 
+--echo #
+--echo # Bug #40134: outer join with not exists optimization and join buffer
+--echo #
+
+set join_cache_level=default;
+set join_buffer_size=default;
+
+CREATE TABLE t1 (a int NOT NULL);
+INSERT INTO t1 VALUES (2), (4), (3), (5), (1);
+CREATE TABLE t2 (a int NOT NULL, b int NOT NULL, INDEX i_a(a));
+INSERT INTO t2 VALUES (4,10), (2,10), (2,30), (2,20), (4,20);
+
+EXPLAIN
+SELECT * FROM t1 LEFT JOIN t2 ON t1.a=t2.a WHERE t2.b IS NULL;
+SELECT * FROM t1 LEFT JOIN t2 ON t1.a=t2.a WHERE t2.b IS NULL;
+
+SET join_cache_level=6;
+EXPLAIN
+SELECT * FROM t1 LEFT JOIN t2 ON t1.a=t2.a WHERE t2.b IS NULL;
+SELECT * FROM t1 LEFT JOIN t2 ON t1.a=t2.a WHERE t2.b IS NULL;
+
+DROP TABLE t1, t2;
+
+set join_cache_level=default;
+set join_buffer_size=default;
+
+--echo #
+--echo # BUG#40136: Group by is ignored when join buffer is used for an outer join
+--echo #
+create table t1(a int PRIMARY KEY, b int);
+insert into t1 values
+  (5, 10), (2, 70), (7, 80), (6, 20), (1, 50), (9, 40), (8, 30), (3, 60);
+create table t2 (p int, a int, INDEX i_a(a));
+insert into t2 values
+  (103, 7), (109, 3), (102, 3), (108, 1), (106, 3),
+  (107, 7), (105, 1), (101, 3), (100, 7), (110, 1);
+set @save_join_cache_level=@@join_cache_level;
+set join_cache_level=6;
+--echo The following must not show "using join cache":
+explain
+select t1.a, count(t2.p) as count
+  from t1 left join t2 on t1.a=t2.a and t2.p % 2 = 1 group by t1.a;
+select t1.a, count(t2.p) as count
+  from t1 left join t2 on t1.a=t2.a and t2.p % 2 = 1 group by t1.a;
+set join_cache_level=@save_join_cache_level;
+drop table t1, t2;
+
+--echo #
+--echo # BUG#40268: Nested outer join with not null-rejecting where condition
+--echo #            over an inner table which is not the last in the nest
+--echo #
+
+CREATE TABLE t2 (a int, b int, c int);
+CREATE TABLE t3 (a int, b int, c int);
+CREATE TABLE t4 (a int, b int, c int);
+
+INSERT INTO t2 VALUES (3,3,0), (4,2,0), (5,3,0);
+INSERT INTO t3 VALUES (1,2,0), (2,2,0);
+INSERT INTO t4 VALUES (3,2,0), (4,2,0);
+
+set join_cache_level=6;
+
+SELECT t2.a,t2.b,t3.a,t3.b,t4.a,t4.b
+  FROM t2 LEFT JOIN (t3, t4) ON t2.b=t4.b
+     WHERE t3.a+2<t2.a OR t3.c IS NULL;
+
+set join_cache_level=default;
+DROP TABLE t2, t3, t4;
+
+--echo #
+--echo # Bug #40192: outer join with where clause when using BNL 
+--echo #
+
+create table t1 (a int, b int);
+insert into t1 values (2, 20), (3, 30), (1, 10);
+create table t2 (a int, c int);
+insert into t2 values (1, 101), (3, 102), (1, 100);
+
+set join_cache_level=6;
+
+select * from t1 left join t2 on t1.a=t2.a;
+explain select * from t1 left join t2 on t1.a=t2.a where t2.c=102 or t2.c is null;
+select * from t1 left join t2 on t1.a=t2.a where t2.c=102 or t2.c is null;
+
+set join_cache_level=default;
+drop table t1, t2;
+
+--echo #
+--echo # Bug #40317: outer join with with constant on expression equal to FALSE
+--echo #
+
+create table t1 (a int);
+insert into t1 values (30), (40), (20);
+create table t2 (b int);
+insert into t2 values (200), (100);
+
+set join_cache_level=6;
+
+select * from t1 left join t2 on (1=0);
+explain select * from t1 left join t2 on (1=0) where a=40;
+select * from t1 left join t2 on (1=0) where a=40;
+
+set join_cache_level=1;
+explain select * from t1 left join t2 on (1=0);
+
+set join_cache_level=default;
+drop table t1, t2;
+
+--echo #
+--echo # Bug #41204: small buffer with big rec_per_key for ref access
+--echo #
+
+CREATE TABLE t1 (a int);
+
+INSERT INTO t1 VALUES (0);
+INSERT INTO t1(a) SELECT a FROM t1;
+INSERT INTO t1(a) SELECT a FROM t1;
+INSERT INTO t1(a) SELECT a FROM t1;
+INSERT INTO t1(a) SELECT a FROM t1;
+INSERT INTO t1(a) SELECT a FROM t1;
+INSERT INTO t1(a) SELECT a FROM t1;
+INSERT INTO t1(a) SELECT a FROM t1;
+INSERT INTO t1(a) SELECT a FROM t1;
+INSERT INTO t1(a) SELECT a FROM t1;
+INSERT INTO t1(a) SELECT a FROM t1;
+INSERT INTO t1(a) SELECT a FROM t1;
+INSERT INTO t1 VALUES (20000), (10000);
+
+CREATE TABLE t2 (pk int AUTO_INCREMENT PRIMARY KEY, b int, c int, INDEX idx(b));
+INSERT INTO t2(b,c) VALUES (10000, 3), (20000, 7), (20000, 1), (10000, 9), (20000, 5);
+INSERT INTO t2(b,c) SELECT b,c FROM t2;
+INSERT INTO t2(b,c) SELECT b,c FROM t2;
+INSERT INTO t2(b,c) SELECT b,c FROM t2;
+INSERT INTO t2(b,c) SELECT b,c FROM t2;
+INSERT INTO t2(b,c) SELECT b,c FROM t2;
+INSERT INTO t2(b,c) SELECT b,c FROM t2;
+INSERT INTO t2(b,c) SELECT b,c FROM t2;
+INSERT INTO t2(b,c) SELECT b,c FROM t2;
+
+--disable_result_log
+ANALYZE TABLE t1,t2;
+--enable_result_log
+
+set join_cache_level=6;
+set join_buffer_size=1024;
+
+EXPLAIN SELECT AVG(c) FROM t1,t2 WHERE t1.a=t2.b;
+SELECT AVG(c) FROM t1,t2 WHERE t1.a=t2.b;
+
+set join_buffer_size=default;
+set join_cache_level=default;
+
+DROP TABLE t1, t2;
+
+--echo #
+--echo # Bug #41894: big join buffer of level 7 used to join records
+--echo #              with null values in place of varchar strings
+--echo #
+
+CREATE TABLE t1 (a int NOT NULL AUTO_INCREMENT PRIMARY KEY,
+                 b varchar(127) DEFAULT NULL);
+
+INSERT INTO t1(a) VALUES (1);
+INSERT INTO t1(b) SELECT b FROM t1;
+INSERT INTO t1(b) SELECT b FROM t1;
+INSERT INTO t1(b) SELECT b FROM t1;
+INSERT INTO t1(b) SELECT b FROM t1;
+INSERT INTO t1(b) SELECT b FROM t1;
+INSERT INTO t1(b) SELECT b FROM t1;
+INSERT INTO t1(b) SELECT b FROM t1;
+INSERT INTO t1(b) SELECT b FROM t1;
+INSERT INTO t1(b) SELECT b FROM t1;
+INSERT INTO t1(b) SELECT b FROM t1;
+INSERT INTO t1(b) SELECT b FROM t1;
+INSERT INTO t1(b) SELECT b FROM t1;
+INSERT INTO t1(b) SELECT b FROM t1;
+INSERT INTO t1(b) SELECT b FROM t1;
+
+CREATE TABLE t2 (a int NOT NULL PRIMARY KEY, b varchar(127) DEFAULT NULL);
+INSERT INTO t2 SELECT * FROM t1;
+
+CREATE TABLE t3 (a int NOT NULL PRIMARY KEY, b varchar(127) DEFAULT NULL);
+INSERT INTO t3 SELECT * FROM t1;
+
+set join_cache_level=7;
+set join_buffer_size=1024*1024;
+
+EXPLAIN
+SELECT COUNT(*) FROM t1,t2,t3
+  WHERE t1.a=t2.a AND t2.a=t3.a AND
+        t1.b IS NULL AND t2.b IS NULL AND t3.b IS NULL;
+
+SELECT COUNT(*) FROM t1,t2,t3
+  WHERE t1.a=t2.a AND t2.a=t3.a AND
+        t1.b IS NULL AND t2.b IS NULL AND t3.b IS NULL;
+
+set join_buffer_size=default;
+set join_cache_level=default;
+
+DROP TABLE t1,t2,t3;
+
+--echo #
+--echo # Bug #42020: join buffer is used  for outer join with fields of 
+--echo #             several outer tables in join buffer
+--echo #
+
+CREATE TABLE t1 (
+  a bigint NOT NULL,
+  PRIMARY KEY (a) 
+);
+INSERT INTO t1 VALUES
+  (2), (1);
+
+CREATE TABLE t2 (
+  a bigint NOT NULL,
+  b bigint NOT NULL,
+  PRIMARY KEY (a,b)
+);
+INSERT INTO t2 VALUES
+  (2,30), (2,40), (2,50), (2,60), (2,70), (2,80),
+  (1,10), (1, 20), (1,30), (1,40), (1,50);
+
+CREATE TABLE t3 (
+  pk bigint NOT NULL AUTO_INCREMENT,
+  a bigint NOT NULL,
+  b bigint NOT NULL,
+  val bigint DEFAULT '0',
+  PRIMARY KEY (pk),
+  KEY idx (a,b)
+);
+INSERT INTO t3(a,b) VALUES
+  (2,30), (2,40), (2,50), (2,60), (2,70), (2,80),
+  (4,30), (4,40), (4,50), (4,60), (4,70), (4,80),
+  (5,30), (5,40), (5,50), (5,60), (5,70), (5,80),
+  (7,30), (7,40), (7,50), (7,60), (7,70), (7,80);
+
+SELECT t1.a, t2.a, t3.a, t2.b, t3.b, t3.val 
+  FROM (t1,t2) LEFT JOIN t3 ON (t1.a=t3.a AND t2.b=t3.b) 
+    WHERE t1.a=t2.a; 
+
+set join_cache_level=6;
+set join_buffer_size=256;
+
+EXPLAIN
+SELECT t1.a, t2.a, t3.a, t2.b, t3.b, t3.val 
+  FROM (t1,t2) LEFT JOIN t3 ON (t1.a=t3.a AND t2.b=t3.b) 
+    WHERE t1.a=t2.a; 
+--sorted_result
+SELECT t1.a, t2.a, t3.a, t2.b, t3.b, t3.val 
+  FROM (t1,t2) LEFT JOIN t3 ON (t1.a=t3.a AND t2.b=t3.b) 
+    WHERE t1.a=t2.a;
+
+DROP INDEX idx ON t3;
+set join_cache_level=4;
+
+EXPLAIN
+SELECT t1.a, t2.a, t3.a, t2.b, t3.b, t3.val 
+  FROM (t1,t2) LEFT JOIN t3 ON (t1.a=t3.a AND t2.b=t3.b) 
+    WHERE t1.a=t2.a; 
+
+--sorted_result
+SELECT t1.a, t2.a, t3.a, t2.b, t3.b, t3.val 
+  FROM (t1,t2) LEFT JOIN t3 ON (t1.a=t3.a AND t2.b=t3.b) 
+    WHERE t1.a=t2.a; 
+
+set join_buffer_size=default;
+set join_cache_level=default;
+
+DROP TABLE t1,t2,t3;
+
+#
+# WL#4424 Full index condition pushdown with batched key access join
+#
+create table t1(f1 int, f2 int);
+insert into t1 values (1,1),(2,2),(3,3);
+create table t2(f1 int not null, f2 int not null, f3 char(200), key(f1,f2));
+insert into t2 values (1,1, 'qwerty'),(1,2, 'qwerty'),(1,3, 'qwerty');
+insert into t2 values (2,1, 'qwerty'),(2,2, 'qwerty'),(2,3, 'qwerty'),
+                      (2,4, 'qwerty'),(2,5, 'qwerty');
+insert into t2 values (3,1, 'qwerty'),(3,4, 'qwerty');
+insert into t2 values (4,1, 'qwerty'),(4,2, 'qwerty'),(4,3, 'qwerty'),
+                      (4,4, 'qwerty');
+insert into t2 values (1,1, 'qwerty'),(1,2, 'qwerty'),(1,3, 'qwerty');
+insert into t2 values (2,1, 'qwerty'),(2,2, 'qwerty'),(2,3, 'qwerty'),
+                      (2,4, 'qwerty'),(2,5, 'qwerty');
+insert into t2 values (3,1, 'qwerty'),(3,4, 'qwerty');
+insert into t2 values (4,1, 'qwerty'),(4,2, 'qwerty'),(4,3, 'qwerty'),
+                      (4,4, 'qwerty');
+
+set join_cache_level=5;
+select t2.f1, t2.f2, t2.f3 from t1,t2
+where t1.f1=t2.f1 and t2.f2 between t1.f1 and t1.f2 and t2.f2 + 1 >= t1.f1 + 1;
+
+explain select t2.f1, t2.f2, t2.f3 from t1,t2
+where t1.f1=t2.f1 and t2.f2 between t1.f1 and t2.f2;
+
+set join_cache_level=6;
+select t2.f1, t2.f2, t2.f3 from t1,t2
+where t1.f1=t2.f1 and t2.f2 between t1.f1 and t1.f2 and t2.f2 + 1 >= t1.f1 + 1;
+
+explain select t2.f1, t2.f2, t2.f3 from t1,t2
+where t1.f1=t2.f1 and t2.f2 between t1.f1 and t2.f2;
+
+set join_cache_level=7;
+select t2.f1, t2.f2, t2.f3 from t1,t2
+where t1.f1=t2.f1 and t2.f2 between t1.f1 and t1.f2 and t2.f2 + 1 >= t1.f1 + 1;
+
+explain select t2.f1, t2.f2, t2.f3 from t1,t2
+where t1.f1=t2.f1 and t2.f2 between t1.f1 and t2.f2;
+
+set join_cache_level=8;
+select t2.f1, t2.f2, t2.f3 from t1,t2
+where t1.f1=t2.f1 and t2.f2 between t1.f1 and t1.f2 and t2.f2 + 1 >= t1.f1 + 1;
+
+explain select t2.f1, t2.f2, t2.f3 from t1,t2
+where t1.f1=t2.f1 and t2.f2 between t1.f1 and t2.f2;
+
+drop table t1,t2;
+set join_cache_level=default;
+
+--echo #
+--echo # Bug #42955: join with GROUP BY/ORDER BY and when BKA is enabled 
+--echo #             
+
+create table t1 (d int, id1 int, index idx1 (d, id1));
+insert into t1 values
+  (3, 20), (2, 40), (3, 10), (1, 10), (3, 20), (1, 40), (2, 30), (3, 30);
+
+create table t2 (id1 int, id2 int, index idx2 (id1));
+insert into t2 values 
+  (20, 100), (30, 400), (20, 400), (30, 200), (10, 300), (10, 200), (40, 100),
+  (40, 200), (30, 300), (10, 400), (20, 200), (20, 300);   
+
+set join_cache_level=6;
+
+explain
+select t1.id1, sum(t2.id2) from t1 join t2 on t1.id1=t2.id1 
+  where t1.d=3 group by t1.id1;
+
+select t1.id1, sum(t2.id2) from t1 join t2 on t1.id1=t2.id1 
+  where t1.d=3 group by t1.id1;
+
+explain
+select t1.id1  from t1 join t2 on t1.id1=t2.id1 
+ where t1.d=3 and t2.id2 > 200 order by t1.id1;
+
+select t1.id1  from t1 join t2 on t1.id1=t2.id1 
+ where t1.d=3 and t2.id2 > 200 order by t1.id1;
+
+set join_cache_level=default;
+
+drop table t1,t2;
+
+--echo #
+--echo # Bug #44019: star-like multi-join query executed join_cache_level=6 
+--echo #             
+
+create table t1 (a int, b int, c int, d int);
+create table t2 (b int, e varchar(16), index idx(b));
+create table t3 (d int, f varchar(16), index idx(d));
+create table t4 (c int, g varchar(16), index idx(c));
+
+insert into t1 values
+  (5, 50, 500, 5000), (3, 30, 300, 3000), (9, 90, 900, 9000),
+  (2, 20, 200, 2000), (4, 40, 400, 4000), (8, 80, 800, 800),
+  (7, 70, 700, 7000);
+insert into t2 values
+  (30, 'bbb'), (10, 'b'), (70, 'bbbbbbb'), (60, 'bbbbbb'),
+  (31, 'bbb'), (11, 'b'), (71, 'bbbbbbb'), (61, 'bbbbbb'),
+  (32, 'bbb'), (12, 'b'), (72, 'bbbbbbb'), (62, 'bbbbbb');
+insert into t3 values
+  (4000, 'dddd'), (3000, 'ddd'), (1000, 'd'), (8000, 'dddddddd'),
+  (4001, 'dddd'), (3001, 'ddd'), (1001, 'd'), (8001, 'dddddddd'),
+  (4002, 'dddd'), (3002, 'ddd'), (1002, 'd'), (8002, 'dddddddd');
+insert into t4 values
+  (200, 'cc'), (600, 'cccccc'), (300, 'ccc'), (500, 'ccccc'),
+  (201, 'cc'), (601, 'cccccc'), (301, 'ccc'), (501, 'ccccc'),
+  (202, 'cc'), (602, 'cccccc'), (302, 'ccc'), (502, 'ccccc');
+
+--disable_result_log
+--disable_warnings
+analyze table t2,t3,t4;
+--enable_warnings
+--enable_result_log
+
+set join_cache_level=1;
+explain 
+select t1.a, t1.b, t1.c, t1.d, t2.e, t3.f, t4.g from t1,t2,t3,t4
+  where t2.b=t1.b and t3.d=t1.d and t4.c=t1.c;
+
+select t1.a, t1.b, t1.c, t1.d, t2.e, t3.f, t4.g from t1,t2,t3,t4
+  where t2.b=t1.b and t3.d=t1.d and t4.c=t1.c;
+
+set join_cache_level=6;
+explain 
+select t1.a, t1.b, t1.c, t1.d, t2.e, t3.f, t4.g from t1,t2,t3,t4
+  where t2.b=t1.b and t3.d=t1.d and t4.c=t1.c;
+
+select t1.a, t1.b, t1.c, t1.d, t2.e, t3.f, t4.g from t1,t2,t3,t4
+  where t2.b=t1.b and t3.d=t1.d and t4.c=t1.c;
+
+set join_cache_level=default;
+
+drop table t1,t2,t3,t4;
+
+--echo #
+--echo # Bug #44250: Corruption of linked join buffers when using BKA 
+--echo #             
+
+CREATE TABLE t1 (
+  id1 bigint(20) DEFAULT NULL,
+  id2 bigint(20) DEFAULT NULL,
+  id3 bigint(20) DEFAULT NULL,
+  num1 bigint(20) DEFAULT NULL,
+  num2 int(11) DEFAULT NULL,
+  num3 bigint(20) DEFAULT NULL
+);
+
+CREATE TABLE t2 (
+  id3 bigint(20) NOT NULL DEFAULT '0',
+  id4 bigint(20) DEFAULT NULL,
+  enum1 enum('Enabled','Disabled','Paused') DEFAULT NULL,
+  PRIMARY KEY (id3)
+);
+
+CREATE TABLE t3 (
+  id4 bigint(20) NOT NULL DEFAULT '0',
+  text1 text,
+  PRIMARY KEY (id4)
+);
+
+CREATE TABLE t4 (
+  id2 bigint(20) NOT NULL DEFAULT '0',
+  dummy int(11) DEFAULT '0',
+  PRIMARY KEY (id2)
+);
+
+CREATE TABLE t5 (
+  id1 bigint(20) NOT NULL DEFAULT '0',
+  id2 bigint(20) NOT NULL DEFAULT '0',
+  enum2 enum('Active','Deleted','Paused') DEFAULT NULL,
+  PRIMARY KEY (id1,id2)
+);
+
+--disable_query_log
+--disable_result_log
+--disable_warnings
+
+INSERT INTO t1 VALUES 
+(228172702,72485641,2667134182,10,1,14),(228172702,94266195,2667134182,134,0,134),
+(228172702,94266195,2667134182,15,0,15),(228172702,94266195,2667134182,2,0,3),
+(228172702,818095880,2667134182,1,1,1),(228172702,1004959639,2667134182,3,0,3),
+(228172702,1297484422,2667134182,1,2,1),(228172702,1730911800,2667134182,11,0,28),
+(228172702,1730911800,2667134182,4,0,4),(228172702,2182755982,2667134182,5,0,15),
+(228172702,2182755982,2667134182,1,0,1),(228172702,2968841184,2667134182,1,0,1),
+(228172702,4765525626,2667134182,2,0,3),(228172702,4765525626,2667134182,29,0,38),
+(228172702,4765525626,2667134182,7,0,7),(228172702,4765525626,2667134182,7,0,8),
+(228172702,5330573302,2667134182,1,0,1),(228512602,191149872,935692942,3,0,17),
+(228512602,259118753,935692942,13,7,13),(228512602,259118753,935692942,83,33,83),
+(228512602,585705465,935692942,1,0,1),(228512602,585716775,935692942,1,0,1),
+(228512602,585716775,935692942,6,6,6),(228512602,585716775,935692942,1,1,1),
+(228512602,1105371172,935692942,2,0,3),(228512602,1105371172,935692942,7,2,7),
+(228512602,1314223462,935692942,1,0,1),(228512602,1314223642,935692942,1,1,1),
+(228512602,1411060522,935692942,1,0,1),(228512602,1467398182,935692942,1,0,1),
+(228512602,1467398182,935692942,3,0,4),(228512602,1467398242,935692942,10,0,41),
+(228512602,1467398242,935692942,28,0,40),(228512602,1467398242,935692942,0,0,0),
+(228512602,1467398242,935692942,29,2,33),(228512602,1734178942,935692942,1,0,1),
+(228512602,1734179122,935692942,1,0,4),(228512602,1734179122,935692942,3,0,6),
+(228512602,1953612870,935692942,1,0,1),(228512602,2271510562,935692942,1,1,1),
+(228512602,2271525022,935692942,0,0,0),(228512602,3058831402,935692942,1,1,1),
+(228512602,3723638842,935692942,1,1,1),(228512602,3723638842,935692942,4,3,4),
+(228512602,3723836602,935692942,1,1,1),(228512602,3723836842,935692942,1,1,1),
+(228512602,3723836962,935692942,1,1,1),(228512602,3723988102,935692942,11,4,11),
+(228512602,3723989182,935692942,8,3,8),(228512602,5920283002,935692942,1,0,1),
+(228512602,5920314232,935692942,1,0,1),(228512602,191149872,1241589892,0,0,0),
+(228512602,191149872,1241589892,2,0,4),(228512602,191149872,1241589892,0,0,0),
+(228512602,259118753,1241589892,8,4,8),(228512602,259118753,1241589892,70,33,70),
+(228512602,259118753,1241589892,1,1,1),(228512602,585716775,1241589892,8,7,8),
+(228512602,1105371172,1241589892,1,0,1),(228512602,1105371172,1241589892,9,0,9),
+(228512602,1314223462,1241589892,1,0,1),(228512602,1411060522,1241589892,1,1,1),
+(228512602,1467398182,1241589892,1,0,1),(228512602,1467398182,1241589892,4,1,4),
+(228512602,1467398182,1241589892,1,0,1),(228512602,1467398242,1241589892,10,0,28),
+(228512602,1467398242,1241589892,37,1,78),(228512602,1467398242,1241589892,28,9,30),
+(228512602,1467398242,1241589892,5,0,6),(228512602,1734179122,1241589892,3,1,18),
+(228512602,1734179122,1241589892,1,1,1),(228512602,1734179122,1241589892,2,0,3),
+(228512602,1953611430,1241589892,1,1,1),(228512602,1953611430,1241589892,1,1,1),
+(228512602,1953612870,1241589892,1,0,1),(228512602,2026844250,1241589892,1,0,1),
+(228512602,2271510562,1241589892,1,1,1),(228512602,2271525022,1241589892,1,0,1),
+(228512602,2941612417,1241589892,1,0,1),(228512602,3723988102,1241589892,1,0,1);
+INSERT INTO t1 VALUES
+(228512602,3723988102,1241589892,11,4,11),(228512602,3723989002,1241589892,1,0,1),
+(228512602,3752960902,1241589892,2,2,4),(228808822,17304242,935693782,6,0,17),
+(228808822,17304242,935693782,28,1,50),(228808822,17304242,935693782,29,3,61),
+(228808822,17304242,935693782,6,0,13),(228808822,30931012,935693782,21,0,60),
+(228808822,30931012,935693782,5,0,13),(228808822,37254452,935693782,3,0,3),
+(228808822,42726891,935693782,1,0,4),(228808822,42726891,935693782,3,0,6),
+(228808822,76261151,935693782,8,0,18),(228808822,88240139,935693782,1,0,1),
+(228808822,88240139,935693782,3,0,3),(228808822,94730895,935693782,2,0,4),
+(228808822,179737402,935693782,10,0,13),(228808822,179737402,935693782,7,0,8),
+(228808822,179737402,935693782,3,0,4),(228808822,271288782,935693782,1,0,6),
+(228808822,304690943,935693782,5,2,10),(228808822,304691183,935693782,4,0,16),
+(228808822,568994960,935693782,1,0,1),(228808822,631705925,935693782,1,0,1),
+(228808822,631745165,935693782,1,0,1),(228808822,631749605,935693782,1,0,4),
+(228808822,1057787002,935693782,1,0,1),(228808822,1057787002,935693782,2,1,4),
+(228808822,1057787002,935693782,12,1,20),(228808822,1057788022,935693782,2,0,40),
+(228808822,1057788022,935693782,2,1,3),(228808822,1057788022,935693782,9,2,16),
+(228808822,1335646822,935693782,3,1,6),(228808822,1335646882,935693782,1,0,3),
+(228808822,1335646882,935693782,1,0,3),(228808822,1335646942,935693782,7,2,15),
+(228808822,5510586183,935693782,1,1,1),(228808822,17304242,2482416112,11,0,28),
+(228808822,17304242,2482416112,34,0,62),(228808822,17304242,2482416112,43,2,89),
+(228808822,17304242,2482416112,9,0,19),(228808822,30931012,2482416112,32,2,84),
+(228808822,30931012,2482416112,6,0,14),(228808822,30931012,2482416112,2,0,9),
+(228808822,37254452,2482416112,1,1,1),(228808822,42726891,2482416112,2,0,10),
+(228808822,76261151,2482416112,11,0,26),(228808822,88240139,2482416112,3,0,3),
+(228808822,88240139,2482416112,1,0,1),(228808822,88240139,2482416112,3,0,4),
+(228808822,94730895,2482416112,1,0,3),(228808822,125469602,2482416112,0,0,0),
+(228808822,179737402,2482416112,4,0,10),(228808822,179737402,2482416112,8,1,9),
+(228808822,179737402,2482416112,7,1,9),(228808822,179737402,2482416112,1,0,1),
+(228808822,271288782,2482416112,2,0,14),(228808822,304690943,2482416112,3,0,6),
+(228808822,304691183,2482416112,1,0,4),(228808822,555689643,2482416112,2,1,8),
+(228808822,555689643,2482416112,1,0,4),(228808822,631705925,2482416112,1,0,1),
+(228808822,631712555,2482416112,1,0,1),(228808822,631745165,2482416112,1,0,1),
+(228808822,710348755,2482416112,1,0,1),(228808822,753718113,2482416112,1,0,1),
+(228808822,1057787002,2482416112,1,0,4),(228808822,1057787002,2482416112,1,0,1),
+(228808822,1057787002,2482416112,4,1,7),(228808822,1057788022,2482416112,7,0,12),
+(228808822,1057788022,2482416112,3,0,37),(228808822,1057788022,2482416112,0,0,0),
+(228808822,1057788022,2482416112,12,0,15),(228808822,1335646822,2482416112,14,1,28),
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+(233937022,11890554322,'Active'),(233937022,11890756102,'Active'),
+(233937022,12641851,'Active'),(233937022,14913951,'Active'),
+(233937022,21835210,'Active'),(233937022,26481052,'Active'),
+(233937022,35617681,'Active'),(233937022,123639716,'Active'),
+(233937022,155454324,'Active'),(233937022,299001668,'Active'),
+(233937022,897886118,'Active'),(233937022,1005147016,'Active'),
+(233937022,1082217873,'Active'),(233937022,1286925326,'Active'),
+(233937022,1407236408,'Active'),(233937022,4371581485,'Active'),
+(233937022,5283491332,'Active'),(233937022,7300486013,'Active'),
+(233937022,11890754392,'Active');
+
+--enable_warnings
+--enable_result_log
+--enable_query_log
+
+set join_cache_level=8;
+set join_buffer_size=2048;
+
+EXPLAIN
+SELECT STRAIGHT_JOIN t1.id1, t1.num3, t3.text1, t3.id4, t2.id3, t4.dummy
+  FROM t1 JOIN  t2 JOIN  t3 JOIN  t4 JOIN  t5 
+    WHERE t1.id1=t5.id1 AND t1.id2=t5.id2 and  t4.id2=t1.id2 AND
+          t5.enum2='Active' AND t3.id4=t2.id4 AND t2.id3=t1.id3 AND t3.text1<'D';
+
+SELECT STRAIGHT_JOIN t1.id1, t1.num3, t3.text1, t3.id4, t2.id3, t4.dummy
+  FROM t1 JOIN  t2 JOIN  t3 JOIN  t4 JOIN  t5 
+    WHERE t1.id1=t5.id1 AND t1.id2=t5.id2 and  t4.id2=t1.id2 AND
+          t5.enum2='Active' AND t3.id4=t2.id4 AND t2.id3=t1.id3 AND t3.text1<'D';
+
+set join_buffer_size=default;
+set join_cache_level=default;
+
+DROP TABLE t1,t2,t3,t4,t5;
+
+--echo #
+--echo # Bug#45267: Incomplete check caused wrong result.
+--echo #
+CREATE TABLE t1 (
+  `pk` int(11) NOT NULL AUTO_INCREMENT PRIMARY KEY
+);
+CREATE TABLE t3 (
+  `pk` int(11) NOT NULL AUTO_INCREMENT PRIMARY KEY
+);
+INSERT INTO t3 VALUES
+(1),(2),(3),(4),(5),(6),(7),(8),(9),(10),(11),(12),(13),(14),(15),
+(16),(17),(18),(19),(20);
+CREATE TABLE t2 (
+  `pk` int(11) NOT NULL AUTO_INCREMENT,
+  `int_nokey` int(11) NOT NULL,
+  `time_key` time NOT NULL,
+  PRIMARY KEY (`pk`),
+  KEY `time_key` (`time_key`)
+);
+INSERT INTO t2 VALUES (10,9,'22:36:46'),(11,0,'08:46:46');
+
+SELECT DISTINCT t1.`pk`
+FROM t1 RIGHT JOIN t2 STRAIGHT_JOIN t3 ON t2.`int_nokey`  ON t2.`time_key`
+GROUP BY 1;
+
+DROP TABLE IF EXISTS t1, t2, t3;
+
+--echo #
+--echo # Bug #46328: Use of aggregate function without GROUP BY clause 
+--echo #             returns many rows (vs. one )
+--echo #             
+
+CREATE TABLE t1 (
+  int_key int(11) NOT NULL,
+  KEY int_key (int_key)
+);
+
+INSERT INTO t1 VALUES
+(0),(2),(2),(2),(3),(4),(5),(5),(6),(6),(8),(8),(9),(9);
+
+CREATE TABLE t2 (
+  int_key int(11) NOT NULL,
+  KEY int_key (int_key)
+);
+
+INSERT INTO t2 VALUES (2),(3);
+
+--echo
+
+--echo # The query shall return 1 record with a max value 9 and one of the 
+--echo # int_key values inserted above (undefined which one). A changed 
+--echo # execution plan may change the value in the second column
+SELECT  MAX(t1.int_key), t1.int_key
+FROM t1 STRAIGHT_JOIN t2  
+ORDER BY t1.int_key;
+
+--echo
+
+explain 
+SELECT  MAX(t1.int_key), t1.int_key
+FROM t1 STRAIGHT_JOIN t2  
+ORDER BY t1.int_key;
+
+--echo
+
+DROP TABLE t1,t2;
+
+SET join_cache_level=default;
+
+--echo #
+--echo # Regression test for
+--echo # Bug#46733 - NULL value not returned for aggregate on empty result 
+--echo #             set w/ semijoin on
+--echo #
+
+CREATE TABLE t1 (
+  i int(11) NOT NULL,
+  v varchar(1) DEFAULT NULL,
+  PRIMARY KEY (i)
+);
+
+INSERT INTO t1 VALUES (10,'a'),(11,'b'),(12,'c'),(13,'d');
+
+CREATE TABLE t2 (
+  i int(11) NOT NULL,
+  v varchar(1) DEFAULT NULL,
+  PRIMARY KEY (i)
+);
+
+INSERT INTO t2 VALUES (1,'x'),(2,'y');
+
+--echo
+
+SELECT MAX(t1.i) 
+FROM t1 JOIN t2 ON t2.v
+ORDER BY t2.v;
+
+--echo
+
+EXPLAIN
+SELECT MAX(t1.i) 
+FROM t1 JOIN t2 ON t2.v
+ORDER BY t2.v;
+
+--echo
+
+DROP TABLE t1,t2;
+
+--echo #
+--echo # Bug #45092: join buffer contains two blob columns one of which is
+--echo #             used in the key employed to access the joined table
+--echo #
+
+CREATE TABLE t1 (c1 int, c2 int, key (c2));
+INSERT INTO t1 VALUES (1,1);
+INSERT INTO t1 VALUES (2,2);
+
+CREATE TABLE t2 (c1 text, c2 text);
+INSERT INTO t2 VALUES('tt', 'uu');
+INSERT INTO t2 VALUES('zzzz', 'xxxxxxxxx');
+
+--disable_result_log
+ANALYZE TABLE t1,t2;
+--enable_result_log
+
+set join_cache_level=6;
+
+SELECT t1.*, t2.*, LENGTH(t2.c1), LENGTH(t2.c2) FROM t1,t2
+  WHERE t1.c2=LENGTH(t2.c2) and t1.c1=LENGTH(t2.c1);
+
+set join_cache_level=default;
+
+DROP TABLE t1,t2;

=== added file 'mysql-test/t/join_nested_jcl6.test'
--- a/mysql-test/t/join_nested_jcl6.test	1970-01-01 00:00:00 +0000
+++ b/mysql-test/t/join_nested_jcl6.test	2009-12-21 02:26:15 +0000
@@ -0,0 +1,95 @@
+# 
+# Run join_nested.test with BKA enabled 
+#
+
+set join_cache_level=6;
+show variables like 'join_cache_level';
+
+--source t/join_nested.test
+
+#
+# BUG#35835: queries with nested outer joins with BKA enabled
+#            
+
+CREATE TABLE t5 (a int, b int, c int, PRIMARY KEY(a), KEY b_i (b));
+CREATE TABLE t6 (a int, b int, c int, PRIMARY KEY(a), KEY b_i (b));
+CREATE TABLE t7 (a int, b int, c int, PRIMARY KEY(a), KEY b_i (b));
+CREATE TABLE t8 (a int, b int, c int, PRIMARY KEY(a), KEY b_i (b));
+
+INSERT INTO t5 VALUES (1,1,0), (2,2,0), (3,3,0);
+INSERT INTO t6 VALUES (1,2,0), (3,2,0), (6,1,0);
+INSERT INTO t7 VALUES (1,1,0), (2,2,0);
+INSERT INTO t8 VALUES (0,2,0), (1,2,0);
+
+EXPLAIN
+SELECT t5.a,t5.b,t6.a,t6.b,t7.a,t7.b,t8.a,t8.b
+  FROM t5 
+       LEFT JOIN 
+       ( 
+         (t6, t7)
+         LEFT JOIN 
+         t8
+         ON t7.b=t8.b AND t6.b < 10
+       )
+       ON t6.b >= 2 AND t5.b=t7.b AND
+          (t8.a > 0 OR t8.c IS NULL);
+
+SELECT t5.a,t5.b,t6.a,t6.b,t7.a,t7.b,t8.a,t8.b
+  FROM t5 
+       LEFT JOIN 
+       ( 
+         (t6, t7)
+         LEFT JOIN 
+         t8
+         ON t7.b=t8.b AND t6.b < 10
+       )
+       ON t6.b >= 2 AND t5.b=t7.b AND
+          (t8.a > 0 OR t8.c IS NULL);
+
+DELETE FROM t5;
+DELETE FROM t6;
+DELETE FROM t7;
+DELETE FROM t8;
+
+INSERT INTO t5 VALUES (1,3,0), (3,2,0);
+INSERT INTO t6 VALUES (3,3,0);
+INSERT INTO t7 VALUES (1,2,0);
+INSERT INTO t8 VALUES (1,1,0);
+
+EXPLAIN
+SELECT t5.a,t5.b,t6.a,t6.b,t7.a,t7.b,t8.a,t8.b
+  FROM t5 LEFT JOIN                
+       (t6 LEFT JOIN t7 ON t7.a=1, t8)
+       ON (t5.b=t8.b);
+
+SELECT t5.a,t5.b,t6.a,t6.b,t7.a,t7.b,t8.a,t8.b
+  FROM t5 LEFT JOIN                
+       (t6 LEFT JOIN t7 ON t7.a=1, t8)
+       ON (t5.b=t8.b);
+
+EXPLAIN
+SELECT t5.a,t5.b,t6.a,t6.b,t7.a,t7.b,t8.a,t8.b
+  FROM t5 LEFT JOIN                
+       (t6 LEFT JOIN t7 ON t7.b=2, t8)
+       ON (t5.b=t8.b);
+
+SELECT t5.a,t5.b,t6.a,t6.b,t7.a,t7.b,t8.a,t8.b
+  FROM t5 LEFT JOIN                
+       (t6 LEFT JOIN t7 ON t7.b=2, t8)
+       ON (t5.b=t8.b);
+
+EXPLAIN
+SELECT t5.a,t5.b,t6.a,t6.b,t7.a,t7.b,t8.a,t8.b
+  FROM t5 LEFT JOIN                
+       (t8, t6 LEFT JOIN t7 ON t7.a=1)
+       ON (t5.b=t8.b);
+
+SELECT t5.a,t5.b,t6.a,t6.b,t7.a,t7.b,t8.a,t8.b
+  FROM t5 LEFT JOIN                
+       (t8, t6 LEFT JOIN t7 ON t7.a=1)
+       ON (t5.b=t8.b);
+
+DROP TABLE t5,t6,t7,t8;
+
+set join_cache_level=default;
+show variables like 'join_cache_level';

=== added file 'mysql-test/t/join_outer_jcl6.test'
--- a/mysql-test/t/join_outer_jcl6.test	1970-01-01 00:00:00 +0000
+++ b/mysql-test/t/join_outer_jcl6.test	2009-12-21 02:26:15 +0000
@@ -0,0 +1,11 @@
+# 
+# Run join_outer.test with BKA enabled 
+#
+
+set join_cache_level=6;
+show variables like 'join_cache_level';
+
+--source t/join_outer.test
+
+set join_cache_level=default;
+show variables like 'join_cache_level';

=== added file 'mysql-test/t/select_jcl6.test'
--- a/mysql-test/t/select_jcl6.test	1970-01-01 00:00:00 +0000
+++ b/mysql-test/t/select_jcl6.test	2009-12-21 02:26:15 +0000
@@ -0,0 +1,11 @@
+# 
+# Run select.test with BKA enabled 
+#
+
+set join_cache_level=6;
+show variables like 'join_cache_level';
+
+--source t/select.test
+
+set join_cache_level=default;
+show variables like 'join_cache_level';

=== modified file 'sql/CMakeLists.txt'
--- a/sql/CMakeLists.txt	2009-12-15 22:37:39 +0000
+++ b/sql/CMakeLists.txt	2009-12-21 02:26:15 +0000
@@ -62,9 +62,10 @@ SET (SQL_SOURCE
                sp_rcontext.cc spatial.cc sql_acl.cc sql_analyse.cc sql_base.cc 
                sql_cache.cc sql_class.cc sql_client.cc sql_crypt.cc sql_crypt.h 
                sql_cursor.cc sql_db.cc sql_delete.cc sql_derived.cc sql_do.cc 
-               sql_error.cc sql_handler.cc sql_help.cc sql_insert.cc sql_lex.cc 
-               sql_list.cc sql_load.cc sql_manager.cc sql_map.cc sql_parse.cc 
-               sql_partition.cc sql_plugin.cc sql_prepare.cc sql_rename.cc 
+               sql_error.cc sql_handler.cc sql_help.cc sql_insert.cc
+               sql_join_cache.cc sql_lex.cc sql_list.cc sql_load.cc sql_manager.cc
+               sql_map.cc sql_parse.cc  sql_partition.cc sql_plugin.cc
+               sql_prepare.cc sql_rename.cc 
                sql_repl.cc sql_select.cc sql_show.cc sql_state.c sql_string.cc 
                sql_table.cc sql_test.cc sql_trigger.cc sql_udf.cc sql_union.cc
                sql_update.cc sql_view.cc strfunc.cc table.cc thr_malloc.cc 

=== modified file 'sql/Makefile.am'
--- a/sql/Makefile.am	2009-12-15 07:16:46 +0000
+++ b/sql/Makefile.am	2009-12-21 02:26:15 +0000
@@ -91,6 +91,7 @@ mysqld_SOURCES =	ds_mrr.cc sql_lex.cc sq
 			mysqld.cc password.c hash_filo.cc hostname.cc \
 			sql_connect.cc scheduler.cc sql_parse.cc \
 			set_var.cc sql_yacc.yy \
+                        sql_join_cache.cc \
 			sql_base.cc table.cc sql_select.cc sql_insert.cc \
 			sql_profile.cc \
 			sql_prepare.cc sql_error.cc sql_locale.cc \

=== modified file 'sql/ds_mrr.cc'
--- a/sql/ds_mrr.cc	2009-12-15 17:23:55 +0000
+++ b/sql/ds_mrr.cc	2009-12-21 02:26:15 +0000
@@ -990,9 +990,6 @@ void push_index_cond(JOIN_TAB *tab, uint
     {
       Item *idx_remainder_cond= 0;
       tab->pre_idx_push_select_cond= tab->select_cond;
-#if 0
-      /* 
-        psergey: enable the below when we backport BKA: */
       /*
         For BKA cache we store condition to special BKA cache field
         because evaluation of the condition requires additional operations
@@ -1011,7 +1008,6 @@ void push_index_cond(JOIN_TAB *tab, uint
            ~(tab->table->map | tab->join->const_table_map)))
         tab->cache_idx_cond= idx_cond;
       else
-#endif
         idx_remainder_cond= tab->table->file->idx_cond_push(keyno, idx_cond);
 
       /*

=== modified file 'sql/field.cc'
--- a/sql/field.cc	2009-11-10 02:32:39 +0000
+++ b/sql/field.cc	2009-12-21 02:26:15 +0000
@@ -1705,13 +1705,12 @@ my_decimal *Field_str::val_decimal(my_de
 uint Field::fill_cache_field(CACHE_FIELD *copy)
 {
   uint store_length;
-  copy->str=ptr;
-  copy->length=pack_length();
-  copy->blob_field=0;
+  copy->str= ptr;
+  copy->length= pack_length();
+  copy->field= this;  
   if (flags & BLOB_FLAG)
   {
-    copy->blob_field=(Field_blob*) this;
-    copy->strip=0;
+    copy->type= CACHE_BLOB;
     copy->length-= table->s->blob_ptr_size;
     return copy->length;
   }
@@ -1719,15 +1718,21 @@ uint Field::fill_cache_field(CACHE_FIELD
            (type() == MYSQL_TYPE_STRING && copy->length >= 4 &&
             copy->length < 256))
   {
-    copy->strip=1;				/* Remove end space */
+    copy->type= CACHE_STRIPPED;			    /* Remove end space */
     store_length= 2;
   }
+  else if (type() ==  MYSQL_TYPE_VARCHAR)
+  {
+    copy->type= pack_length()-row_pack_length() == 1 ? CACHE_VARSTR1:
+                                                      CACHE_VARSTR2;
+    store_length= 0;
+  }
   else
   {
-    copy->strip=0;
+    copy->type= 0;
     store_length= 0;
   }
-  return copy->length+ store_length;
+  return copy->length+store_length;
 }
 
 

=== modified file 'sql/item.cc'
--- a/sql/item.cc	2009-11-10 02:32:39 +0000
+++ b/sql/item.cc	2009-12-21 02:26:15 +0000
@@ -646,6 +646,16 @@ bool Item_field::collect_item_field_proc
 }
 
 
+bool Item_field::add_field_to_set_processor(uchar *arg)
+{
+  DBUG_ENTER("Item_field::add_field_to_set_processor");
+  DBUG_PRINT("info", ("%s", field->field_name ? field->field_name : "noname"));
+  TABLE *table= (TABLE *) arg;
+  if (field->table == table)
+    bitmap_set_bit(&table->tmp_set, field->field_index);
+  DBUG_RETURN(FALSE);
+}
+
 /**
   Check if an Item_field references some field from a list of fields.
 

=== modified file 'sql/item.h'
--- a/sql/item.h	2009-12-15 07:16:46 +0000
+++ b/sql/item.h	2009-12-21 02:26:15 +0000
@@ -913,6 +913,7 @@ public:
   virtual bool remove_fixed(uchar * arg) { fixed= 0; return 0; }
   virtual bool cleanup_processor(uchar *arg);
   virtual bool collect_item_field_processor(uchar * arg) { return 0; }
+  virtual bool add_field_to_set_processor(uchar * arg) { return 0; }
   virtual bool find_item_in_field_list_processor(uchar *arg) { return 0; }
   virtual bool change_context_processor(uchar *context) { return 0; }
   virtual bool reset_query_id_processor(uchar *query_id_arg) { return 0; }
@@ -1571,6 +1572,7 @@ public:
   void update_null_value();
   Item *get_tmp_table_item(THD *thd);
   bool collect_item_field_processor(uchar * arg);
+  bool add_field_to_set_processor(uchar * arg);
   bool find_item_in_field_list_processor(uchar *arg);
   bool register_field_in_read_map(uchar *arg);
   bool register_field_in_bitmap(uchar *arg);

=== modified file 'sql/mysqld.cc'
--- a/sql/mysqld.cc	2009-12-15 07:16:46 +0000
+++ b/sql/mysqld.cc	2009-12-21 02:26:15 +0000
@@ -5754,7 +5754,7 @@ enum options_mysqld
   OPT_DELAYED_INSERT_LIMIT, OPT_DELAYED_QUEUE_SIZE,
   OPT_FLUSH_TIME, OPT_FT_MIN_WORD_LEN, OPT_FT_BOOLEAN_SYNTAX,
   OPT_FT_MAX_WORD_LEN, OPT_FT_QUERY_EXPANSION_LIMIT, OPT_FT_STOPWORD_FILE,
-  OPT_INTERACTIVE_TIMEOUT, OPT_JOIN_BUFF_SIZE,
+  OPT_INTERACTIVE_TIMEOUT, OPT_JOIN_BUFF_SIZE, OPT_JOIN_CACHE_LEVEL,
   OPT_KEY_BUFFER_SIZE, OPT_KEY_CACHE_BLOCK_SIZE,
   OPT_KEY_CACHE_DIVISION_LIMIT, OPT_KEY_CACHE_AGE_THRESHOLD,
   OPT_LONG_QUERY_TIME,
@@ -6804,8 +6804,13 @@ log and this option does nothing anymore
    "The size of the buffer that is used for full joins.",
    (uchar**) &global_system_variables.join_buff_size,
    (uchar**) &max_system_variables.join_buff_size, 0, GET_ULONG,
-   REQUIRED_ARG, 128*1024L, IO_SIZE*2+MALLOC_OVERHEAD, (longlong) ULONG_MAX,
-   MALLOC_OVERHEAD, IO_SIZE, 0},
+   REQUIRED_ARG, 128*1024L, 128+MALLOC_OVERHEAD, (longlong) ULONG_MAX,
+   MALLOC_OVERHEAD, 128, 0},
+   {"join_cache_level", OPT_JOIN_CACHE_LEVEL,
+   "Controls what join operations can be executed with join buffers. Odd numbers are used for plain join buffers while even numbers are used for linked buffers",
+   (uchar**) &global_system_variables.join_cache_level,
+   (uchar**) &max_system_variables.join_cache_level,
+   0, GET_ULONG, REQUIRED_ARG, 1, 0, 8, 0, 1, 0},
   {"keep_files_on_create", OPT_KEEP_FILES_ON_CREATE,
    "Don't overwrite stale .MYD and .MYI even if no directory is specified.",
    (uchar**) &global_system_variables.keep_files_on_create,

=== modified file 'sql/set_var.cc'
--- a/sql/set_var.cc	2009-12-15 07:16:46 +0000
+++ b/sql/set_var.cc	2009-12-21 02:26:15 +0000
@@ -313,6 +313,8 @@ static sys_var_thd_ulong	sys_interactive
 						&SV::net_interactive_timeout);
 static sys_var_thd_ulong	sys_join_buffer_size(&vars, "join_buffer_size",
 					     &SV::join_buff_size);
+static sys_var_thd_ulong	sys_join_cache_level(&vars, "join_cache_level",
+					             &SV::join_cache_level);
 static sys_var_key_buffer_size	sys_key_buffer_size(&vars, "key_buffer_size");
 static sys_var_key_cache_long  sys_key_cache_block_size(&vars, "key_cache_block_size",
 						 offsetof(KEY_CACHE,

=== modified file 'sql/sql_class.h'
--- a/sql/sql_class.h	2009-12-15 07:16:46 +0000
+++ b/sql/sql_class.h	2009-12-21 02:26:15 +0000
@@ -306,6 +306,7 @@ struct system_variables
   ulong auto_increment_increment, auto_increment_offset;
   ulong bulk_insert_buff_size;
   ulong join_buff_size;
+  ulong join_cache_level;
   ulong max_allowed_packet;
   ulong max_error_count;
   ulong max_length_for_sort_data;

=== added file 'sql/sql_join_cache.cc'
--- a/sql/sql_join_cache.cc	1970-01-01 00:00:00 +0000
+++ b/sql/sql_join_cache.cc	2009-12-21 02:26:15 +0000
@@ -0,0 +1,3279 @@
+/* Copyright (C) 2000-2006 MySQL AB
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; version 2 of the License.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */
+
+/**
+  @file
+
+  @brief
+  join cache optimizations
+
+  @defgroup Query_Optimizer  Query Optimizer
+  @{
+*/
+
+#ifdef USE_PRAGMA_IMPLEMENTATION
+#pragma implementation				// gcc: Class implementation
+#endif
+
+#include "mysql_priv.h"
+#include "sql_select.h"
+
+
+/*****************************************************************************
+ *  Join cache module
+******************************************************************************/
+
+/* 
+  Fill in the descriptor of a flag field associated with a join cache    
+
+  SYNOPSIS
+    add_field_flag_to_join_cache()
+      str           position in a record buffer to copy the field from/to
+      length        length of the field 
+      field  IN/OUT pointer to the field descriptor to fill in 
+
+  DESCRIPTION
+    The function fill in the descriptor of a cache flag field to which
+    the parameter 'field' points to. The function uses the first two
+    parameters to set the position in the record buffer from/to which 
+    the field value is to be copied and the length of the copied fragment. 
+    Before returning the result the function increments the value of
+    *field by 1.
+    The function ignores the fields 'blob_length' and 'ofset' of the
+    descriptor.
+
+  RETURN
+    the length of the field  
+*/
+
+static
+uint add_flag_field_to_join_cache(uchar *str, uint length, CACHE_FIELD **field)
+{
+  CACHE_FIELD *copy= *field;
+  copy->str= str;
+  copy->length= length;
+  copy->type= 0;
+  copy->field= 0;
+  copy->referenced_field_no= 0;
+  (*field)++;
+  return length;    
+}
+
+
+/* 
+  Fill in the descriptors of table data fields associated with a join cache    
+
+  SYNOPSIS
+    add_table_data_fields_to_join_cache()
+      tab              descriptors of fields from this table are to be filled
+      field_set        descriptors for only these fields are to be created
+      field_cnt IN/OUT     counter of data fields  
+      descr  IN/OUT        pointer to the first descriptor to be filled
+      field_ptr_cnt IN/OUT counter of pointers to the data fields
+      descr_ptr IN/OUT     pointer to the first pointer to blob descriptors 
+
+  DESCRIPTION
+    The function fills in the descriptors of cache data fields from the table
+    'tab'. The descriptors are filled only for the fields marked in the 
+    bitmap 'field_set'. 
+    The function fills the descriptors starting from the position pointed
+    by 'descr'. If an added field is of a BLOB type then a pointer to the 
+    its descriptor is added to the array descr_ptr.   
+    At the return 'descr' points to the position after the last added
+    descriptor  while 'descr_ptr' points to the position right after the
+    last added pointer.  
+
+  RETURN
+    the total length of the added fields  
+*/
+
+static
+uint add_table_data_fields_to_join_cache(JOIN_TAB *tab, 
+                                         MY_BITMAP *field_set,
+                                         uint *field_cnt, 
+                                         CACHE_FIELD **descr,
+                                         uint *field_ptr_cnt,
+                                         CACHE_FIELD ***descr_ptr)
+{
+  Field **fld_ptr;
+  uint len= 0;
+  CACHE_FIELD *copy= *descr;
+  CACHE_FIELD **copy_ptr= *descr_ptr;
+  uint used_fields= bitmap_bits_set(field_set);
+  for (fld_ptr= tab->table->field; used_fields; fld_ptr++)
+  {
+    if (bitmap_is_set(field_set, (*fld_ptr)->field_index))
+    {
+      len+= (*fld_ptr)->fill_cache_field(copy);
+      if (copy->type == CACHE_BLOB)
+      {
+        *copy_ptr= copy;
+        copy_ptr++;
+        (*field_ptr_cnt)++;
+      }
+      copy->field= *fld_ptr;
+      copy->referenced_field_no= 0;
+      copy++;
+      (*field_cnt)++;
+      used_fields--;
+    }
+  }
+  *descr= copy;
+  *descr_ptr= copy_ptr;
+  return len;
+}
+    
+
+/* 
+  Determine different counters of fields associated with a record in the cache  
+
+  SYNOPSIS
+    calc_record_fields()
+
+  DESCRIPTION
+    The function counts the number of total fields stored in a record
+    of the cache and saves this number in the 'fields' member. It also
+    determines the number of flag fields and the number of blobs.
+    The function sets 'with_match_flag' on if 'join_tab' needs a match flag
+    i.e. if it is the first inner table of an outer join or a semi-join.  
+
+  RETURN
+    none 
+*/
+
+void JOIN_CACHE::calc_record_fields()
+{
+  JOIN_TAB *tab = prev_cache ? prev_cache->join_tab :
+                               join->join_tab+join->const_tables;
+  tables= join_tab-tab;
+
+  fields= 0;
+  blobs= 0;
+  flag_fields= 0;
+  data_field_count= 0;
+  data_field_ptr_count= 0;
+  referenced_fields= 0;
+
+  for ( ; tab < join_tab ; tab++)
+  {	    
+    calc_used_field_length(join->thd, tab);
+    flag_fields+= test(tab->used_null_fields || tab->used_uneven_bit_fields);
+    flag_fields+= test(tab->table->maybe_null);
+    fields+= tab->used_fields;
+    blobs+= tab->used_blobs;
+
+    fields+= tab->check_rowid_field();
+  }
+  if ((with_match_flag= join_tab->use_match_flag()))
+    flag_fields++;
+  fields+= flag_fields;
+}
+
+/* 
+  Allocate memory for descriptors and pointers to them associated with the cache  
+
+  SYNOPSIS
+    alloc_fields()
+
+  DESCRIPTION
+    The function allocates memory for the array of fields descriptors
+    and the array of pointers to the field descriptors used to copy
+    join record data from record buffers into the join buffer and
+    backward. Some pointers refer to the field descriptor associated
+    with previous caches. They are placed at the beginning of the
+    array of pointers and its total number is specified by the parameter
+    'external fields'.
+    The pointer of the first array is assigned to field_descr and the 
+    number of elements is precalculated by the function calc_record_fields. 
+    The allocated arrays are adjacent.
+  
+  NOTES
+    The memory is allocated in join->thd->memroot
+
+  RETURN
+    pointer to the first array  
+*/
+
+int JOIN_CACHE::alloc_fields(uint external_fields)
+{
+  uint ptr_cnt= external_fields+blobs+1;
+  uint fields_size= sizeof(CACHE_FIELD)*fields;
+  field_descr= (CACHE_FIELD*) sql_alloc(fields_size +
+                                        sizeof(CACHE_FIELD*)*ptr_cnt);
+  blob_ptr= (CACHE_FIELD **) ((uchar *) field_descr + fields_size);
+  return (field_descr == NULL);
+}  
+
+/* 
+  Create descriptors of the record flag fields stored in the join buffer 
+
+  SYNOPSIS
+    create_flag_fields()
+
+  DESCRIPTION
+    The function creates descriptors of the record flag fields stored
+    in the join buffer. These are descriptors for:
+    - an optional match flag field,
+    - table null bitmap fields, 
+    - table null row fields.
+    The match flag field is created when 'join_tab' is the first inner
+    table of an outer join our a semi-join. A null bitmap field is
+    created for any table whose fields are to be stored in the join
+    buffer if at least one of these fields is nullable or is a BIT field
+    whose bits are partially stored with null bits. A null row flag
+    is created for any table assigned to the cache if it is an inner
+    table of an outer join.
+    The descriptor for flag fields are placed one after another at the
+    beginning of the array of field descriptors 'field_descr' that
+    contains 'fields' elements. If there is a match flag field the 
+    descriptor for it is always first in the sequence of flag fields.
+    The descriptors for other flag fields can follow in an arbitrary
+    order. 
+    The flag field values follow in a record stored in the join buffer
+    in the same order as field descriptors, with the match flag always
+    following first.
+    The function sets the value of 'flag_fields' to the total number
+    of the descriptors created for the flag fields.
+    The function sets the value of 'length' to the total length of the
+    flag fields.
+  
+  RETURN
+    none
+*/
+
+void JOIN_CACHE::create_flag_fields()
+{
+  CACHE_FIELD *copy;
+  JOIN_TAB *tab;
+
+  copy= field_descr;
+
+  length=0;
+
+  /* If there is a match flag the first field is always used for this flag */ 
+  if (with_match_flag)
+    length+= add_flag_field_to_join_cache((uchar*) &join_tab->found,
+                                          sizeof(join_tab->found),
+	                                  &copy);
+
+  /* Create fields for all null bitmaps and null row flags that are needed */
+  for (tab= join_tab-tables; tab < join_tab; tab++)
+  {
+    TABLE *table= tab->table;
+
+    /* Create a field for the null bitmap from table if needed */
+    if (tab->used_null_fields || tab->used_uneven_bit_fields)			    
+      length+= add_flag_field_to_join_cache(table->null_flags,
+                                            table->s->null_bytes,
+                                            &copy);
+ 
+    /* Create table for the null row flag if needed */
+    if (table->maybe_null)
+      length+= add_flag_field_to_join_cache((uchar*) &table->null_row,
+                                            sizeof(table->null_row),
+                                            &copy);
+  }
+
+  /* Theoretically the new value of flag_fields can be less than the old one */   
+  flag_fields= copy-field_descr;
+}
+
+
+/* 
+  Create descriptors of all remaining data fields stored in the join buffer    
+
+  SYNOPSIS
+    create_remaining_fields()
+      all_read_fields   indicates that descriptors for all read data fields
+                        are to be created
+
+  DESCRIPTION
+    The function creates descriptors for all remaining data fields of a
+    record from the join buffer. If the parameter 'all_read_fields' is
+    true the function creates fields for all read record fields that
+    comprise the partial join record joined with join_tab. Otherwise, 
+    for each table tab, the set of the read fields for which the descriptors
+    have to be added is determined as the difference between all read fields
+    and and those for which the descriptors have been already created.
+    The latter are supposed to be marked in the bitmap tab->table->tmp_set.
+    The function increases the value of 'length' to the the total length of
+    the added fields.
+   
+  NOTES
+    If 'all_read_fields' is false the function modifies the value of
+    tab->table->tmp_set for a each table whose fields are stored in the cache.
+    The function calls the method Field::fill_cache_field to figure out
+    the type of the cache field and the maximal length of its representation
+    in the join buffer. If this is a blob field then additionally a pointer
+    to this field is added as an element of the array blob_ptr. For a blob
+    field only the size of the length of the blob data is taken into account.
+    It is assumed that 'data_field_count' contains the number of descriptors
+    for data fields that have been already created and 'data_field_ptr_count'
+    contains the number of the pointers to such descriptors having been
+    stored up to the moment.
+
+  RETURN
+    none 
+*/
+
+void JOIN_CACHE:: create_remaining_fields(bool all_read_fields)
+{
+  JOIN_TAB *tab;
+  CACHE_FIELD *copy= field_descr+flag_fields+data_field_count;
+  CACHE_FIELD **copy_ptr= blob_ptr+data_field_ptr_count;
+
+  for (tab= join_tab-tables; tab < join_tab; tab++)
+  {
+    MY_BITMAP *rem_field_set;
+    TABLE *table= tab->table;
+
+    if (all_read_fields)
+      rem_field_set= table->read_set;
+    else
+    {
+      bitmap_invert(&table->tmp_set);
+      bitmap_intersect(&table->tmp_set, table->read_set);
+      rem_field_set= &table->tmp_set;
+    }  
+
+    length+= add_table_data_fields_to_join_cache(tab, rem_field_set,
+                                                 &data_field_count, &copy,
+                                                 &data_field_ptr_count,
+                                                 &copy_ptr);
+  
+    /* SemiJoinDuplicateElimination: allocate space for rowid if needed */
+/* !!! NB igor: Enable the code in the comment after backporting the SJ code
+    if (tab->keep_current_rowid)
+    {
+      copy->str= table->file->ref;
+      copy->length= table->file->ref_length;
+      copy->type= 0;
+      copy->field= 0;
+      copy->referenced_field_no= 0;
+      length+= copy->length;
+      data_field_count++;
+      copy++;
+    }
+*/
+  }
+}
+
+
+/* 
+  Calculate and set all cache constants      
+
+  SYNOPSIS
+    set_constants()
+
+  DESCRIPTION
+    The function calculates and set all precomputed constants that are used
+    when writing records into the join buffer and reading them from it.
+    It calculates the size of offsets of a record within the join buffer
+    and of a field within a record. It also calculates the number of bytes
+    used to store record lengths.
+    The function also calculates the maximal length of the representation
+    of record in the cache excluding blob_data. This value is used when
+    making a dicision whether more records should be added into the join
+    buffer or not.
+  
+  RETURN
+    none 
+*/
+
+void JOIN_CACHE::set_constants()
+{ 
+  /* 
+    Any record from a BKA cache is prepended with the record length.
+    We use the record length when reading the buffer and building key values
+    for each record. The length allows us not to read the fields that are
+    not needed for keys.
+    If a record has match flag it also may be skipped when the match flag
+    is on. It happens if the cache is used for a semi-join operation or
+    for outer join when the 'not exist' optimization can be applied.
+    If some of the fields are referenced from other caches then
+    the record length allows us to easily reach the saved offsets for
+    these fields since the offsets are stored at the very end of the record.
+    However at this moment we don't know whether we have referenced fields for
+    the cache or not. Later when a referenced field is registered for the cache
+    we adjust the value of the flag 'with_length'.
+  */        
+  with_length= is_key_access() || with_match_flag;
+  /* 
+     At this moment we don't know yet the value of 'referenced_fields',
+     but in any case it can't be greater than the value of 'fields'.
+  */
+  uint len= length + fields*sizeof(uint)+blobs*sizeof(uchar *) +
+            (prev_cache ? prev_cache->get_size_of_rec_offset() : 0) +
+            sizeof(ulong);
+  buff_size= max(join->thd->variables.join_buff_size, 2*len);
+  size_of_rec_ofs= offset_size(buff_size);
+  size_of_rec_len= blobs ? size_of_rec_ofs : offset_size(len); 
+  size_of_fld_ofs= size_of_rec_len;
+  /* 
+    The size of the offsets for referenced fields will be added later.
+    The values of 'pack_length' and 'pack_length_with_blob_ptrs' are adjusted
+    every time when the first reference to the referenced field is registered.
+  */
+  pack_length= (with_length ? size_of_rec_len : 0) +
+               (prev_cache ? prev_cache->get_size_of_rec_offset() : 0) + 
+               length;
+  pack_length_with_blob_ptrs= pack_length + blobs*sizeof(uchar *);
+}
+
+
+/* 
+  Allocate memory for a join buffer      
+
+  SYNOPSIS
+    alloc_buffer()
+
+  DESCRIPTION
+    The function allocates a lump of memory for the cache join buffer. The
+    size of the allocated memory is 'buff_size' bytes. 
+  
+  RETURN
+    0 - if the memory has been successfully allocated
+    1 - otherwise
+*/
+
+int JOIN_CACHE::alloc_buffer()
+{
+  buff= (uchar*) my_malloc(buff_size, MYF(0));
+  return buff == NULL;
+}    	
+  
+
+/* 
+  Initialize a BNL cache       
+
+  SYNOPSIS
+    init()
+
+  DESCRIPTION
+    The function initializes the cache structure. It supposed to be called
+    right after a constructor for the JOIN_CACHE_BNL.
+    The function allocates memory for the join buffer and for descriptors of
+    the record fields stored in the buffer.
+
+  NOTES
+    The code of this function should have been included into the constructor
+    code itself. However the new operator for the class JOIN_CACHE_BNL would
+    never fail while memory allocation for the join buffer is not absolutely
+    unlikely to fail. That's why this memory allocation has to be placed in a
+    separate function that is called in a couple with a cache constructor.
+    It is quite natural to put almost all other constructor actions into
+    this function.     
+  
+  RETURN
+    0   initialization with buffer allocations has been succeeded
+    1   otherwise
+*/
+
+int JOIN_CACHE_BNL::init()
+{
+  DBUG_ENTER("JOIN_CACHE::init");
+
+  calc_record_fields();
+
+  if (alloc_fields(0))
+    DBUG_RETURN(1);
+
+  create_flag_fields();
+  
+  create_remaining_fields(TRUE);
+
+  set_constants();
+
+  if (alloc_buffer())
+    DBUG_RETURN(1); 
+  
+  reset(TRUE); 
+
+  DBUG_RETURN(0);
+}
+
+
+/* 
+  Initialize a BKA cache       
+
+  SYNOPSIS
+    init()
+
+  DESCRIPTION
+    The function initializes the cache structure. It supposed to be called
+    right after a constructor for the JOIN_CACHE_BKA.
+    The function allocates memory for the join buffer and for descriptors of
+    the record fields stored in the buffer.
+
+  NOTES
+    The code of this function should have been included into the constructor
+    code itself. However the new operator for the class JOIN_CACHE_BKA would
+    never fail while memory allocation for the join buffer is not absolutely
+    unlikely to fail. That's why this memory allocation has to be placed in a
+    separate function that is called in a couple with a cache constructor.
+    It is quite natural to put almost all other constructor actions into
+    this function.     
+  
+  RETURN
+    0   initialization with buffer allocations has been succeeded
+    1   otherwise
+*/
+
+int JOIN_CACHE_BKA::init()
+{
+  JOIN_TAB *tab;
+  JOIN_CACHE *cache;
+  local_key_arg_fields= 0;
+  external_key_arg_fields= 0;
+  DBUG_ENTER("JOIN_CACHE_BKA::init");
+
+  calc_record_fields();
+
+  /* Mark all fields that can be used as arguments for this key access */
+  TABLE_REF *ref= &join_tab->ref;
+  cache= this;
+  do
+  {
+    /* 
+      Traverse the ref expressions and find the occurrences of fields in them for
+      each table 'tab' whose fields are to be stored in the 'cache' join buffer.
+      Mark these fields in the bitmap tab->table->tmp_set.
+      For these fields count the number of them stored in this cache and the
+      total number of them stored in the previous caches. Save the result
+      of the counting 'in local_key_arg_fields' and 'external_key_arg_fields'
+      respectively.
+    */ 
+    for (tab= cache->join_tab-cache->tables; tab < cache->join_tab ; tab++)
+    { 
+      uint key_args;
+      bitmap_clear_all(&tab->table->tmp_set);
+      for (uint i= 0; i < ref->key_parts; i++)
+      {
+        Item *ref_item= ref->items[i]; 
+        if (!(tab->table->map & ref_item->used_tables()))
+	  continue;
+	 ref_item->walk(&Item::add_field_to_set_processor, 1,
+                        (uchar *) tab->table);
+      }
+      if ((key_args= bitmap_bits_set(&tab->table->tmp_set)))
+      {
+        if (cache == this)
+          local_key_arg_fields+= key_args;
+        else
+          external_key_arg_fields+= key_args;
+      }
+    }
+    cache= cache->prev_cache;
+  } 
+  while (cache);
+
+  if (alloc_fields(external_key_arg_fields))
+    DBUG_RETURN(1);
+
+  create_flag_fields();
+  
+  /* 
+    Save pointers to the cache fields in previous caches
+    that  are used to build keys for this key access.
+  */
+  cache= this;
+  uint ext_key_arg_cnt= external_key_arg_fields;
+  CACHE_FIELD *copy;
+  CACHE_FIELD **copy_ptr= blob_ptr;
+  while (ext_key_arg_cnt)
+  {
+    cache= cache->prev_cache;
+    for (tab= cache->join_tab-cache->tables; tab < cache->join_tab ; tab++)
+    { 
+      CACHE_FIELD *copy_end;
+      MY_BITMAP *key_read_set= &tab->table->tmp_set;
+      /* key_read_set contains the bitmap of tab's fields referenced by ref */ 
+      if (bitmap_is_clear_all(key_read_set))
+        continue;
+      copy_end= cache->field_descr+cache->fields;
+      for (copy= cache->field_descr+cache->flag_fields; copy < copy_end; copy++)
+      {
+        if (copy->field->table == tab->table &&
+            bitmap_is_set(key_read_set, copy->field->field_index))
+        {
+          *copy_ptr++= copy; 
+          ext_key_arg_cnt--;
+          if (!copy->referenced_field_no)
+          {
+            /* 
+              Register the referenced field 'copy': 
+              - set the offset number in copy->referenced_field_no,
+              - adjust the value of the flag 'with_length',
+              - adjust the values of 'pack_length' and 
+                of 'pack_length_with_blob_ptrs'.
+	    */
+            copy->referenced_field_no= ++cache->referenced_fields;
+            cache->with_length= TRUE;
+	    cache->pack_length+= cache->get_size_of_fld_offset();
+            cache->pack_length_with_blob_ptrs+= cache->get_size_of_fld_offset();
+          }        
+        }
+      }
+    } 
+  }
+  /* After this 'blob_ptr' shall not be be changed */ 
+  blob_ptr= copy_ptr;
+  
+  /* Now create local fields that are used to build ref for this key access */
+  copy= field_descr+flag_fields;
+  for (tab= join_tab-tables; tab < join_tab ; tab++)
+  {
+    length+= add_table_data_fields_to_join_cache(tab, &tab->table->tmp_set,
+                                                 &data_field_count, &copy,
+                                                 &data_field_ptr_count, 
+                                                 &copy_ptr);
+  }
+
+  use_emb_key= check_emb_key_usage();
+
+  create_remaining_fields(FALSE);
+
+  set_constants();
+
+  if (alloc_buffer())
+    DBUG_RETURN(1); 
+
+  reset(TRUE);
+
+  DBUG_RETURN(0);
+}  
+
+
+/* 
+  Check the possibility to read the access keys directly from the join buffer       
+
+  SYNOPSIS
+    check_emb_key_usage()
+
+  DESCRIPTION
+    The function checks some conditions at which the key values can be read
+    directly from the join buffer. This is possible when the key values can be
+    composed by concatenation of the record fields stored in the join buffer.
+    Sometimes when the access key is multi-component the function has to re-order
+    the fields written into the join buffer to make keys embedded. If key 
+    values for the key access are detected as embedded then 'use_emb_key'
+    is set to TRUE.
+
+  EXAMPLE
+    Let table t2 has an index defined on the columns a,b . Let's assume also
+    that the columns t2.a, t2.b as well as the columns t1.a, t1.b are all
+    of the integer type. Then if the query
+      SELECT COUNT(*) FROM t1, t2 WHERE t1.a=t2.a and t1.b=t2.b  
+    is executed with a join cache in such a way that t1 is the driving
+    table then the key values to access table t2 can be read directly
+    from the join buffer.
+  
+  NOTES
+    In some cases key values could be read directly from the join buffer but
+    we still do not consider them embedded. In the future we'll expand the
+    the class of keys which we identify as embedded.
+
+  RETURN
+    TRUE  - key values will be considered as embedded,
+    FALSE - otherwise.
+*/
+
+bool JOIN_CACHE_BKA::check_emb_key_usage()
+{
+  uint i;
+  Item *item; 
+  KEY_PART_INFO *key_part;
+  CACHE_FIELD *copy;
+  CACHE_FIELD *copy_end;
+  uint len= 0;
+  TABLE *table= join_tab->table;
+  TABLE_REF *ref= &join_tab->ref;
+  KEY *keyinfo= table->key_info+ref->key;
+
+  /* 
+    If some of the key arguments are not from the local cache the key
+    is not considered as embedded.
+    TODO:
+    Expand it to the case when ref->key_parts=1 and local_key_arg_fields=0.
+  */  
+  if (external_key_arg_fields != 0)
+    return FALSE;
+  /* 
+    If the number of the local key arguments is not equal to the number
+    of key parts the key value cannot be read directly from the join buffer.   
+  */
+  if (local_key_arg_fields != ref->key_parts)
+    return FALSE;
+
+  /* 
+    A key is not considered embedded if one of the following is true:
+    - one of its key parts is not equal to a field
+    - it is a partial key
+    - definition of the argument field does not coincide with the
+      definition of the corresponding key component
+    - some of the key components are nullable
+  */  
+  for (i=0; i < ref->key_parts; i++)
+  {
+    item= ref->items[i]->real_item();
+    if (item->type() != Item::FIELD_ITEM)
+      return FALSE;
+    key_part= keyinfo->key_part+i;
+    if (key_part->key_part_flag & HA_PART_KEY_SEG)
+      return FALSE;
+    if (!key_part->field->eq_def(((Item_field *) item)->field))
+      return FALSE;
+    if (key_part->field->maybe_null())
+      return FALSE;
+  }
+  
+  copy= field_descr+flag_fields;
+  copy_end= copy+local_key_arg_fields;
+  for ( ; copy < copy_end; copy++)
+  {
+    /* 
+      If some of the key arguments are of variable length the key
+      is not considered as embedded.
+    */
+    if (copy->type != 0)
+      return FALSE;
+    /* 
+      If some of the key arguments are bit fields whose bits are partially
+      stored with null bits the key is not considered as embedded.
+    */
+    if (copy->field->type() == MYSQL_TYPE_BIT &&
+	 ((Field_bit*) (copy->field))->bit_len)
+      return FALSE;
+    len+= copy->length;
+  }
+
+  emb_key_length= len;
+
+  /* 
+    Make sure that key fields follow the order of the corresponding
+    key components these fields are equal to. For this the descriptors
+    of the fields that comprise the key might be re-ordered.
+  */
+  for (i= 0; i < ref->key_parts; i++)
+  {
+    uint j;
+    Item *item= ref->items[i]->real_item();
+    Field *fld= ((Item_field *) item)->field;
+    CACHE_FIELD *init_copy= field_descr+flag_fields+i; 
+    for (j= i, copy= init_copy; i < local_key_arg_fields;  i++, copy++)
+    {
+      if (fld->eq(copy->field))
+      {
+        if (j != i)
+        {
+          CACHE_FIELD key_part_copy= *copy;
+          *copy= *init_copy;
+          *init_copy= key_part_copy;
+        }
+        break;
+      }
+    }
+  }
+
+  return TRUE;
+}    
+
+
+/* 
+  Calculate the increment of the MRR buffer for a record write       
+
+  SYNOPSIS
+    aux_buffer_incr()
+
+  DESCRIPTION
+    This implementation of the virtual function aux_buffer_incr determines
+    for how much the size of the MRR buffer should be increased when another
+    record is added to the cache.   
+
+  RETURN
+    the increment of the size of the MRR buffer for the next record
+*/
+
+uint JOIN_CACHE_BKA::aux_buffer_incr()
+{
+  uint incr= 0;
+  TABLE_REF *ref= &join_tab->ref;
+  TABLE *tab= join_tab->table;
+  uint rec_per_key= tab->key_info[ref->key].rec_per_key[ref->key_parts-1];
+  set_if_bigger(rec_per_key, 1);
+  if (records == 1)
+    incr=  ref->key_length + tab->file->ref_length;
+  incr+= tab->file->stats.mrr_length_per_rec * rec_per_key;
+  return incr; 
+}
+
+
+/*
+  Check if the record combination matches the index condition
+
+  SYNOPSIS
+    JOIN_CACHE_BKA::skip_index_tuple()
+      rseq             Value returned by bka_range_seq_init()
+      range_info       MRR range association data
+    
+  DESCRIPTION
+    This function is invoked from MRR implementation to check if an index
+    tuple matches the index condition. It is used in the case where the index
+    condition actually depends on both columns of the used index and columns
+    from previous tables.
+    
+    Accessing columns of the previous tables requires special handling with
+    BKA. The idea of BKA is to collect record combinations in a buffer and 
+    then do a batch of ref access lookups, i.e. by the time we're doing a
+    lookup its previous-records-combination is not in prev_table->record[0]
+    but somewhere in the join buffer.
+    
+    We need to get it from there back into prev_table(s)->record[0] before we
+    can evaluate the index condition, and that's why we need this function
+    instead of regular IndexConditionPushdown.
+
+  NOTE
+    Possible optimization:
+    Before we unpack the record from a previous table
+    check if this table is used in the condition.
+    If so then unpack the record otherwise skip the unpacking.
+    This should be done by a special virtual method
+    get_partial_record_by_pos().
+
+  RETURN
+    0    The record combination satisfies the index condition
+    1    Otherwise
+*/
+
+bool JOIN_CACHE_BKA::skip_index_tuple(range_seq_t rseq, char *range_info)
+{
+  DBUG_ENTER("JOIN_CACHE_BKA::skip_index_tuple");
+  JOIN_CACHE_BKA *cache= (JOIN_CACHE_BKA *) rseq;
+  cache->get_record_by_pos((uchar*)range_info);
+  DBUG_RETURN(!join_tab->cache_idx_cond->val_int());
+}
+
+
+/*
+  Check if the record combination matches the index condition
+
+  SYNOPSIS
+    bka_skip_index_tuple()
+      rseq             Value returned by bka_range_seq_init()
+      range_info       MRR range association data
+    
+  DESCRIPTION
+    This is wrapper for JOIN_CACHE_BKA::skip_index_tuple method,
+    see comments there.
+
+  NOTE
+    This function is used as a RANGE_SEQ_IF::skip_index_tuple callback.
+ 
+  RETURN
+    0    The record combination satisfies the index condition
+    1    Otherwise
+*/
+
+static 
+bool bka_skip_index_tuple(range_seq_t rseq, char *range_info)
+{
+  DBUG_ENTER("bka_skip_index_tuple");
+  JOIN_CACHE_BKA *cache= (JOIN_CACHE_BKA *) rseq;
+  DBUG_RETURN(cache->skip_index_tuple(rseq, range_info));
+}
+
+
+/* 
+  Write record fields and their required offsets into the join cache buffer
+
+  SYNOPSIS
+    write_record_data()
+      link        a reference to the associated info in the previous cache
+      is_full OUT true if it has been decided that no more records will be
+                  added to the join buffer
+
+  DESCRIPTION
+    This function put into the cache buffer the following info that it reads
+    from the join record buffers or computes somehow:
+    (1) the length of all fields written for the record (optional)
+    (2) an offset to the associated info in the previous cache (if there is any)
+        determined by the link parameter
+    (3) all flag fields of the tables whose data field are put into the cache:
+        - match flag (optional),
+        - null bitmaps for all tables,
+        - null row flags for all tables
+    (4) values of all data fields including
+        - full images of those fixed legth data fields that cannot have 
+          trailing spaces
+        - significant part of fixed length fields that can have trailing spaces
+          with the prepanded length 
+        - data of non-blob variable length fields with the prepanded data length  
+        - blob data from blob fields with the prepanded data length
+    (5) record offset values for the data fields that are referred to from 
+        other caches
+ 
+    The record is written at the current position stored in the field 'pos'.
+    At the end of the function 'pos' points at the position right after the 
+    written record data.
+    The function increments the number of records in the cache that is stored
+    in the 'records' field by 1. The function also modifies the values of
+    'curr_rec_pos' and 'last_rec_pos' to point to the written record.
+    The 'end_pos' cursor is modified accordingly.
+    The 'last_rec_blob_data_is_in_rec_buff' is set on if the blob data 
+    remains in the record buffers and not copied to the join buffer. It may
+    happen only to the blob data from the last record added into the cache.
+   
+    
+  RETURN
+    length of the written record data
+*/
+
+uint JOIN_CACHE::write_record_data(uchar * link, bool *is_full)
+{
+  uint len;
+  bool last_record;
+  CACHE_FIELD *copy;
+  CACHE_FIELD *copy_end;
+  uchar *cp= pos;
+  uchar *init_pos= cp;
+  uchar *rec_len_ptr= 0;
+ 
+  records++;  /* Increment the counter of records in the cache */
+
+  len= pack_length;
+
+  /* Make an adjustment for the size of the auxiliary buffer if there is any */
+  uint incr= aux_buffer_incr();
+  ulong rem= rem_space();
+  aux_buff_size+= len+incr < rem ? incr : rem;
+
+  /*
+    For each blob to be put into cache save its length and a pointer
+    to the value in the corresponding element of the blob_ptr array.
+    Blobs with null values are skipped.
+    Increment 'len' by the total length of all these blobs. 
+  */    
+  if (blobs)
+  {
+    CACHE_FIELD **copy_ptr= blob_ptr;
+    CACHE_FIELD **copy_ptr_end= copy_ptr+blobs;
+    for ( ; copy_ptr < copy_ptr_end; copy_ptr++)
+    {
+      Field_blob *blob_field= (Field_blob *) (*copy_ptr)->field;
+      if (!blob_field->is_null())
+      {
+        uint blob_len= blob_field->get_length();
+        (*copy_ptr)->blob_length= blob_len;
+        len+= blob_len;
+        blob_field->get_ptr(&(*copy_ptr)->str);
+      }
+    }
+  }
+
+  /*
+    Check whether we won't be able to add any new record into the cache after
+    this one because the cache will be full. Set last_record to TRUE if it's so.
+    The assume that the cache will be full after the record has been written
+    into it if either the remaining space of the cache is not big enough for the 
+    record's blob values or if there is a chance that not all non-blob fields
+    of the next record can be placed there.
+    This function is called only in the case when there is enough space left in
+    the cache to store at least non-blob parts of the current record.
+  */
+  last_record= (len+pack_length_with_blob_ptrs) > rem_space();
+  
+  /* 
+    Save the position for the length of the record in the cache if it's needed.
+    The length of the record will be inserted here when all fields of the record
+    are put into the cache.  
+  */
+  if (with_length)
+  {
+    rec_len_ptr= cp;   
+    cp+= size_of_rec_len;
+  }
+
+  /*
+    Put a reference to the fields of the record that are stored in the previous
+    cache if there is any. This reference is passed by the 'link' parameter.     
+  */
+  if (prev_cache)
+  {
+    cp+= prev_cache->get_size_of_rec_offset();
+    prev_cache->store_rec_ref(cp, link);
+  } 
+
+  curr_rec_pos= cp;
+  
+  /* If the there is a match flag set its value to 0 */
+  copy= field_descr;
+  if (with_match_flag)
+    *copy[0].str= 0;
+
+  /* First put into the cache the values of all flag fields */
+  copy_end= field_descr+flag_fields;
+  for ( ; copy < copy_end; copy++)
+  {
+    memcpy(cp, copy->str, copy->length);
+    cp+= copy->length;
+  } 
+  
+  /* Now put the values of the remaining fields as soon as they are not nulls */ 
+  copy_end= field_descr+fields;
+  for ( ; copy < copy_end; copy++)
+  {
+    Field *field= copy->field;
+    if (field && field->maybe_null() && field->is_null())
+    {
+      /* Do not copy a field if its value is null */
+      if (copy->referenced_field_no)
+        copy->offset= 0;
+      continue;              
+    }
+    /* Save the offset of the field to put it later at the end of the record */ 
+    if (copy->referenced_field_no)
+      copy->offset= cp-curr_rec_pos;
+
+    if (copy->type == CACHE_BLOB)
+    {
+      Field_blob *blob_field= (Field_blob *) copy->field;
+      if (last_record)
+      {
+        last_rec_blob_data_is_in_rec_buff= 1;
+        /* Put down the length of the blob and the pointer to the data */  
+	blob_field->get_image(cp, copy->length+sizeof(char*),
+                              blob_field->charset());
+	cp+= copy->length+sizeof(char*);
+      }
+      else
+      {
+        /* First put down the length of the blob and then copy the data */ 
+	blob_field->get_image(cp, copy->length, 
+			      blob_field->charset());
+	memcpy(cp+copy->length, copy->str, copy->blob_length);               
+	cp+= copy->length+copy->blob_length;
+      }
+    }
+    else
+    {
+      switch (copy->type) {
+      case CACHE_VARSTR1:
+        /* Copy the significant part of the short varstring field */ 
+        len= (uint) copy->str[0] + 1;
+        memcpy(cp, copy->str, len);
+        cp+= len;
+        break;
+      case CACHE_VARSTR2:
+        /* Copy the significant part of the long varstring field */
+        len= uint2korr(copy->str) + 2;
+        memcpy(cp, copy->str, len);
+        cp+= len;
+        break;
+      case CACHE_STRIPPED:
+      {
+        /* 
+          Put down the field value stripping all trailing spaces off.
+          After this insert the length of the written sequence of bytes.
+        */ 
+	uchar *str, *end;
+	for (str= copy->str, end= str+copy->length;
+	     end > str && end[-1] == ' ';
+	     end--) ;
+	len=(uint) (end-str);
+        int2store(cp, len);
+	memcpy(cp+2, str, len);
+	cp+= len+2;
+        break;
+      }
+      default:      
+        /* Copy the entire image of the field from the record buffer */
+	memcpy(cp, copy->str, copy->length);
+	cp+= copy->length;
+      }
+    }
+  }
+  
+  /* Add the offsets of the fields that are referenced from other caches */ 
+  if (referenced_fields)
+  {
+    uint cnt= 0;
+    for (copy= field_descr+flag_fields; copy < copy_end ; copy++)
+    {
+      if (copy->referenced_field_no)
+      {
+        store_fld_offset(cp+size_of_fld_ofs*(copy->referenced_field_no-1),
+                         copy->offset);
+        cnt++;
+      }
+    }
+    cp+= size_of_fld_ofs*cnt;
+  }
+
+  if (rec_len_ptr)
+    store_rec_length(rec_len_ptr, (ulong) (cp-rec_len_ptr-size_of_rec_len));
+  last_rec_pos= curr_rec_pos; 
+  end_pos= pos= cp;
+  *is_full= last_record;
+  return (uint) (cp-init_pos);
+}
+
+
+/* 
+  Reset the join buffer for reading/writing: default implementation
+
+  SYNOPSIS
+    reset()
+      for_writing  if it's TRUE the function reset the buffer for writing
+
+  DESCRIPTION
+    This default implementation of the virtual function reset() resets 
+    the join buffer for reading or writing.
+    If the buffer is reset for reading only the 'pos' value is reset
+    to point to the very beginning of the join buffer. If the buffer is
+    reset for writing additionally: 
+    - the counter of the records in the buffer is set to 0,
+    - the the value of 'last_rec_pos' gets pointing at the position just
+      before the buffer, 
+    - 'end_pos' is set to point to the beginning of the join buffer,
+    - the size of the auxiliary buffer is reset to 0,
+    - the flag 'last_rec_blob_data_is_in_rec_buff' is set to 0.
+    
+  RETURN
+    none
+*/
+
+void JOIN_CACHE::reset(bool for_writing)
+{
+  pos= buff;
+  curr_rec_link= 0;
+  if (for_writing)
+  {
+    records= 0;
+    last_rec_pos= buff;
+    aux_buff_size= 0;
+    end_pos= pos;
+    last_rec_blob_data_is_in_rec_buff= 0;
+  }
+}
+
+/* 
+  Add a record into the join buffer: the default implementation
+
+  SYNOPSIS
+    put_record()
+
+  DESCRIPTION
+    This default implementation of the virtual function put_record writes
+    the next matching record into the join buffer.
+    It also links the record having been written into the join buffer with
+    the matched record in the previous cache if there is any.
+    The implementation assumes that the function get_curr_link() 
+    will return exactly the pointer to this matched record.
+
+  RETURN
+    TRUE    if it has been decided that it should be the last record
+            in the join buffer,
+    FALSE   otherwise
+*/
+
+bool JOIN_CACHE::put_record()
+{
+  bool is_full;
+  uchar *link= 0;
+  if (prev_cache)
+    link= prev_cache->get_curr_rec_link();
+  write_record_data(link, &is_full);
+  return is_full;
+}
+  
+
+/* 
+  Read the next record from the join buffer: the default implementation
+
+  SYNOPSIS
+    get_record()
+
+  DESCRIPTION
+    This default implementation of the virtual function get_record
+    reads fields of the next record from the join buffer of this cache.
+    The function also reads all other fields associated with this record
+    from the the join buffers of the previous caches. The fields are read
+    into the corresponding record buffers.
+    It is supposed that 'pos' points to the position in the buffer 
+    right after the previous record when the function is called.
+    When the function returns the 'pos' values is updated to point
+    to the position after the read record.
+    The value of 'curr_rec_pos' is also updated by the function to
+    point to the beginning of the first field of the record in the
+    join buffer.    
+
+  RETURN
+    TRUE  - there are no more records to read from the join buffer
+    FALSE - otherwise
+*/
+
+bool JOIN_CACHE::get_record()
+{ 
+  bool res;
+  uchar *prev_rec_ptr= 0;
+  if (with_length)
+    pos+= size_of_rec_len;
+  if (prev_cache)
+  {
+    pos+= prev_cache->get_size_of_rec_offset();
+    prev_rec_ptr= prev_cache->get_rec_ref(pos);
+  }
+  curr_rec_pos= pos;
+  if (!(res= read_all_record_fields() == 0))
+  {
+    pos+= referenced_fields*size_of_fld_ofs;
+    if (prev_cache)
+      prev_cache->get_record_by_pos(prev_rec_ptr);
+  } 
+  return res; 
+}
+
+
+/* 
+  Read a positioned record from the join buffer: the default implementation
+
+  SYNOPSIS
+    get_record_by_pos()
+      rec_ptr  position of the first field of the record in the join buffer
+
+  DESCRIPTION
+    This default implementation of the virtual function get_record_pos
+    reads the fields of the record positioned at 'rec_ptr' from the join buffer.
+    The function also reads all other fields associated with this record 
+    from the the join buffers of the previous caches. The fields are read
+    into the corresponding record buffers.
+
+  RETURN
+    none
+*/
+
+void JOIN_CACHE::get_record_by_pos(uchar *rec_ptr)
+{
+  uchar *save_pos= pos;
+  pos= rec_ptr;
+  read_all_record_fields();
+  pos= save_pos;
+  if (prev_cache)
+  {
+    uchar *prev_rec_ptr= prev_cache->get_rec_ref(rec_ptr);
+    prev_cache->get_record_by_pos(prev_rec_ptr);
+  }
+}
+
+
+/* 
+  Test the match flag from the referenced record: the default implementation
+
+  SYNOPSIS
+    get_match_flag_by_pos()
+      rec_ptr  position of the first field of the record in the join buffer
+
+  DESCRIPTION
+    This default implementation of the virtual function get_match_flag_by_pos
+    test the match flag for the record pointed by the reference at the position
+    rec_ptr. If the match flag in placed one of the previous buffers the function
+    first reaches the linked record fields in this buffer.
+
+  RETURN
+    TRUE    if the match flag is set on
+    FALSE   otherwise
+*/
+
+bool JOIN_CACHE::get_match_flag_by_pos(uchar *rec_ptr)
+{
+  if (with_match_flag)
+    return test(*rec_ptr);
+  if (prev_cache)
+  {
+    uchar *prev_rec_ptr= prev_cache->get_rec_ref(rec_ptr);
+    return prev_cache->get_match_flag_by_pos(prev_rec_ptr);
+  } 
+  DBUG_ASSERT(1);
+  return FALSE;
+}
+
+
+/* 
+  Read all flag and data fields of a record from the join buffer
+
+  SYNOPSIS
+    read_all_record_fields()
+
+  DESCRIPTION
+    The function reads all flag and data fields of a record from the join
+    buffer into the corresponding record buffers.
+    The fields are read starting from the position 'pos' which is
+    supposed to point to the beginning og the first record field.
+    The function increments the value of 'pos' by the length of the
+    read data. 
+
+  RETURN
+    length of the data read from the join buffer
+*/
+
+uint JOIN_CACHE::read_all_record_fields()
+{
+  uchar *init_pos= pos;
+  
+  if (pos > last_rec_pos || !records)
+    return 0;
+
+  /* First match flag, read null bitmaps and null_row flag for each table */
+  read_flag_fields();
+ 
+  /* Now read the remaining table fields if needed */
+  CACHE_FIELD *copy= field_descr+flag_fields;
+  CACHE_FIELD *copy_end= field_descr+fields;
+  bool blob_in_rec_buff= blob_data_is_in_rec_buff(init_pos);
+  for ( ; copy < copy_end; copy++)
+    read_record_field(copy, blob_in_rec_buff);
+
+  return (uint) (pos-init_pos);
+}
+
+
+/* 
+  Read all flag fields of a record from the join buffer
+
+  SYNOPSIS
+    read_flag_fields()
+
+  DESCRIPTION
+    The function reads all flag fields of a record from the join
+    buffer into the corresponding record buffers.
+    The fields are read starting from the position 'pos'.
+    The function increments the value of 'pos' by the length of the
+    read data. 
+
+  RETURN
+    length of the data read from the join buffer
+*/
+
+uint JOIN_CACHE::read_flag_fields()
+{
+  uchar *init_pos= pos;
+  CACHE_FIELD *copy= field_descr;
+  CACHE_FIELD *copy_end= copy+flag_fields;
+  for ( ; copy < copy_end; copy++)
+  {
+    memcpy(copy->str, pos, copy->length);
+    pos+= copy->length;
+  }
+  return (pos-init_pos);
+}
+
+
+/* 
+  Read a data record field from the join buffer
+
+  SYNOPSIS
+    read_record_field()
+      copy             the descriptor of the data field to be read
+      blob_in_rec_buff indicates whether this is the field from the record
+                       whose blob data are in record buffers
+
+  DESCRIPTION
+    The function reads the data field specified by the parameter copy
+    from the join buffer into the corresponding record buffer. 
+    The field is read starting from the position 'pos'.
+    The data of blob values is not copied from the join buffer.
+    The function increments the value of 'pos' by the length of the
+    read data. 
+
+  RETURN
+    length of the data read from the join buffer
+*/
+
+uint JOIN_CACHE::read_record_field(CACHE_FIELD *copy, bool blob_in_rec_buff)
+{
+  uint len;
+  /* Do not copy the field if its value is null */ 
+  if (copy->field && copy->field->maybe_null() && copy->field->is_null())
+    return 0;           
+  if (copy->type == CACHE_BLOB)
+  {
+    Field_blob *blob_field= (Field_blob *) copy->field;
+    /* 
+      Copy the length and the pointer to data but not the blob data 
+      itself to the record buffer
+    */ 
+    if (blob_in_rec_buff)
+    {
+      blob_field->set_image(pos, copy->length+sizeof(char*),
+			    blob_field->charset());
+      len= copy->length+sizeof(char*);
+    }
+    else
+    {
+      blob_field->set_ptr(pos, pos+copy->length);
+      len= copy->length+blob_field->get_length();
+    }
+  }
+  else
+  {
+    switch (copy->type) {
+    case CACHE_VARSTR1:
+      /* Copy the significant part of the short varstring field */
+      len= (uint) pos[0] + 1;
+      memcpy(copy->str, pos, len);
+      break;
+    case CACHE_VARSTR2:
+      /* Copy the significant part of the long varstring field */
+      len= uint2korr(pos) + 2;
+      memcpy(copy->str, pos, len);
+      break;
+    case CACHE_STRIPPED:
+      /* Pad the value by spaces that has been stripped off */
+      len= uint2korr(pos);
+      memcpy(copy->str, pos+2, len);
+      memset(copy->str+len, ' ', copy->length-len);
+      len+= 2;
+      break;
+    default:
+      /* Copy the entire image of the field from the record buffer */
+      len= copy->length;
+      memcpy(copy->str, pos, len);
+    }
+  }
+  pos+= len;
+  return len;
+}
+
+
+/* 
+  Read a referenced field from the join buffer
+
+  SYNOPSIS
+    read_referenced_field()
+      copy         pointer to the descriptor of the referenced field
+      rec_ptr      pointer to the record that may contain this field
+      len  IN/OUT  total length of the record fields 
+
+  DESCRIPTION
+    The function checks whether copy points to a data field descriptor
+    for this cache object. If it does not then the function returns
+    FALSE. Otherwise the function reads the field of the record in
+    the join buffer pointed by 'rec_ptr' into the corresponding record
+    buffer and returns TRUE.
+    If the value of *len is 0 then the function sets it to the total
+    length of the record fields including possible trailing offset
+    values. Otherwise *len is supposed to provide this value that
+    has been obtained earlier.  
+
+  RETURN
+    TRUE   'copy' points to a data descriptor of this join cache
+    FALSE  otherwise
+*/
+
+bool JOIN_CACHE::read_referenced_field(CACHE_FIELD *copy,
+                                       uchar *rec_ptr, 
+                                       uint *len)
+{
+  uchar *ptr;
+  uint offset;
+  if (copy < field_descr || copy >= field_descr+fields)
+    return FALSE;
+  if (!*len)
+  {
+    /* Get the total length of the record fields */ 
+    uchar *len_ptr= rec_ptr;
+    if (prev_cache)
+      len_ptr-= prev_cache->get_size_of_rec_offset();
+    *len= get_rec_length(len_ptr-size_of_rec_len);
+  }
+  
+  ptr= rec_ptr-(prev_cache ? prev_cache->get_size_of_rec_offset() : 0);  
+  offset= get_fld_offset(ptr+ *len - 
+                         size_of_fld_ofs*
+                         (referenced_fields+1-copy->referenced_field_no));  
+  bool is_null= FALSE;
+  if (offset == 0 && flag_fields)
+    is_null= TRUE;
+  if (is_null)
+    copy->field->set_null();
+  else
+  {
+    uchar *save_pos= pos;
+    copy->field->set_notnull(); 
+    pos= rec_ptr+offset;
+    read_record_field(copy, blob_data_is_in_rec_buff(rec_ptr));
+    pos= save_pos;
+  }
+  return TRUE;
+}
+   
+
+/* 
+  Skip record from join buffer if its match flag is on: default implementation
+
+  SYNOPSIS
+    skip_record_if_match()
+
+  DESCRIPTION
+    This default implementation of the virtual function skip_record_if_match
+    skips the next record from the join buffer if its  match flag is set on.
+    If the record is skipped the value of 'pos' is set to points to the position
+    right after the record.
+
+  RETURN
+    TRUE  - the match flag is on and the record has been skipped
+    FALSE - the match flag is off 
+*/
+
+bool JOIN_CACHE::skip_record_if_match()
+{
+  DBUG_ASSERT(with_match_flag && with_length);
+  uint offset= size_of_rec_len;
+  if (prev_cache)
+    offset+= prev_cache->get_size_of_rec_offset();
+  /* Check whether the match flag is on */
+  if (test(*(pos+offset)))
+  {
+    pos+= size_of_rec_len + get_rec_length(pos);
+    return TRUE;
+  }
+  return FALSE;
+}      
+
+
+/* 
+  Restore the fields of the last record from the join buffer
+ 
+  SYNOPSIS
+    restore_last_record()
+
+  DESCRIPTION
+    This function restore the values of the fields of the last record put
+    into join buffer in record buffers. The values most probably have been
+    overwritten by the field values from other records when they were read
+    from the join buffer into the record buffer in order to check pushdown
+    predicates.
+
+  RETURN
+    none
+*/
+
+void JOIN_CACHE::restore_last_record()
+{
+  if (records)
+    get_record_by_pos(last_rec_pos);
+}
+
+
+/*
+  Join records from the join buffer with records from the next join table    
+
+  SYNOPSIS
+    join_records()
+      skip_last    do not find matches for the last record from the buffer
+
+  DESCRIPTION
+    The functions extends all records from the join buffer by the matched
+    records from join_tab. In the case of outer join operation it also
+    adds null complementing extensions for the records from the join buffer
+    that have no match. 
+    No extensions are generated for the last record from the buffer if
+    skip_last is true.  
+
+  NOTES
+    The function must make sure that if linked join buffers are used then
+    a join buffer cannot be refilled again until all extensions in the
+    buffers chained to this one are generated.
+    Currently an outer join operation with several inner tables always uses
+    at least two linked buffers with the match join flags placed in the
+    first buffer. Any record composed of rows of the inner tables that
+    matches a record in this buffer must refer to the position of the
+    corresponding match flag.
+
+  IMPLEMENTATION
+    When generating extensions for outer tables of an outer join operation
+    first we generate all extensions for those records from the join buffer
+    that have matches, after which null complementing extension for all
+    unmatched records from the join buffer are generated.  
+      
+  RETURN
+    return one of enum_nested_loop_state, except NESTED_LOOP_NO_MORE_ROWS.
+*/ 
+
+enum_nested_loop_state JOIN_CACHE::join_records(bool skip_last)
+{
+  JOIN_TAB *tab;
+  enum_nested_loop_state rc= NESTED_LOOP_OK;
+  bool outer_join_first_inner= join_tab->is_first_inner_for_outer_join();
+
+  if (outer_join_first_inner && !join_tab->first_unmatched)
+    join_tab->not_null_compl= TRUE;   
+
+  if (!join_tab->first_unmatched)
+  {
+    /* Find all records from join_tab that match records from join buffer */
+    rc= join_matching_records(skip_last);   
+    if (rc != NESTED_LOOP_OK && rc != NESTED_LOOP_NO_MORE_ROWS)
+      goto finish;
+    if (outer_join_first_inner)
+    {
+      if (next_cache)
+      {
+        /* 
+          Ensure that all matches for outer records from join buffer are to be
+          found. Now we ensure that all full records are found for records from
+          join buffer. Generally this is an overkill.
+          TODO: Ensure that only matches of the inner table records have to be
+          found for the records from join buffer.
+	*/ 
+        rc= next_cache->join_records(skip_last);
+        if (rc != NESTED_LOOP_OK && rc != NESTED_LOOP_NO_MORE_ROWS)
+          goto finish;
+      }
+      join_tab->not_null_compl= FALSE;
+      /* Prepare for generation of null complementing extensions */
+      for (tab= join_tab->first_inner; tab <= join_tab->last_inner; tab++)
+        tab->first_unmatched= join_tab->first_inner;
+    }
+  }
+  if (join_tab->first_unmatched)
+  {
+    if (is_key_access())
+      restore_last_record();
+
+    /* 
+      Generate all null complementing extensions for the records from
+      join buffer that don't have any matching rows from the inner tables.
+    */
+    reset(FALSE);
+    rc= join_null_complements(skip_last);   
+    if (rc != NESTED_LOOP_OK && rc != NESTED_LOOP_NO_MORE_ROWS)
+      goto finish;
+  }
+  if(next_cache)
+  {
+    /* 
+      When using linked caches we must ensure the records in the next caches
+      that refer to the records in the join buffer are fully extended.
+      Otherwise we could have references to the records that have been
+      already erased from the join buffer and replaced for new records. 
+    */ 
+    rc= next_cache->join_records(skip_last);
+    if (rc != NESTED_LOOP_OK && rc != NESTED_LOOP_NO_MORE_ROWS)
+      goto finish;
+  }
+  if (outer_join_first_inner)
+  {
+    /* 
+      All null complemented rows have been already generated for all
+      outer records from join buffer. Restore the state of the
+      first_unmatched values to 0 to avoid another null complementing.
+    */
+    for (tab= join_tab->first_inner; tab <= join_tab->last_inner; tab++)
+      tab->first_unmatched= 0;
+  } 
+ 
+  if (skip_last)
+  {
+    DBUG_ASSERT(!is_key_access());
+    /*
+       Restore the last record from the join buffer to generate
+       all extentions for it.
+    */
+    get_record();		               
+  }
+
+finish:
+  restore_last_record();
+  reset(TRUE);
+  return rc;
+}
+
+
+/*
+  Using BNL find matches from the next table for records from the join buffer   
+
+  SYNOPSIS
+    join_matching_records()
+      skip_last    do not look for matches for the last partial join record 
+
+  DESCRIPTION
+    The function retrieves all rows of the join_tab table and check whether
+    they match partial join records from the join buffer. If a match is found
+    the function will call the sub_select function trying to look for matches
+    for the remaining join operations.
+    This function currently is called only from the function join_records.    
+    If the value of skip_last is true the function writes the partial join
+    record from the record buffer into the join buffer to save its value for
+    the future processing in the caller function.
+
+  NOTES
+    The function produces all matching extensions for the records in the 
+    join buffer following the path of the Blocked Nested Loops algorithm. 
+    When an outer join operation is performed all unmatched records from
+    the join buffer must be extended by null values. The function 
+    'join_null_complements' serves this purpose.  
+      
+  RETURN
+    return one of enum_nested_loop_state.
+*/ 
+
+enum_nested_loop_state JOIN_CACHE_BNL::join_matching_records(bool skip_last)
+{
+  uint cnt;
+  int error;
+  JOIN_TAB *tab;
+  READ_RECORD *info;
+  enum_nested_loop_state rc= NESTED_LOOP_OK;
+  bool check_only_first_match= join_tab->check_only_first_match();
+  SQL_SELECT *select= join_tab->cache_select;
+
+  join_tab->table->null_row= 0;
+
+  /* Return at once if there are no records in the join buffer */
+  if (!records)     
+    return NESTED_LOOP_OK;   
+ 
+  /* 
+    When joining we read records from the join buffer back into record buffers.
+    If matches for the last partial join record are found through a call to
+    the sub_select function then this partial join record must be saved in the
+    join buffer in order to be restored just before the sub_select call.
+  */             
+  if (skip_last)     
+    put_record();     
+ 
+  if (join_tab->use_quick == 2 && join_tab->select->quick)
+  { 
+    /* A dynamic range access was used last. Clean up after it */
+    delete join_tab->select->quick;
+    join_tab->select->quick= 0;
+  }
+
+  for (tab= join->join_tab; tab != join_tab ; tab++)
+  {
+    tab->status= tab->table->status;
+    tab->table->status= 0;
+  }
+
+  /* Start retrieving all records of the joined table */
+  if ((error= join_init_read_record(join_tab))) 
+  {
+    rc= error < 0 ? NESTED_LOOP_NO_MORE_ROWS: NESTED_LOOP_ERROR;
+    goto finish;
+  }
+
+  info= &join_tab->read_record;
+  do
+  {
+/* !!! NB igor: Enable the code in the comment after backporting the SJ code
+    if (join_tab->keep_current_rowid)
+      join_tab->table->file->position(join_tab->table->record[0]);
+*/
+
+    if (join->thd->killed)
+    {
+      /* The user has aborted the execution of the query */
+      join->thd->send_kill_message();
+      rc= NESTED_LOOP_KILLED;
+      goto finish; 
+    }
+    
+    /* 
+      Do not look for matches if the last read record of the joined table
+      does not meet the conditions that have been pushed to this table
+    */
+    if (rc == NESTED_LOOP_OK && (!select || !select->skip_record()))
+    {
+      /* Prepare to read records from the join buffer */
+      reset(FALSE);
+
+      /* Read each record from the join buffer and look for matches */
+      for (cnt= records - test(skip_last) ; cnt; cnt--)
+      { 
+        /* 
+          If only the first match is needed and it has been already found for
+          the next record read from the join buffer then the record is skipped.
+	*/
+        if (!check_only_first_match || !skip_record_if_match())
+        {
+	  get_record();
+          rc= generate_full_extensions(get_curr_rec());
+          if (rc != NESTED_LOOP_OK && rc != NESTED_LOOP_NO_MORE_ROWS)
+	    goto finish;   
+        }
+      }
+    }
+  } while (!(error= info->read_record(info)));
+
+  if (error > 0)				// Fatal error
+    rc= NESTED_LOOP_ERROR; 
+finish:                  
+  for (tab= join->join_tab; tab != join_tab ; tab++)
+    tab->table->status= tab->status;
+  return rc;
+}
+
+     
+/*
+  Set match flag for a record in join buffer if it has not been set yet    
+
+  SYNOPSIS
+    set_match_flag_if_none()
+      first_inner     the join table to which this flag is attached to
+      rec_ptr         pointer to the record in the join buffer 
+
+  DESCRIPTION
+    If the records of the table are accumulated in a join buffer the function
+    sets the match flag for the record in the buffer that is referred to by
+    the record from this cache positioned at 'rec_ptr'. 
+    The function also sets the match flag 'found' of the table first inner
+    if it has not been set before. 
+
+  NOTES
+    The function assumes that the match flag for any record in any cache
+    is placed in the first byte occupied by the record fields. 
+
+  RETURN
+    TRUE   the match flag is set by this call for the first time
+    FALSE  the match flag has been set before this call
+*/ 
+
+bool JOIN_CACHE::set_match_flag_if_none(JOIN_TAB *first_inner,
+                                        uchar *rec_ptr)
+{
+  if (!first_inner->cache)
+  {
+    /* 
+      Records of the first inner table to which the flag is attached to
+      are not accumulated in a join buffer.
+    */
+    if (first_inner->found)
+      return FALSE;
+    else
+    {
+      first_inner->found= 1;
+      return TRUE;
+    }
+  }
+  JOIN_CACHE *cache= this;
+  while (cache->join_tab != first_inner)
+  {
+    cache= cache->prev_cache;
+    DBUG_ASSERT(cache);
+    rec_ptr= cache->get_rec_ref(rec_ptr);
+  } 
+  if (rec_ptr[0] == 0)
+  {
+    rec_ptr[0]= 1;
+    first_inner->found= 1;
+    return TRUE;  
+  }
+  return FALSE;
+}
+
+
+/*
+  Generate all full extensions for a partial join record in the buffer    
+
+  SYNOPSIS
+    generate_full_extensions()
+      rec_ptr     pointer to the record from join buffer to generate extensions 
+
+  DESCRIPTION
+    The function first checks whether the current record of 'join_tab' matches
+    the partial join record from join buffer located at 'rec_ptr'. If it is the
+    case the function calls the join_tab->next_select method to generate
+    all full extension for this partial join match.
+      
+  RETURN
+    return one of enum_nested_loop_state.
+*/ 
+
+enum_nested_loop_state JOIN_CACHE::generate_full_extensions(uchar *rec_ptr)
+{
+  enum_nested_loop_state rc= NESTED_LOOP_OK;
+  
+  /*
+    Check whether the extended partial join record meets
+    the pushdown conditions. 
+  */
+  if (check_match(rec_ptr))
+  {    
+    int res= 0;
+/* !!! NB igor: Enable the code in the comment after backporting the SJ code
+    if (!join_tab->check_weed_out_table || 
+        !(res= do_sj_dups_weedout(join->thd, join_tab->check_weed_out_table)))
+*/
+    {
+      set_curr_rec_link(rec_ptr);
+      rc= (join_tab->next_select)(join, join_tab+1, 0);
+      if (rc != NESTED_LOOP_OK && rc != NESTED_LOOP_NO_MORE_ROWS)
+      {
+        reset(TRUE);
+        return rc;
+      }
+    }
+    if (res == -1)
+    {
+      rc= NESTED_LOOP_ERROR;
+      return rc;
+    }
+  }
+  return rc;
+}
+
+
+/*
+  Check matching to a partial join record from the join buffer    
+
+  SYNOPSIS
+    check_match()
+      rec_ptr     pointer to the record from join buffer to check matching to 
+
+  DESCRIPTION
+    The function checks whether the current record of 'join_tab' matches
+    the partial join record from join buffer located at 'rec_ptr'. If this is
+    the case and 'join_tab' is the last inner table of a semi-join or an outer
+    join the function turns on the match flag for the 'rec_ptr' record unless
+    it has been already set.
+
+  NOTES
+    Setting the match flag on can trigger re-evaluation of pushdown conditions
+    for the record when join_tab is the last inner table of an outer join.
+      
+  RETURN
+    TRUE   there is a match
+    FALSE  there is no match
+*/ 
+
+inline bool JOIN_CACHE::check_match(uchar *rec_ptr)
+{
+  /* Check whether pushdown conditions are satisfied */
+  if (join_tab->select && join_tab->select->skip_record())
+    return FALSE;
+
+  if (!join_tab->is_last_inner_table())
+    return TRUE;
+
+  /* 
+     This is the last inner table of an outer join,
+     and maybe of other embedding outer joins, or
+     this is the last inner table of a semi-join.
+  */
+  JOIN_TAB *first_inner= join_tab->get_first_inner_table();
+  do
+  {
+    set_match_flag_if_none(first_inner, rec_ptr);
+    if (first_inner->check_only_first_match() &&
+        !join_tab->first_inner)
+      return TRUE;
+    /* 
+      This is the first match for the outer table row.
+      The function set_match_flag_if_none has turned the flag
+      first_inner->found on. The pushdown predicates for
+      inner tables must be re-evaluated with this flag on.
+      Note that, if first_inner is the first inner table 
+      of a semi-join, but is not an inner table of an outer join
+      such that 'not exists' optimization can  be applied to it, 
+      the re-evaluation of the pushdown predicates is not needed.
+    */      
+    for (JOIN_TAB *tab= first_inner; tab <= join_tab; tab++)
+    {
+      if (tab->select && tab->select->skip_record())
+        return FALSE;
+    }
+  }
+  while ((first_inner= first_inner->first_upper) &&
+         first_inner->last_inner == join_tab);
+  
+  return TRUE;
+} 
+
+
+/*
+  Add null complements for unmatched outer records from join buffer    
+
+  SYNOPSIS
+    join_null_complements()
+      skip_last    do not add null complements for the last record 
+
+  DESCRIPTION
+    This function is called only for inner tables of outer joins.
+    The function retrieves all rows from the join buffer and adds null
+    complements for those of them that do not have matches for outer
+    table records.
+    If the 'join_tab' is the last inner table of the embedding outer 
+    join and the null complemented record satisfies the outer join
+    condition then the the corresponding match flag is turned on
+    unless it has been set earlier. This setting may trigger
+    re-evaluation of pushdown conditions for the record. 
+
+  NOTES
+    The same implementation of the virtual method join_null_complements
+    is used for JOIN_CACHE_BNL and JOIN_CACHE_BKA.
+      
+  RETURN
+    return one of enum_nested_loop_state.
+*/ 
+
+enum_nested_loop_state JOIN_CACHE::join_null_complements(bool skip_last)
+{
+  uint cnt; 
+  enum_nested_loop_state rc= NESTED_LOOP_OK;
+  bool is_first_inner= join_tab == join_tab->first_unmatched;
+  bool is_last_inner= join_tab == join_tab->first_unmatched->last_inner;
+ 
+  /* Return at once if there are no records in the join buffer */
+  if (!records)
+    return NESTED_LOOP_OK;
+  
+  cnt= records - (is_key_access() ? 0 : test(skip_last));
+
+  /* This function may be called only for inner tables of outer joins */ 
+  DBUG_ASSERT(join_tab->first_inner);
+
+  for ( ; cnt; cnt--)
+  {
+    if (join->thd->killed)
+    {
+      /* The user has aborted the execution of the query */
+      join->thd->send_kill_message();
+      rc= NESTED_LOOP_KILLED;
+      goto finish;
+    }
+    /* Just skip the whole record if a match for it has been already found */
+    if (!is_first_inner || !skip_record_if_match())
+    {
+      get_record();
+      /* The outer row is complemented by nulls for each inner table */
+      restore_record(join_tab->table, s->default_values);
+      mark_as_null_row(join_tab->table);  
+      /* Check all pushdown conditions attached to the inner table */
+      join_tab->first_unmatched->found= 1;
+      if (join_tab->select && join_tab->select->skip_record())
+        continue;
+      if (is_last_inner)
+      { 
+        JOIN_TAB *first_upper= join_tab->first_unmatched->first_upper;
+        while (first_upper && first_upper->last_inner == join_tab)
+        {
+          set_match_flag_if_none(first_upper, get_curr_rec());
+          for (JOIN_TAB* tab= first_upper; tab <= join_tab; tab++)
+          {
+            if (tab->select && tab->select->skip_record())
+              goto next;
+          }
+          first_upper= first_upper->first_upper;
+        }
+      }
+      /* Find all matches for the remaining join tables */
+      rc= (*join_tab->next_select)(join, join_tab+1, 0);
+      if (rc != NESTED_LOOP_OK && rc != NESTED_LOOP_NO_MORE_ROWS)
+      {
+        reset(TRUE);
+        goto finish;
+      }
+    }
+  next:
+    ;
+  }
+
+finish:
+  return rc;
+}
+
+
+/*
+  Initialize retrieval of range sequence for BKA algorithm
+    
+  SYNOPSIS
+    bka_range_seq_init()
+     init_params   pointer to the BKA join cache object
+     n_ranges      the number of ranges obtained 
+     flags         combination of HA_MRR_SINGLE_POINT, HA_MRR_FIXED_KEY
+
+  DESCRIPTION
+    The function interprets init_param as a pointer to a JOIN_CACHE_BKA
+    object. The function prepares for an iteration over the join keys
+    built for all records from the cache join buffer.
+
+  NOTE
+    This function are used only as a callback function.    
+
+  RETURN
+    init_param value that is to be used as a parameter of bka_range_seq_next()
+*/    
+
+static 
+range_seq_t bka_range_seq_init(void *init_param, uint n_ranges, uint flags)
+{
+  DBUG_ENTER("bka_range_seq_init");
+  JOIN_CACHE_BKA *cache= (JOIN_CACHE_BKA *) init_param;
+  cache->reset(0);
+  DBUG_RETURN((range_seq_t) init_param);
+}
+
+
+/*
+  Get the key over the next record from the join buffer used by BKA  
+    
+  SYNOPSIS
+    bka_range_seq_next()
+      seq    the value returned by  bka_range_seq_init
+      range  OUT reference to the next range
+  
+  DESCRIPTION
+    The function interprets seq as a pointer to a JOIN_CACHE_BKA
+    object. The function returns a pointer to the range descriptor
+    for the key built over the next record from the join buffer.
+
+  NOTE
+    This function are used only as a callback function.
+   
+  RETURN
+    0   ok, the range structure filled with info about the next key
+    1   no more ranges
+*/    
+
+static 
+uint bka_range_seq_next(range_seq_t rseq, KEY_MULTI_RANGE *range)
+{
+  DBUG_ENTER("bka_range_seq_next");
+  JOIN_CACHE_BKA *cache= (JOIN_CACHE_BKA *) rseq;
+  TABLE_REF *ref= &cache->join_tab->ref;
+  key_range *start_key= &range->start_key;
+  if ((start_key->length= cache->get_next_key((uchar **) &start_key->key)))
+  {
+    start_key->keypart_map= (1 << ref->key_parts) - 1;
+    start_key->flag= HA_READ_KEY_EXACT;
+    range->end_key= *start_key;
+    range->end_key.flag= HA_READ_AFTER_KEY;
+    range->ptr= (char *) cache->get_curr_rec();
+    range->range_flag= EQ_RANGE;
+    DBUG_RETURN(0);
+  } 
+  DBUG_RETURN(1);
+}
+
+
+/*
+  Check whether range_info orders to skip the next record from BKA buffer
+
+  SYNOPSIS
+    bka_range_seq_skip_record()
+      seq              value returned by bka_range_seq_init()
+      range_info       information about the next range
+      rowid [NOT USED] rowid of the record to be checked 
+
+    
+  DESCRIPTION
+    The function interprets seq as a pointer to a JOIN_CACHE_BKA object.
+    The function interprets seq as a pointer to the JOIN_CACHE_BKA_UNIQUE
+    object. The function returns TRUE if the record with this range_info
+    is to be filtered out from the stream of records returned by
+    multi_range_read_next(). 
+
+  NOTE
+    This function are used only as a callback function.
+
+  RETURN
+    1    record with this range_info is to be filtered out from the stream
+         of records returned by multi_range_read_next()
+    0    the record is to be left in the stream
+*/ 
+
+static 
+bool bka_range_seq_skip_record(range_seq_t rseq, char *range_info, uchar *rowid)
+{
+  DBUG_ENTER("bka_range_seq_skip_record");
+  JOIN_CACHE_BKA *cache= (JOIN_CACHE_BKA *) rseq;
+  bool res= cache->get_match_flag_by_pos((uchar *) range_info);
+  DBUG_RETURN(res);
+}
+
+/*
+  Using BKA find matches from the next table for records from the join buffer   
+
+  SYNOPSIS
+    join_matching_records()
+      skip_last    do not look for matches for the last partial join record 
+
+  DESCRIPTION
+    This function can be used only when the table join_tab can be accessed
+    by keys built over the fields of previous join tables.
+    The function retrieves all partial join records from the join buffer and
+    for each of them builds the key value to access join_tab, performs index
+    look-up with this key and selects matching records yielded by this look-up
+    If a match is found the function will call the sub_select function trying
+    to look for matches for the remaining join operations.
+    This function currently is called only from the function join_records.    
+    It's assumed that this function is always called with the skip_last 
+    parameter equal to false.
+
+  NOTES
+    The function produces all matching extensions for the records in the 
+    join buffer following the path of the Batched Key Access algorithm. 
+    When an outer join operation is performed all unmatched records from
+    the join buffer must be extended by null values. The function 
+    join_null_complements serves this purpose.
+    The Batched Key Access algorithm assumes that key accesses are batched.
+    In other words it assumes that, first, either keys themselves or the
+    corresponding rowids (primary keys) are accumulated in a buffer, then
+    data rows from  join_tab are fetched for all of them. When a row is
+    fetched it is always returned with a reference to the key by which it
+    has been accessed.
+    When key values are batched we can save on the number of the server 
+    requests for index lookups. For the remote engines, like NDB cluster, it
+    essentially reduces the number of round trips between the server and
+    the engine when performing a join operation. 
+    When the rowids for the keys are batched we can optimize the order
+    in what we fetch the data for this rowids. The performance benefits of
+    this optimization can be significant for such engines as MyISAM, InnoDB.
+    What is exactly batched are hidden behind implementations of
+    MRR handler interface that is supposed to be appropriately chosen
+    for each engine. If for a engine no specific implementation of the MRR
+    interface is supllied then the default implementation is used. This
+    implementation actually follows the path of Nested Loops Join algorithm.
+    In this case BKA join surely will demonstrate a worse performance than
+    NL join. 
+            
+  RETURN
+    return one of enum_nested_loop_state
+*/
+
+enum_nested_loop_state JOIN_CACHE_BKA::join_matching_records(bool skip_last)
+{
+  int error;
+  handler *file= join_tab->table->file;
+  enum_nested_loop_state rc= NESTED_LOOP_OK;
+  uchar *rec_ptr= 0;
+  bool check_only_first_match= join_tab->check_only_first_match();
+
+  /* Set functions to iterate over keys in the join buffer */
+
+  RANGE_SEQ_IF seq_funcs= { bka_range_seq_init, 
+                            bka_range_seq_next,
+                            check_only_first_match ?
+                              bka_range_seq_skip_record : 0,
+                            join_tab->cache_idx_cond ?
+                              bka_skip_index_tuple : 0 };
+
+  /* The value of skip_last must be always FALSE when this function is called */
+  DBUG_ASSERT(!skip_last);
+
+  /* Return at once if there are no records in the join buffer */
+  if (!records)
+    return NESTED_LOOP_OK;  
+                   
+  rc= init_join_matching_records(&seq_funcs, records);
+  if (rc != NESTED_LOOP_OK)
+    goto finish;
+
+  while (!(error= file->multi_range_read_next((char **) &rec_ptr)))
+  {
+    if (join->thd->killed)
+    {
+      /* The user has aborted the execution of the query */
+      join->thd->send_kill_message();
+      rc= NESTED_LOOP_KILLED; 
+      goto finish;
+    }
+/* !!!NB igor: Enable the statement in the comment after backporting the SJ code
+    if (join_tab->keep_current_rowid)
+      join_tab->table->file->position(join_tab->table->record[0]);
+*/
+    /* 
+      If only the first match is needed and it has been already found 
+      for the associated partial join record then the returned candidate
+      is discarded.
+    */
+    if (rc == NESTED_LOOP_OK &&
+        (!check_only_first_match || !get_match_flag_by_pos(rec_ptr)))
+    {
+      get_record_by_pos(rec_ptr);
+      rc= generate_full_extensions(rec_ptr);
+      if (rc != NESTED_LOOP_OK && rc != NESTED_LOOP_NO_MORE_ROWS)
+	goto finish;   
+    }
+  }
+
+  if (error > 0 && error != HA_ERR_END_OF_FILE)	   
+    return NESTED_LOOP_ERROR; 
+finish:                  
+  return end_join_matching_records(rc);
+}
+
+
+
+/* 
+  Prepare to search for records that match records from the join buffer
+
+  SYNOPSIS
+    init_join_matching_records()
+      seq_funcs    structure of range sequence interface
+      ranges       number of keys/ranges in the sequence
+
+  DESCRIPTION
+    This function calls the multi_range_read_init function to set up
+    the BKA process of generating the keys from the records in the join
+    buffer and looking for matching records from the table to be joined.
+    The function passes as a parameter a structure of functions that
+    implement the range sequence interface. This interface is used to
+    enumerate all generated keys and optionally to filter the matching
+    records returned by the multi_range_read_next calls from the
+    intended invocation of the join_matching_records method. The
+    multi_range_read_init function also receives the parameters for
+    MRR buffer to be used and flags specifying the mode in which
+    this buffer will be functioning.
+    The number of keys in the sequence expected by multi_range_read_init
+    is passed through the parameter ranges.  
+    
+  RETURN
+    return one of enum_nested_loop_state
+*/
+
+enum_nested_loop_state 
+JOIN_CACHE_BKA::init_join_matching_records(RANGE_SEQ_IF *seq_funcs, uint ranges)
+{
+  int error;
+  handler *file= join_tab->table->file;
+  enum_nested_loop_state rc= NESTED_LOOP_OK;
+
+  join_tab->table->null_row= 0;
+
+
+  /* Dynamic range access is never used with BKA */
+  DBUG_ASSERT(join_tab->use_quick != 2);
+
+  for (JOIN_TAB *tab =join->join_tab; tab != join_tab ; tab++)
+  {
+    tab->status= tab->table->status;
+    tab->table->status= 0;
+  }
+
+  init_mrr_buff();
+
+  /* 
+    Prepare to iterate over keys from the join buffer and to get
+    matching candidates obtained with MMR handler functions.
+  */ 
+  if (!file->inited)
+    file->ha_index_init(join_tab->ref.key, 1);
+  if ((error= file->multi_range_read_init(seq_funcs, (void*) this, ranges,
+					  mrr_mode, &mrr_buff)))
+    rc= error < 0 ? NESTED_LOOP_NO_MORE_ROWS: NESTED_LOOP_ERROR;
+  
+  return rc;
+}
+
+
+/* 
+  Finish searching for records that match records from the join buffer
+
+  SYNOPSIS
+    end_join_matching_records()
+      rc      return code passed by the join_matching_records function
+
+  DESCRIPTION
+    This function perform final actions on searching for all matches for
+    the records from the join buffer and building all full join extensions
+    of the records with these matches. 
+    
+  RETURN
+    return code rc passed to the function as a parameter
+*/
+
+enum_nested_loop_state 
+JOIN_CACHE_BKA::end_join_matching_records(enum_nested_loop_state rc)
+{
+  for (JOIN_TAB *tab=join->join_tab; tab != join_tab ; tab++)
+    tab->table->status= tab->status;
+  return rc;  
+}
+
+
+/* 
+  Get the key built over the next record from BKA join buffer
+
+  SYNOPSIS
+    get_next_key()
+      key    pointer to the buffer where the key value is to be placed
+
+  DESCRIPTION
+    The function reads key fields from the current record in the join buffer.
+    and builds the key value out of these fields that will be used to access
+    the 'join_tab' table. Some of key fields may belong to previous caches.
+    They are accessed via record references to the record parts stored in the
+    previous join buffers. The other key fields always are placed right after
+    the flag fields of the record.
+    If the key is embedded, which means that its value can be read directly
+    from the join buffer, then *key is set to the beginning of the key in
+    this buffer. Otherwise the key is built in the join_tab->ref->key_buff.
+    The function returns the length of the key if it succeeds ro read it.
+    If is assumed that the functions starts reading at the position of
+    the record length which is provided for each records in a BKA cache.
+    After the key is built the 'pos' value points to the first position after
+    the current record. 
+    The function returns 0 if the initial position is after the beginning
+    of the record fields for last record from the join buffer. 
+
+  RETURN
+    length of the key value - if the starting value of 'pos' points to
+    the position before the fields for the last record,
+    0 - otherwise.     
+*/
+
+uint JOIN_CACHE_BKA::get_next_key(uchar ** key)
+{
+  uint len;
+  uint32 rec_len;
+  uchar *init_pos;
+  JOIN_CACHE *cache;
+  
+  if (pos > last_rec_pos || !records)
+    return 0;
+
+  /* Any record in a BKA cache is prepended with its length */
+  DBUG_ASSERT(with_length);
+   
+  /* Read the length of the record */
+  rec_len= get_rec_length(pos);
+  pos+= size_of_rec_len; 
+  init_pos= pos;
+
+  /* Read a reference to the previous cache if any */
+  if (prev_cache)
+    pos+= prev_cache->get_size_of_rec_offset();
+
+  curr_rec_pos= pos;
+
+  /* Read all flag fields of the record */
+  read_flag_fields();
+ 
+  if (use_emb_key)
+  {
+    /* An embedded key is taken directly from the join buffer */
+    *key= pos;
+    len= emb_key_length;
+  }
+  else
+  {
+    /* Read key arguments from previous caches if there are any such fields */
+    if (external_key_arg_fields)
+    {
+      uchar *rec_ptr= curr_rec_pos;
+      uint key_arg_count= external_key_arg_fields;
+      CACHE_FIELD **copy_ptr= blob_ptr-key_arg_count;
+      for (cache= prev_cache; key_arg_count; cache= cache->prev_cache)
+      { 
+        uint len= 0;
+        DBUG_ASSERT(cache);
+        rec_ptr= cache->get_rec_ref(rec_ptr);
+        while (!cache->referenced_fields)
+        {
+          cache= cache->prev_cache;
+          DBUG_ASSERT(cache);
+          rec_ptr= cache->get_rec_ref(rec_ptr);
+        }
+        while (key_arg_count && 
+               cache->read_referenced_field(*copy_ptr, rec_ptr, &len))
+        {
+          copy_ptr++;
+          --key_arg_count;
+        }
+      }
+    }
+    
+    /* 
+      Read the other key arguments from the current record. The fields for
+      these arguments are always first in the sequence of the record's fields.
+    */     
+    CACHE_FIELD *copy= field_descr+flag_fields;
+    CACHE_FIELD *copy_end= copy+local_key_arg_fields;
+    bool blob_in_rec_buff= blob_data_is_in_rec_buff(curr_rec_pos);
+    for ( ; copy < copy_end; copy++)
+      read_record_field(copy, blob_in_rec_buff);
+    
+    /* Build the key over the fields read into the record buffers */ 
+    TABLE_REF *ref= &join_tab->ref;
+    cp_buffer_from_ref(join->thd, join_tab->table, ref);
+    *key= ref->key_buff;
+    len= ref->key_length;
+  }
+
+  pos= init_pos+rec_len;
+
+  return len;
+} 
+
+
+/* 
+  Initialize a BKA_UNIQUE cache       
+
+  SYNOPSIS
+    init()
+
+  DESCRIPTION
+    The function initializes the cache structure. It supposed to be called
+    right after a constructor for the JOIN_CACHE_BKA_UNIQUE.
+    The function allocates memory for the join buffer and for descriptors of
+    the record fields stored in the buffer.
+    The function also estimates the number of hash table entries in the hash
+    table to be used and initializes this hash table.
+
+  NOTES
+    The code of this function should have been included into the constructor
+    code itself. However the new operator for the class JOIN_CACHE_BKA_UNIQUE
+    would never fail while memory allocation for the join buffer is not 
+    absolutely unlikely to fail. That's why this memory allocation has to be
+    placed in a separate function that is called in a couple with a cache 
+    constructor.
+    It is quite natural to put almost all other constructor actions into
+    this function.     
+  
+  RETURN
+    0   initialization with buffer allocations has been succeeded
+    1   otherwise
+*/
+
+int JOIN_CACHE_BKA_UNIQUE::init()
+{
+  int rc= 0;
+  TABLE_REF *ref= &join_tab->ref;
+  
+  DBUG_ENTER("JOIN_CACHE_BKA_UNIQUE::init");
+
+  hash_table= 0;
+  key_entries= 0;
+
+  if ((rc= JOIN_CACHE_BKA::init()))
+    DBUG_RETURN (rc);
+
+  key_length= ref->key_length;
+
+  /* Take into account a reference to the next record in the key chain */
+  pack_length+= get_size_of_rec_offset(); 
+ 
+  /* Calculate the minimal possible value of size_of_key_ofs greater than 1 */
+  uint max_size_of_key_ofs= max(2, get_size_of_rec_offset());  
+  for (size_of_key_ofs= 2;
+       size_of_key_ofs <= max_size_of_key_ofs;
+       size_of_key_ofs+= 2)
+  {    
+    key_entry_length= get_size_of_rec_offset() + // key chain header
+                      size_of_key_ofs +          // reference to the next key 
+                      (use_emb_key ?  get_size_of_rec_offset() : key_length);
+
+    uint n= buff_size / (pack_length+key_entry_length+size_of_key_ofs);
+
+    /*
+      TODO: Make a better estimate for this upper bound of
+            the number of records in in the join buffer.
+    */
+    uint max_n= buff_size / (pack_length-length+
+                             key_entry_length+size_of_key_ofs);
+
+    hash_entries= (uint) (n / 0.7);
+    
+    if (offset_size(max_n*key_entry_length) <=
+        size_of_key_ofs)
+      break;
+  }
+   
+  /* Initialize the hash table */ 
+  hash_table= buff + (buff_size-hash_entries*size_of_key_ofs);
+  cleanup_hash_table();
+  curr_key_entry= hash_table;
+
+  pack_length+= key_entry_length;
+  pack_length_with_blob_ptrs+= get_size_of_rec_offset() + key_entry_length;
+
+  rec_fields_offset= get_size_of_rec_offset()+get_size_of_rec_length()+
+                     (prev_cache ? prev_cache->get_size_of_rec_offset() : 0);
+
+  data_fields_offset= 0;
+  if (use_emb_key)
+  {
+    CACHE_FIELD *copy= field_descr;
+    CACHE_FIELD *copy_end= copy+flag_fields;
+    for ( ; copy < copy_end; copy++)
+      data_fields_offset+= copy->length;
+  } 
+
+  DBUG_RETURN(rc);
+}
+
+
+/* 
+  Reset the JOIN_CACHE_BKA_UNIQUE  buffer for reading/writing
+
+  SYNOPSIS
+    reset()
+      for_writing  if it's TRUE the function reset the buffer for writing
+
+  DESCRIPTION
+    This implementation of the virtual function reset() resets the join buffer
+    of the JOIN_CACHE_BKA_UNIQUE class for reading or writing.
+    Additionally to what the default implementation does this function
+    cleans up the hash table allocated within the buffer.  
+    
+  RETURN
+    none
+*/
+ 
+void JOIN_CACHE_BKA_UNIQUE::reset(bool for_writing)
+{
+  this->JOIN_CACHE::reset(for_writing);
+  if (for_writing && hash_table)
+    cleanup_hash_table();
+  curr_key_entry= hash_table;
+}
+
+/* 
+  Add a record into the JOIN_CACHE_BKA_UNIQUE buffer
+
+  SYNOPSIS
+    put_record()
+
+  DESCRIPTION
+    This implementation of the virtual function put_record writes the next
+    matching record into the join buffer of the JOIN_CACHE_BKA_UNIQUE class.
+    Additionally to what the default implementation does this function
+    performs the following. 
+    It extracts from the record the key value used in lookups for matching
+    records and searches for this key in the hash tables from the join cache.
+    If it finds the key in the hash table it joins the record to the chain
+    of records with this key. If the key is not found in the hash table the
+    key is placed into it and a chain containing only the newly added record 
+    is attached to the key entry. The key value is either placed in the hash 
+    element added for the key or, if the use_emb_key flag is set, remains in
+    the record from the partial join.
+    
+  RETURN
+    TRUE    if it has been decided that it should be the last record
+            in the join buffer,
+    FALSE   otherwise
+*/
+
+bool JOIN_CACHE_BKA_UNIQUE::put_record()
+{
+  bool is_full;
+  uchar *key;
+  uint key_len= key_length;
+  uchar *key_ref_ptr;
+  uchar *link= 0;
+  TABLE_REF *ref= &join_tab->ref;
+  uchar *next_ref_ptr= pos;
+
+  pos+= get_size_of_rec_offset();
+  /* Write the record into the join buffer */  
+  if (prev_cache)
+    link= prev_cache->get_curr_rec_link();
+  write_record_data(link, &is_full);
+
+  if (use_emb_key)
+    key= get_curr_emb_key();
+  else
+  {
+    /* Build the key over the fields read into the record buffers */ 
+    cp_buffer_from_ref(join->thd, join_tab->table, ref);
+    key= ref->key_buff;
+  }
+
+  /* Look for the key in the hash table */
+  if (key_search(key, key_len, &key_ref_ptr))
+  {
+    uchar *last_next_ref_ptr;
+    /* 
+      The key is found in the hash table. 
+      Add the record to the circular list of the records attached to this key.
+      Below 'rec' is the record to be added into the record chain for the found
+      key, 'key_ref' points to a flatten representation of the st_key_entry 
+      structure that contains the key and the head of the record chain.
+    */
+    last_next_ref_ptr= get_next_rec_ref(key_ref_ptr+get_size_of_key_offset());
+    /* rec->next_rec= key_entry->last_rec->next_rec */
+    memcpy(next_ref_ptr, last_next_ref_ptr, get_size_of_rec_offset());
+    /* key_entry->last_rec->next_rec= rec */ 
+    store_next_rec_ref(last_next_ref_ptr, next_ref_ptr);
+    /* key_entry->last_rec= rec */
+    store_next_rec_ref(key_ref_ptr+get_size_of_key_offset(), next_ref_ptr);
+  }
+  else
+  {
+    /* 
+      The key is not found in the hash table.
+      Put the key into the join buffer linking it with the keys for the
+      corresponding hash entry. Create a circular list with one element
+      referencing the record and attach the list to the key in the buffer.
+    */
+    uchar *cp= last_key_entry;
+    cp-= get_size_of_rec_offset()+get_size_of_key_offset();
+    store_next_key_ref(key_ref_ptr, cp);
+    store_null_key_ref(cp);
+    store_next_rec_ref(next_ref_ptr, next_ref_ptr);
+    store_next_rec_ref(cp+get_size_of_key_offset(), next_ref_ptr);
+    if (use_emb_key)
+    {
+      cp-= get_size_of_rec_offset();
+      store_emb_key_ref(cp, key);
+    }
+    else
+    {
+      cp-= key_len;
+      memcpy(cp, key, key_len);
+    }
+    last_key_entry= cp;
+    /* Increment the counter of key_entries in the hash table */ 
+    key_entries++;
+  }  
+  return is_full;
+}
+
+
+/*
+  Read the next record from the JOIN_CACHE_BKA_UNIQUE buffer
+
+  SYNOPSIS
+    get_record()
+
+  DESCRIPTION
+    Additionally to what the default implementation of the virtual 
+    function get_record does this implementation skips the link element
+    used to connect the records with the same key into a chain. 
+
+  RETURN
+    TRUE  - there are no more records to read from the join buffer
+    FALSE - otherwise
+*/
+
+bool JOIN_CACHE_BKA_UNIQUE::get_record()
+{ 
+  pos+= get_size_of_rec_offset();
+  return this->JOIN_CACHE::get_record();
+}
+
+
+/* 
+  Skip record from the JOIN_CACHE_BKA_UNIQUE join buffer if its match flag is on
+
+  SYNOPSIS
+    skip_record_if_match()
+
+  DESCRIPTION
+    This implementation of the virtual function skip_record_if_match does
+    the same as the default implementation does, but it takes into account
+    the link element used to connect the records with the same key into a chain. 
+
+  RETURN
+    TRUE  - the match flag is on and the record has been skipped
+    FALSE - the match flag is off 
+*/
+
+bool JOIN_CACHE_BKA_UNIQUE::skip_record_if_match()
+{
+  uchar *save_pos= pos;
+  pos+= get_size_of_rec_offset();
+  if (!this->JOIN_CACHE::skip_record_if_match())
+  {
+    pos= save_pos;
+    return FALSE;
+  }
+  return TRUE;
+}
+
+
+/* 
+  Search for a key in the hash table of the join buffer
+
+  SYNOPSIS
+    key_search()
+      key             pointer to the key value
+      key_len         key value length
+      key_ref_ptr OUT position of the reference to the next key from 
+                      the hash element for the found key , or
+                      a position where the reference to the the hash 
+                      element for the key is to be added in the
+                      case when the key has not been found
+      
+  DESCRIPTION
+    The function looks for a key in the hash table of the join buffer.
+    If the key is found the functionreturns the position of the reference
+    to the next key from  to the hash element for the given key. 
+    Otherwise the function returns the position where the reference to the
+    newly created hash element for the given key is to be added.  
+
+  RETURN
+    TRUE  - the key is found in the hash table
+    FALSE - otherwise
+*/
+
+bool JOIN_CACHE_BKA_UNIQUE::key_search(uchar *key, uint key_len,
+                                       uchar **key_ref_ptr) 
+{
+  bool is_found= FALSE;
+  uint idx= get_hash_idx(key, key_length);
+  uchar *ref_ptr= hash_table+size_of_key_ofs*idx;
+  while (!is_null_key_ref(ref_ptr))
+  {
+    uchar *next_key;
+    ref_ptr= get_next_key_ref(ref_ptr);
+    next_key= use_emb_key ? get_emb_key(ref_ptr-get_size_of_rec_offset()) :
+                            ref_ptr-key_length;
+
+    if (memcmp(next_key, key, key_len) == 0)
+    {
+      is_found= TRUE;
+      break;
+    }
+  }
+  *key_ref_ptr= ref_ptr;
+  return is_found;
+} 
+
+
+/* 
+  Calclulate hash value for a key in the hash table of the join buffer
+
+  SYNOPSIS
+    get_hash_idx()
+      key             pointer to the key value
+      key_len         key value length
+      
+  DESCRIPTION
+    The function calculates an index of the hash entry in the hash table
+    of the join buffer for the given key  
+
+  RETURN
+    the calculated index of the hash entry for the given key.  
+*/
+
+uint JOIN_CACHE_BKA_UNIQUE::get_hash_idx(uchar* key, uint key_len)
+{
+  ulong nr= 1;
+  ulong nr2= 4;
+  uchar *pos= key;
+  uchar *end= key+key_len;
+  for (; pos < end ; pos++)
+  {
+    nr^= (ulong) ((((uint) nr & 63)+nr2)*((uint) *pos))+ (nr << 8);
+    nr2+= 3;
+  }
+  return nr % hash_entries;
+}
+
+
+/* 
+  Clean up the hash table of the join buffer
+
+  SYNOPSIS
+    cleanup_hash_table()
+      key             pointer to the key value
+      key_len         key value length
+      
+  DESCRIPTION
+    The function cleans up the hash table in the join buffer removing all
+    hash elements from the table. 
+
+  RETURN
+    none  
+*/
+
+void JOIN_CACHE_BKA_UNIQUE:: cleanup_hash_table()
+{
+  last_key_entry= hash_table;
+  bzero(hash_table, (buff+buff_size)-hash_table);
+  key_entries= 0;
+}
+
+
+/*
+  Initialize retrieval of range sequence for BKA_UNIQUE algorithm
+    
+  SYNOPSIS
+    bka_range_seq_init()
+      init_params   pointer to the BKA_INIQUE join cache object
+      n_ranges      the number of ranges obtained 
+      flags         combination of HA_MRR_SINGLE_POINT, HA_MRR_FIXED_KEY
+
+  DESCRIPTION
+    The function interprets init_param as a pointer to a JOIN_CACHE_BKA_UNIQUE
+    object. The function prepares for an iteration over the unique join keys
+    built over the records from the cache join buffer.
+
+  NOTE
+    This function are used only as a callback function.    
+
+  RETURN
+    init_param    value that is to be used as a parameter of 
+                  bka_unique_range_seq_next()
+*/    
+
+static 
+range_seq_t bka_unique_range_seq_init(void *init_param, uint n_ranges,
+                                      uint flags)
+{
+  DBUG_ENTER("bka_unique_range_seq_init");
+  JOIN_CACHE_BKA_UNIQUE *cache= (JOIN_CACHE_BKA_UNIQUE *) init_param;
+  cache->reset(0);
+  DBUG_RETURN((range_seq_t) init_param);
+}
+
+
+/*
+  Get the key over the next record from the join buffer used by BKA_UNIQUE  
+    
+  SYNOPSIS
+    bka_unique_range_seq_next()
+      seq        value returned by  bka_unique_range_seq_init()
+      range  OUT reference to the next range
+  
+  DESCRIPTION
+    The function interprets seq as a pointer to the JOIN_CACHE_BKA_UNIQUE 
+    object. The function returns a pointer to the range descriptor
+    for the next unique key built over records from the join buffer.
+
+  NOTE
+    This function are used only as a callback function.
+   
+  RETURN
+    0    ok, the range structure filled with info about the next key
+    1    no more ranges
+*/    
+
+static 
+uint bka_unique_range_seq_next(range_seq_t rseq, KEY_MULTI_RANGE *range)
+{
+  DBUG_ENTER("bka_unique_range_seq_next");
+  JOIN_CACHE_BKA_UNIQUE *cache= (JOIN_CACHE_BKA_UNIQUE *) rseq;
+  TABLE_REF *ref= &cache->join_tab->ref;
+  key_range *start_key= &range->start_key;
+  if ((start_key->length= cache->get_next_key((uchar **) &start_key->key)))
+  {
+    start_key->keypart_map= (1 << ref->key_parts) - 1;
+    start_key->flag= HA_READ_KEY_EXACT;
+    range->end_key= *start_key;
+    range->end_key.flag= HA_READ_AFTER_KEY;
+    range->ptr= (char *) cache->get_curr_key_chain();
+    range->range_flag= EQ_RANGE;
+    DBUG_RETURN(0);
+  } 
+  DBUG_RETURN(1);
+}
+
+
+/*
+  Check whether range_info orders to skip the next record from BKA_UNIQUE buffer
+
+  SYNOPSIS
+    bka_unique_range_seq_skip_record()
+      seq              value returned by bka_unique_range_seq_init()
+      range_info       information about the next range
+      rowid [NOT USED] rowid of the record to be checked (not used)
+    
+  DESCRIPTION
+    The function interprets seq as a pointer to the JOIN_CACHE_BKA_UNIQUE
+    object. The function returns TRUE if the record with this range_info
+    is to be filtered out from the stream of records returned by
+    multi_range_read_next(). 
+
+  NOTE
+    This function are used only as a callback function.
+
+  RETURN
+    1    record with this range_info is to be filtered out from the stream
+         of records returned by multi_range_read_next()
+    0    the record is to be left in the stream
+*/ 
+
+static 
+bool bka_unique_range_seq_skip_record(range_seq_t rseq, char *range_info,
+                                      uchar *rowid)
+{
+  DBUG_ENTER("bka_unique_range_seq_skip_record");
+  JOIN_CACHE_BKA_UNIQUE *cache= (JOIN_CACHE_BKA_UNIQUE *) rseq;
+  bool res= cache->check_all_match_flags_for_key((uchar *) range_info);
+  DBUG_RETURN(res);
+}
+
+ 
+/*
+  Check if the record combination matches the index condition
+
+  SYNOPSIS
+    JOIN_CACHE_BKA_UNIQUE::skip_index_tuple()
+      rseq             Value returned by bka_range_seq_init()
+      range_info       MRR range association data
+    
+  DESCRIPTION
+    See JOIN_CACHE_BKA::skip_index_tuple().
+    This function is the variant for use with
+    JOIN_CACHE_BKA_UNIQUE. The difference from JOIN_CACHE_BKA case is that
+    there may be multiple previous table record combinations that share the
+    same key, i.e. they map to the same MRR range.
+    As a consequence, we need to loop through all previous table record
+    combinations that match the given MRR range key range_info until we find
+    one that satisfies the index condition.
+
+  NOTE
+    Possible optimization:
+    Before we unpack the record from a previous table
+    check if this table is used in the condition.
+    If so then unpack the record otherwise skip the unpacking.
+    This should be done by a special virtual method
+    get_partial_record_by_pos().
+
+  RETURN
+    0    The record combination satisfies the index condition
+    1    Otherwise
+
+
+*/
+
+bool JOIN_CACHE_BKA_UNIQUE::skip_index_tuple(range_seq_t rseq, char *range_info)
+{
+  DBUG_ENTER("JOIN_CACHE_BKA_UNIQUE::skip_index_tuple");
+  JOIN_CACHE_BKA_UNIQUE *cache= (JOIN_CACHE_BKA_UNIQUE *) rseq;
+  uchar *last_rec_ref_ptr=  cache->get_next_rec_ref((uchar*) range_info);
+  uchar *next_rec_ref_ptr= last_rec_ref_ptr;
+  do
+  {
+    next_rec_ref_ptr= cache->get_next_rec_ref(next_rec_ref_ptr);
+    uchar *rec_ptr= next_rec_ref_ptr + cache->rec_fields_offset;
+    cache->get_record_by_pos(rec_ptr);
+    if (join_tab->cache_idx_cond->val_int())
+      DBUG_RETURN(FALSE);
+  } while(next_rec_ref_ptr != last_rec_ref_ptr);
+  DBUG_RETURN(TRUE);
+}
+
+
+/*
+  Check if the record combination matches the index condition
+
+  SYNOPSIS
+    bka_unique_skip_index_tuple()
+      rseq             Value returned by bka_range_seq_init()
+      range_info       MRR range association data
+    
+  DESCRIPTION
+    This is wrapper for JOIN_CACHE_BKA_UNIQUE::skip_index_tuple method,
+    see comments there.
+
+  NOTE
+    This function is used as a RANGE_SEQ_IF::skip_index_tuple callback.
+ 
+  RETURN
+    0    The record combination satisfies the index condition
+    1    Otherwise
+*/
+
+static 
+bool bka_unique_skip_index_tuple(range_seq_t rseq, char *range_info)
+{
+  DBUG_ENTER("bka_unique_skip_index_tuple");
+  JOIN_CACHE_BKA_UNIQUE *cache= (JOIN_CACHE_BKA_UNIQUE *) rseq;
+  DBUG_RETURN(cache->skip_index_tuple(rseq, range_info));
+}
+
+
+/*
+  Using BKA_UNIQUE find matches from the next table for records from join buffer   
+
+  SYNOPSIS
+    join_matching_records()
+      skip_last    do not look for matches for the last partial join record 
+
+  DESCRIPTION
+    This function can be used only when the table join_tab can be accessed
+    by keys built over the fields of previous join tables.
+    The function retrieves all keys from the hash table of the join buffer
+    built for partial join records from the buffer. For each of these keys
+    the function performs an index lookup and tries to match records yielded
+    by this lookup with records from the join buffer attached to the key.
+    If a match is found the function will call the sub_select function trying
+    to look for matches for the remaining join operations.
+    This function does not assume that matching records are necessarily
+    returned with references to the keys by which they were found. If the call
+    of the function multi_range_read_init returns flags with
+    HA_MRR_NO_ASSOCIATION then a search for the key built from the returned
+    record is carried on. The search is performed by probing in in the hash
+    table of the join buffer.
+    This function currently is called only from the function join_records.    
+    It's assumed that this function is always called with the skip_last 
+    parameter equal to false.
+            
+  RETURN
+    return one of enum_nested_loop_state 
+*/
+
+enum_nested_loop_state 
+JOIN_CACHE_BKA_UNIQUE::join_matching_records(bool skip_last)
+{
+  int error;
+  uchar *key_chain_ptr;
+  handler *file= join_tab->table->file;
+  enum_nested_loop_state rc= NESTED_LOOP_OK;
+  bool check_only_first_match= join_tab->check_only_first_match();
+  bool no_association= test(mrr_mode &  HA_MRR_NO_ASSOCIATION);
+
+  /* Set functions to iterate over keys in the join buffer */
+  RANGE_SEQ_IF seq_funcs= { bka_unique_range_seq_init,
+                            bka_unique_range_seq_next,
+                            check_only_first_match && !no_association ?
+                              bka_unique_range_seq_skip_record : 0,
+                            join_tab->cache_idx_cond ?
+                              bka_unique_skip_index_tuple : 0  };
+
+  /* The value of skip_last must be always FALSE when this function is called */
+  DBUG_ASSERT(!skip_last);
+
+  /* Return at once if there are no records in the join buffer */
+  if (!records)
+    return NESTED_LOOP_OK;  
+                   
+  rc= init_join_matching_records(&seq_funcs, key_entries);
+  if (rc != NESTED_LOOP_OK)
+    goto finish;
+
+  while (!(error= file->multi_range_read_next((char **) &key_chain_ptr)))
+  {
+    if (no_association)
+    {
+      uchar *key_ref_ptr;
+      TABLE *table= join_tab->table;
+      TABLE_REF *ref= &join_tab->ref;
+      KEY *keyinfo= table->key_info+ref->key;
+      /* 
+        Build the key value out of  the record returned by the call of
+        multi_range_read_next in the record buffer
+      */ 
+      key_copy(ref->key_buff, table->record[0], keyinfo, ref->key_length);
+      /* Look for this key in the join buffer */
+      if (!key_search(ref->key_buff, ref->key_length, &key_ref_ptr))
+	continue;
+      key_chain_ptr= key_ref_ptr+get_size_of_key_offset();
+    } 
+
+    uchar *last_rec_ref_ptr= get_next_rec_ref(key_chain_ptr);
+    uchar *next_rec_ref_ptr= last_rec_ref_ptr;
+    do
+    {
+      next_rec_ref_ptr= get_next_rec_ref(next_rec_ref_ptr);
+      uchar *rec_ptr= next_rec_ref_ptr+rec_fields_offset;
+
+      if (join->thd->killed)
+      {
+        /* The user has aborted the execution of the query */
+        join->thd->send_kill_message();
+        rc= NESTED_LOOP_KILLED; 
+        goto finish;
+      }
+      /* 
+        If only the first match is needed and it has been already found
+        for the associated partial join record then the returned candidate
+        is discarded.
+      */
+      if (rc == NESTED_LOOP_OK &&
+          (!check_only_first_match || !get_match_flag_by_pos(rec_ptr)))
+      {
+        get_record_by_pos(rec_ptr);
+        rc= generate_full_extensions(rec_ptr);
+        if (rc != NESTED_LOOP_OK && rc != NESTED_LOOP_NO_MORE_ROWS)
+	  goto finish;   
+      }
+    }
+    while (next_rec_ref_ptr != last_rec_ref_ptr); 
+  }
+
+  if (error > 0 && error != HA_ERR_END_OF_FILE)	   
+    return NESTED_LOOP_ERROR; 
+finish:                  
+  return end_join_matching_records(rc);
+}
+
+
+/*
+  Check whether all records in a key chain have their match flags set on   
+
+  SYNOPSIS
+    check_all_match_flags_for_key()
+      key_chain_ptr     
+
+  DESCRIPTION
+    This function retrieves records in the given circular chain and checks
+    whether their match flags are set on. The parameter key_chain_ptr shall
+    point to the position in the join buffer storing the reference to the
+    last element of this chain. 
+            
+  RETURN
+    TRUE   if each retrieved record has its match flag set on
+    FALSE  otherwise 
+*/
+
+bool JOIN_CACHE_BKA_UNIQUE::check_all_match_flags_for_key(uchar *key_chain_ptr)
+{
+  uchar *last_rec_ref_ptr= get_next_rec_ref(key_chain_ptr);
+  uchar *next_rec_ref_ptr= last_rec_ref_ptr;
+  do
+  {
+    next_rec_ref_ptr= get_next_rec_ref(next_rec_ref_ptr);
+    uchar *rec_ptr= next_rec_ref_ptr+rec_fields_offset;
+    if (!get_match_flag_by_pos(rec_ptr))
+      return FALSE;
+  }
+  while (next_rec_ref_ptr != last_rec_ref_ptr);
+  return TRUE;
+}
+  
+
+/* 
+  Get the next key built for the records from BKA_UNIQUE join buffer
+
+  SYNOPSIS
+    get_next_key()
+      key    pointer to the buffer where the key value is to be placed
+
+  DESCRIPTION
+    The function reads the next key value stored in the hash table of the
+    join buffer. Depending on the value of the use_emb_key flag of the
+    join cache the value is read either from the table itself or from
+    the record field where it occurs. 
+
+  RETURN
+    length of the key value - if the starting value of 'cur_key_entry' refers
+    to the position after that referred by the the value of 'last_key_entry'    
+    0 - otherwise.     
+*/
+
+uint JOIN_CACHE_BKA_UNIQUE::get_next_key(uchar ** key)
+{  
+  if (curr_key_entry == last_key_entry)
+    return 0;
+
+  curr_key_entry-= key_entry_length;
+
+  *key = use_emb_key ? get_emb_key(curr_key_entry) : curr_key_entry;
+
+  DBUG_ASSERT(*key >= buff && *key < hash_table);
+
+  return key_length;
+}
+
+
+/****************************************************************************
+ * Join cache module end
+ ****************************************************************************/

=== modified file 'sql/sql_select.cc'
--- a/sql/sql_select.cc	2009-12-15 17:23:55 +0000
+++ b/sql/sql_select.cc	2009-12-21 02:26:15 +0000
@@ -94,7 +94,7 @@ static store_key *get_store_key(THD *thd
 				uint maybe_null);
 static void make_outerjoin_info(JOIN *join);
 static bool make_join_select(JOIN *join,SQL_SELECT *select,COND *item);
-static void make_join_readinfo(JOIN *join, ulonglong options);
+static bool make_join_readinfo(JOIN *join, ulonglong options, uint no_jbuf_after);
 static bool only_eq_ref_tables(JOIN *join, ORDER *order, table_map tables);
 static void update_depend_map(JOIN *join);
 static void update_depend_map(JOIN *join, ORDER *order);
@@ -165,7 +165,7 @@ static int join_no_more_records(READ_REC
 static int join_read_next(READ_RECORD *info);
 static int join_init_quick_read_record(JOIN_TAB *tab);
 static int test_if_quick_select(JOIN_TAB *tab);
-static int join_init_read_record(JOIN_TAB *tab);
+static bool test_if_use_dynamic_range_scan(JOIN_TAB *join_tab);
 static int join_read_first(JOIN_TAB *tab);
 static int join_read_next(READ_RECORD *info);
 static int join_read_next_same(READ_RECORD *info);
@@ -199,14 +199,7 @@ static int remove_dup_with_compare(THD *
 				   ulong offset,Item *having);
 static int remove_dup_with_hash_index(THD *thd,TABLE *table,
 				      uint field_count, Field **first_field,
-
 				      ulong key_length,Item *having);
-static int join_init_cache(THD *thd,JOIN_TAB *tables,uint table_count);
-static ulong used_blob_length(CACHE_FIELD **ptr);
-static bool store_record_in_cache(JOIN_CACHE *cache);
-static void reset_cache_read(JOIN_CACHE *cache);
-static void reset_cache_write(JOIN_CACHE *cache);
-static void read_cached_record(JOIN_TAB *tab);
 static bool cmp_buffer_with_ref(JOIN_TAB *tab);
 static bool setup_new_fields(THD *thd, List<Item> &fields,
 			     List<Item> &all_fields, ORDER *new_order);
@@ -242,6 +235,7 @@ static Item *remove_additional_cond(Item
 static void add_group_and_distinct_keys(JOIN *join, JOIN_TAB *join_tab);
 static bool test_if_ref(COND *root_cond, 
                         Item_field *left_item,Item *right_item);
+static uint make_join_orderinfo(JOIN *join);
 
 /**
   This handles SELECT with and without UNION.
@@ -776,6 +770,9 @@ static void save_index_subquery_explain_
 int
 JOIN::optimize()
 {
+  ulonglong select_opts_for_readinfo;
+  uint no_jbuf_after;
+
   DBUG_ENTER("JOIN::optimize");
   // to prevent double initialization on EXPLAIN
   if (optimized)
@@ -1268,12 +1265,23 @@ JOIN::optimize()
 	      (group_list && order) ||
 	      test(select_options & OPTION_BUFFER_RESULT)));
 
-  // No cache for MATCH
-  make_join_readinfo(this,
-		     (select_options & (SELECT_DESCRIBE |
-					SELECT_NO_JOIN_CACHE)) |
-		     (select_lex->ftfunc_list->elements ?
-		      SELECT_NO_JOIN_CACHE : 0));
+  /*
+    If the hint FORCE INDEX FOR ORDER BY/GROUP BY is used for the table
+    whose columns are required to be returned in a sorted order, then
+    the proper value for no_jbuf_after should be yielded by a call to
+    the make_join_orderinfo function.
+    Yet the current implementation of FORCE INDEX hints does not
+    allow us to do it in a clean manner.
+  */
+  no_jbuf_after= 1 ? tables : make_join_orderinfo(this);
+
+  select_opts_for_readinfo=
+    (select_options & (SELECT_DESCRIBE | SELECT_NO_JOIN_CACHE)) |
+    (select_lex->ftfunc_list->elements ?  SELECT_NO_JOIN_CACHE : 0);
+
+  // No cache for MATCH == 'Don't use join buffering when we use MATCH'.
+  if (make_join_readinfo(this, select_opts_for_readinfo, no_jbuf_after))
+    DBUG_RETURN(1);
 
   /* Perform FULLTEXT search before all regular searches */
   if (!(select_options & SELECT_DESCRIBE))
@@ -5418,13 +5426,14 @@ find_best(JOIN *join,table_map rest_tabl
   Find how much space the prevous read not const tables takes in cache.
 */
 
-static void calc_used_field_length(THD *thd, JOIN_TAB *join_tab)
+void calc_used_field_length(THD *thd, JOIN_TAB *join_tab)
 {
   uint null_fields,blobs,fields,rec_length;
   Field **f_ptr,*field;
-  MY_BITMAP *read_set= join_tab->table->read_set;;
+  uint uneven_bit_fields;
+  MY_BITMAP *read_set= join_tab->table->read_set;
 
-  null_fields= blobs= fields= rec_length=0;
+  uneven_bit_fields= null_fields= blobs= fields= rec_length=0;
   for (f_ptr=join_tab->table->field ; (field= *f_ptr) ; f_ptr++)
   {
     if (bitmap_is_set(read_set, field->field_index))
@@ -5436,21 +5445,26 @@ static void calc_used_field_length(THD *
 	blobs++;
       if (!(flags & NOT_NULL_FLAG))
 	null_fields++;
+      if (field->type() == MYSQL_TYPE_BIT &&
+          ((Field_bit*)field)->bit_len)
+        uneven_bit_fields++;
     }
   }
-  if (null_fields)
+  if (null_fields || uneven_bit_fields)
     rec_length+=(join_tab->table->s->null_fields+7)/8;
   if (join_tab->table->maybe_null)
     rec_length+=sizeof(my_bool);
   if (blobs)
   {
     uint blob_length=(uint) (join_tab->table->file->stats.mean_rec_length-
-			     (join_tab->table->s->reclength- rec_length));
+			     (join_tab->table->s->reclength-rec_length));
     rec_length+=(uint) max(4,blob_length);
   }
   join_tab->used_fields=fields;
   join_tab->used_fieldlength=rec_length;
   join_tab->used_blobs=blobs;
+  join_tab->used_null_fields= null_fields;
+  join_tab->used_uneven_bit_fields= uneven_bit_fields;
 }
 
 
@@ -5873,7 +5887,9 @@ JOIN::make_simple_join(JOIN *parent, TAB
   row_limit= unit->select_limit_cnt;
   do_send_rows= row_limit ? 1 : 0;
 
-  join_tab->cache.buff=0;			/* No caching */
+  join_tab->use_join_cache= FALSE;
+  join_tab->cache=0;			        /* No caching */
+  join_tab->cache_select= 0;
   join_tab->table=tmp_table;
   join_tab->select=0;
   join_tab->set_select_cond(NULL, __LINE__);
@@ -6417,7 +6433,8 @@ make_join_select(JOIN *join,SQL_SELECT *
 	      2 : 1;
 	    sel->read_tables= used_tables & ~current_map;
 	  }
-	  if (i != join->const_tables && tab->use_quick != 2)
+	  if (i != join->const_tables && tab->use_quick != 2 &&
+              !tab->first_inner)
 	  {					/* Read with cache */
 	    if (cond &&
                 (tmp=make_cond_for_table(cond,
@@ -6426,10 +6443,10 @@ make_join_select(JOIN *join,SQL_SELECT *
 					 current_map)))
 	    {
               DBUG_EXECUTE("where",print_where(tmp,"cache", QT_ORDINARY););
-	      tab->cache.select=(SQL_SELECT*)
+	      tab->cache_select=(SQL_SELECT*)
 		thd->memdup((uchar*) sel, sizeof(SQL_SELECT));
-	      tab->cache.select->cond=tmp;
-	      tab->cache.select->read_tables=join->const_table_map;
+	      tab->cache_select->cond=tmp;
+	      tab->cache_select->read_tables=join->const_table_map;
 	    }
 	  }
 	}
@@ -6465,6 +6482,8 @@ make_join_select(JOIN *join,SQL_SELECT *
           if (!cond_tab->select_cond)
 	    DBUG_RETURN(1);
           cond_tab->select_cond->quick_fix_field();
+          if (cond_tab->select)
+            cond_tab->select->cond= cond_tab->select_cond; 
         }       
       }
 
@@ -6530,8 +6549,338 @@ make_join_select(JOIN *join,SQL_SELECT *
   DBUG_RETURN(0);
 }
 
-static void
-make_join_readinfo(JOIN *join, ulonglong options)
+/*
+  Determine {after which table we'll produce ordered set} 
+
+  SYNOPSIS
+    make_join_orderinfo()
+     join
+
+   
+  DESCRIPTION 
+    Determine if the set is already ordered for ORDER BY, so it can 
+    disable join cache because it will change the ordering of the results.
+    Code handles sort table that is at any location (not only first after 
+    the const tables) despite the fact that it's currently prohibited.
+    We must disable join cache if the first non-const table alone is
+    ordered. If there is a temp table the ordering is done as a last
+    operation and doesn't prevent join cache usage.
+
+  RETURN
+    Number of table after which the set will be ordered
+    join->tables if we don't need an ordered set 
+*/
+
+static uint make_join_orderinfo(JOIN *join)
+{
+  JOIN_TAB *tab;
+  if (join->need_tmp)
+    return join->tables;
+  tab= join->get_sort_by_join_tab();
+  return tab ? tab-join->join_tab : join->tables;
+}
+
+/*
+  Deny usage of join buffer for the specified table
+
+  SYNOPSIS
+    set_join_cache_denial()
+      tab    join table for which join buffer usage is to be denied  
+     
+  DESCRIPTION
+    The function denies usage of join buffer when joining the table 'tab'.
+    The table is marked as not employing any join buffer. If a join cache
+    object has been already allocated for the table this object is destroyed.
+
+  RETURN
+    none    
+*/
+
+static
+void set_join_cache_denial(JOIN_TAB *join_tab)
+{
+  if (join_tab->cache)
+  {
+    join_tab->cache->free();
+    join_tab->cache= 0;
+  }
+  if (join_tab->use_join_cache)
+  {
+    join_tab->use_join_cache= FALSE;
+    /*
+      It could be only sub_select(). It could not be sub_seject_sjm because we
+      don't do join buffering for the first table in sjm nest. 
+    */
+    join_tab[-1].next_select= sub_select;
+  }
+}
+
+
+/* 
+  Revise usage of join buffer for the specified table and the whole nest   
+
+  SYNOPSIS
+    revise_cache_usage()
+      tab    join table for which join buffer usage is to be revised  
+
+  DESCRIPTION
+    The function revise the decision to use a join buffer for the table 'tab'.
+    If this table happened to be among the inner tables of a nested outer join/
+    semi-join the functions denies usage of join buffers for all of them
+
+  RETURN
+    none    
+*/
+
+static
+void revise_cache_usage(JOIN_TAB *join_tab)
+{
+  JOIN_TAB *tab;
+  JOIN_TAB *first_inner;
+
+  if (join_tab->first_inner)
+  {
+    JOIN_TAB *end_tab= join_tab;
+    for (first_inner= join_tab->first_inner; 
+         first_inner;
+         first_inner= first_inner->first_upper)           
+    {
+      for (tab= end_tab-1; tab >= first_inner; tab--)
+        set_join_cache_denial(tab);
+      end_tab= first_inner;
+    }
+  }
+  else if (join_tab->first_sj_inner_tab)
+  {
+    first_inner= join_tab->first_sj_inner_tab;
+    for (tab= join_tab-1; tab >= first_inner; tab--)
+    {
+      if (tab->first_sj_inner_tab == first_inner)
+        set_join_cache_denial(tab);
+    }
+  }
+  else set_join_cache_denial(join_tab);
+}
+
+
+/* 
+  Check whether a join buffer can be used to join the specified table   
+
+  SYNOPSIS
+    check_join_cache_usage()
+      tab                 joined table to check join buffer usage for
+      join                join for which the check is performed
+      options             options of the join
+      no_jbuf_after       don't use join buffering after table with this number
+      icp_other_tables_ok OUT TRUE if condition pushdown supports
+                          other tables presence
+
+  DESCRIPTION
+    The function finds out whether the table 'tab' can be joined using a join
+    buffer. This check is performed after the best execution plan for 'join'
+    has been chosen. If the function decides that a join buffer can be employed
+    then it selects the most appropriate join cache object that contains this
+    join buffer.
+    The result of the check and the type of the the join buffer to be used
+    depend on:
+      - the access method to access rows of the joined table
+      - whether the join table is an inner table of an outer join or semi-join
+      - the join cache level set for the query
+      - the join 'options'.
+    In any case join buffer is not used if the number of the joined table is
+    greater than 'no_jbuf_after'. It's also never used if the value of
+    join_cache_level is equal to 0.
+    The other valid settings of join_cache_level lay in the interval 1..8.
+    If join_cache_level==1|2 then join buffer is used only for inner joins
+    with 'JT_ALL' access method.  
+    If join_cache_level==3|4 then join buffer is used for any join operation
+    (inner join, outer join, semi-join) with 'JT_ALL' access method.
+    If 'JT_ALL' access method is used to read rows of the joined table then
+    always a JOIN_CACHE_BNL object is employed.
+    If an index is used to access rows of the joined table and the value of
+    join_cache_level==5|6 then a JOIN_CACHE_BKA object is employed. 
+    If an index is used to access rows of the joined table and the value of
+    join_cache_level==7|8 then a JOIN_CACHE_BKA_UNIQUE object is employed. 
+    If the value of join_cache_level is odd then creation of a non-linked 
+    join cache is forced.
+    If the function decides that a join buffer can be used to join the table
+    'tab' then it sets the value of tab->use_join_buffer to TRUE and assigns
+    the selected join cache object to the field 'cache' of the previous
+    join table. 
+    If the function creates a join cache object it tries to initialize it. The
+    failure to do this results in an invocation of the function that destructs
+    the created object.
+ 
+  NOTES
+    An inner table of a nested outer join or a nested semi-join can be currently
+    joined only when a linked cache object is employed. In these cases setting
+    join cache level to an odd number results in denial of usage of any join
+    buffer when joining the table.
+    For a nested outer join/semi-join, currently, we either use join buffers for
+    all inner tables or for none of them. 
+    Some engines (e.g. Falcon) currently allow to use only a join cache
+    of the type JOIN_CACHE_BKA_UNIQUE when the joined table is accessed through
+    an index. For these engines setting the value of join_cache_level to 5 or 6
+    results in that no join buffer is used to join the table. 
+  
+  TODO
+    Support BKA inside SJ-Materialization nests. When doing this, we'll need
+    to only store sj-inner tables in the join buffer.
+#if 0
+        JOIN_TAB *first_tab= join->join_tab+join->const_tables;
+        uint n_tables= i-join->const_tables;
+        / *
+          We normally put all preceding tables into the join buffer, except
+          for the constant tables.
+          If we're inside a semi-join materialization nest, e.g.
+
+             outer_tbl1  outer_tbl2  ( inner_tbl1, inner_tbl2 ) ...
+                                                       ^-- we're here
+
+          then we need to put into the join buffer only the tables from
+          within the nest.
+        * /
+        if (i >= first_sjm_table && i < last_sjm_table)
+        {
+          n_tables= i - first_sjm_table; // will be >0 if we got here
+          first_tab= join->join_tab + first_sjm_table;
+        }
+#endif
+
+  RETURN
+
+    cache level if cache is used, otherwise returns 0
+*/
+
+static
+uint check_join_cache_usage(JOIN_TAB *tab,
+                            JOIN *join, ulonglong options,
+                            uint no_jbuf_after,
+                            bool *icp_other_tables_ok)
+{
+  uint flags;
+  COST_VECT cost;
+  ha_rows rows;
+  uint bufsz= 4096;
+  JOIN_CACHE *prev_cache=0;
+  uint cache_level= join->thd->variables.join_cache_level;
+  bool force_unlinked_cache= test(cache_level & 1);
+  uint i= tab - join->join_tab;
+
+  *icp_other_tables_ok= TRUE;
+  if (cache_level == 0 || i == join->const_tables)
+    return 0;
+
+  if (options & SELECT_NO_JOIN_CACHE)
+    goto no_join_cache;
+  /* 
+    psergey-todo: why the below when execution code seems to handle the
+    "range checked for each record" case?
+  */
+  if (tab->use_quick == 2)
+    goto no_join_cache;
+  /*
+    Use join cache with FirstMatch semi-join strategy only when semi-join
+    contains only one table.
+  */
+  if (tab->is_inner_table_of_semi_join_with_first_match() &&
+      !tab->is_single_inner_of_semi_join_with_first_match())
+    goto no_join_cache;
+  /*
+    Non-linked join buffers can't guarantee one match
+  */
+  if (force_unlinked_cache && 
+      (tab->is_inner_table_of_outer_join() &&
+       !tab->is_single_inner_of_outer_join()))
+    goto no_join_cache;
+
+  /*
+    Don't use join buffering if we're dictated not to by no_jbuf_after (this
+    ...)
+  */
+/* !!!NB igor: Enable the statement in the comment after backporting the SJ code
+  if (!(i <= no_jbuf_after) || tab->loosescan_match_tab || 
+      sj_is_materialize_strategy(join->best_positions[i].sj_strategy))
+    goto no_join_cache;
+*/
+
+  for (JOIN_TAB *first_inner= tab->first_inner; first_inner;
+       first_inner= first_inner->first_upper)
+  {
+    if (first_inner != tab && !first_inner->use_join_cache)
+      goto no_join_cache;
+  }
+  if (tab->first_sj_inner_tab && tab->first_sj_inner_tab != tab &&
+      !tab->first_sj_inner_tab->use_join_cache)
+    goto no_join_cache;
+  if (!tab[-1].use_join_cache)
+  {
+    /* 
+      Check whether table tab and the previous one belong to the same nest of
+      inner tables and if so do not use join buffer when joining table tab. 
+    */
+    if (tab->first_inner)
+    {
+      for (JOIN_TAB *first_inner= tab[-1].first_inner;
+           first_inner;
+           first_inner= first_inner->first_upper)
+      {
+        if (first_inner == tab->first_inner)
+          goto no_join_cache;
+      }
+    }
+    else if (tab->first_sj_inner_tab &&
+             tab->first_sj_inner_tab == tab[-1].first_sj_inner_tab)
+      goto no_join_cache; 
+  }       
+
+  if (!force_unlinked_cache)
+    prev_cache= tab[-1].cache;
+
+  switch (tab->type) {
+  case JT_ALL:
+    if (cache_level <= 2 && (tab->first_inner || tab->first_sj_inner_tab))
+      goto no_join_cache;
+    if ((options & SELECT_DESCRIBE) ||
+        (((tab->cache= new JOIN_CACHE_BNL(join, tab, prev_cache))) &&
+         !tab->cache->init()))
+    {
+      *icp_other_tables_ok= FALSE;
+      return cache_level;
+    }
+    goto no_join_cache;
+  case JT_SYSTEM:
+  case JT_CONST:
+  case JT_REF:
+  case JT_EQ_REF:
+    if (cache_level <= 4)
+      return 0;
+    flags= HA_MRR_NO_NULL_ENDPOINTS;
+    if (tab->table->covering_keys.is_set(tab->ref.key))
+      flags|= HA_MRR_INDEX_ONLY;
+    rows= tab->table->file->multi_range_read_info(tab->ref.key, 10, 20,
+                                                  &bufsz, &flags, &cost);
+    if ((rows != HA_POS_ERROR) && !(flags & HA_MRR_USE_DEFAULT_IMPL) &&
+        (!(flags & HA_MRR_NO_ASSOCIATION) || cache_level > 6) &&
+        ((options & SELECT_DESCRIBE) ||
+         (((cache_level <= 6 && 
+           (tab->cache= new JOIN_CACHE_BKA(join, tab, flags, prev_cache))) ||
+	  (cache_level > 6 &&  
+           (tab->cache= new JOIN_CACHE_BKA_UNIQUE(join, tab, flags, prev_cache)))
+           ) && !tab->cache->init())))
+      return cache_level;
+    goto no_join_cache;
+  default : ;
+  }
+
+no_join_cache:
+  if (cache_level>2)
+    revise_cache_usage(tab); 
+  return 0;
+}
+
+static bool
+make_join_readinfo(JOIN *join, ulonglong options, uint no_jbuf_after)
 {
   uint i;
   bool statistics= test(!(join->select_options & SELECT_DESCRIBE));
@@ -6543,6 +6892,7 @@ make_join_readinfo(JOIN *join, ulonglong
   {
     JOIN_TAB *tab=join->join_tab+i;
     TABLE *table=tab->table;
+    bool icp_other_tables_ok;
     tab->read_record.table= table;
     tab->read_record.file=table->file;
     tab->next_select=sub_select;		/* normal select */
@@ -6565,14 +6915,18 @@ make_join_readinfo(JOIN *join, ulonglong
     sorted= 0;                                  // only first must be sorted
     switch (tab->type) {
     case JT_SYSTEM:				// Only happens with left join
-      table->status=STATUS_NO_RECORD;
-      tab->read_first_record= join_read_system;
-      tab->read_record.read_record= join_no_more_records;
-      break;
     case JT_CONST:				// Only happens with left join
+      /* Only happens with outer joins */
       table->status=STATUS_NO_RECORD;
-      tab->read_first_record= join_read_const;
+      tab->read_first_record= tab->type == JT_SYSTEM ?
+                                join_read_system :join_read_const;
       tab->read_record.read_record= join_no_more_records;
+      if (check_join_cache_usage(tab, join, options, no_jbuf_after,
+                                 &icp_other_tables_ok))
+      {
+        tab->use_join_cache= TRUE;
+        tab[-1].next_select=sub_select_cache;
+      }
       if (table->covering_keys.is_set(tab->ref.key) &&
           !table->no_keyread)
       {
@@ -6580,7 +6934,7 @@ make_join_readinfo(JOIN *join, ulonglong
         table->file->extra(HA_EXTRA_KEYREAD);
       }
       else
-        push_index_cond(tab, tab->ref.key, TRUE);
+        push_index_cond(tab, tab->ref.key, icp_other_tables_ok);
       break;
     case JT_EQ_REF:
       table->status=STATUS_NO_RECORD;
@@ -6593,6 +6947,12 @@ make_join_readinfo(JOIN *join, ulonglong
       tab->quick=0;
       tab->read_first_record= join_read_key;
       tab->read_record.read_record= join_no_more_records;
+      if (check_join_cache_usage(tab, join, options, no_jbuf_after,
+                                 &icp_other_tables_ok))
+      {
+        tab->use_join_cache= TRUE;
+        tab[-1].next_select=sub_select_cache;
+      }
       if (table->covering_keys.is_set(tab->ref.key) &&
 	  !table->no_keyread)
       {
@@ -6600,7 +6960,7 @@ make_join_readinfo(JOIN *join, ulonglong
 	table->file->extra(HA_EXTRA_KEYREAD);
       }
       else
-        push_index_cond(tab, tab->ref.key, TRUE);
+        push_index_cond(tab, tab->ref.key, icp_other_tables_ok );
       break;
     case JT_REF_OR_NULL:
     case JT_REF:
@@ -6612,6 +6972,12 @@ make_join_readinfo(JOIN *join, ulonglong
       }
       delete tab->quick;
       tab->quick=0;
+      if (check_join_cache_usage(tab, join, options, no_jbuf_after,
+                                 &icp_other_tables_ok))
+      {
+        tab->use_join_cache= TRUE;
+        tab[-1].next_select=sub_select_cache;
+      }
       if (tab->type == JT_REF)
       {
 	tab->read_first_record= join_read_always_key;
@@ -6629,7 +6995,7 @@ make_join_readinfo(JOIN *join, ulonglong
 	table->file->extra(HA_EXTRA_KEYREAD);
       }
       else
-        push_index_cond(tab, tab->ref.key, TRUE);
+        push_index_cond(tab, tab->ref.key, icp_other_tables_ok);
       break;
     case JT_FT:
       table->status=STATUS_NO_RECORD;
@@ -6642,15 +7008,11 @@ make_join_readinfo(JOIN *join, ulonglong
         If the incoming data set is already sorted don't use cache.
       */
       table->status=STATUS_NO_RECORD;
-      if (i != join->const_tables && !(options & SELECT_NO_JOIN_CACHE) &&
-          tab->use_quick != 2 && !tab->first_inner && !ordered_set)
+      if (check_join_cache_usage(tab, join, options, no_jbuf_after,
+                                 &icp_other_tables_ok))
       {
-	if ((options & SELECT_DESCRIBE) ||
-	    !join_init_cache(join->thd,join->join_tab+join->const_tables,
-			     i-join->const_tables))
-	{
-	  tab[-1].next_select=sub_select_cache; /* Patch previous */
-	}
+        tab->use_join_cache= TRUE;
+        tab[-1].next_select=sub_select_cache;
       }
       /* These init changes read_record */
       if (tab->use_quick == 2)
@@ -6727,7 +7089,7 @@ make_join_readinfo(JOIN *join, ulonglong
 	}
         if (tab->select && tab->select->quick &&
             tab->select->quick->index != MAX_KEY && ! tab->table->key_read)
-          push_index_cond(tab, tab->select->quick->index, FALSE);
+          push_index_cond(tab, tab->select->quick->index, icp_other_tables_ok);
       }
       break;
     default:
@@ -6739,7 +7101,32 @@ make_join_readinfo(JOIN *join, ulonglong
     }
   }
   join->join_tab[join->tables-1].next_select=0; /* Set by do_select */
-  DBUG_VOID_RETURN;
+  
+/*
+    If a join buffer is used to join a table the ordering by an index
+    for the first non-constant table cannot be employed anymore.
+  */
+  for (i=join->const_tables ; i < join->tables ; i++)
+  {
+    JOIN_TAB *tab=join->join_tab+i;
+    if (tab->use_join_cache)
+    {
+      JOIN_TAB *sort_by_tab= join->get_sort_by_join_tab();
+      if (sort_by_tab && !join->need_tmp)
+      {
+        join->need_tmp= 1;
+        join->simple_order= join->simple_group= 0;
+        if (sort_by_tab->type == JT_NEXT)
+        {
+          sort_by_tab->type= JT_ALL;
+          sort_by_tab->read_first_record= join_init_read_record;
+        }
+      }
+      break;
+    }
+  }
+
+  DBUG_RETURN(FALSE);
 }
 
 
@@ -6784,8 +7171,11 @@ void JOIN_TAB::cleanup()
   select= 0;
   delete quick;
   quick= 0;
-  x_free(cache.buff);
-  cache.buff= 0;
+  if (cache)
+  {
+    cache->free();
+    cache= 0;
+  }
   limit= 0;
   if (table)
   {
@@ -11240,33 +11630,85 @@ do_select(JOIN *join,List<Item> *fields,
 }
 
 
+/*
+  Fill the join buffer with partial records, retrieve all full  matches for them   
+
+  SYNOPSIS
+    sub_select_cache()
+      join     pointer to the structure providing all context info for the query
+      join_tab the first next table of the execution plan to be retrieved
+      end_records  true when we need to perform final steps of the retrieval
+
+  DESCRIPTION
+    For a given table Ti= join_tab from the sequence of tables of the chosen 
+    execution plan T1,...,Ti,...,Tn the function just put the partial record
+    t1,...,t[i-1] into the join buffer associated with table Ti unless this
+    is the last record added into the buffer. In this case,  the function 
+    additionally finds all matching full records for all partial
+    records accumulated in the buffer, after which it cleans the buffer up.
+    If a partial join record t1,...,ti is extended utilizing a dynamic
+    range scan then it is not put into the join buffer. Rather all matching
+    records are found for it at once by the function sub_select.
+
+  NOTES
+    The function implements the algorithmic schema for both Blocked Nested
+    Loop Join and Batched Key Access Join. The difference can be seen only at
+    the level of of the implementation of the put_record and join_records
+    virtual methods for the cache object associated with the join_tab.
+    The put_record method accumulates records in the cache, while the 
+    join_records method builds all matching join records and send them into
+    the output stream.  
+      
+  RETURN
+    return one of enum_nested_loop_state, except NESTED_LOOP_NO_MORE_ROWS.
+*/ 
+
 enum_nested_loop_state
-sub_select_cache(JOIN *join,JOIN_TAB *join_tab,bool end_of_records)
+sub_select_cache(JOIN *join, JOIN_TAB *join_tab, bool end_of_records)
 {
   enum_nested_loop_state rc;
+  JOIN_CACHE *cache= join_tab->cache;
+
+  DBUG_ENTER("sub_select_cache");
+
+  /* This function cannot be called if join_tab has no associated join buffer */
+  DBUG_ASSERT(cache != NULL);
+
+  join_tab->cache->reset_join(join);
 
   if (end_of_records)
   {
-    rc= flush_cached_records(join,join_tab,FALSE);
+    rc= cache->join_records(FALSE);
     if (rc == NESTED_LOOP_OK || rc == NESTED_LOOP_NO_MORE_ROWS)
-      rc= sub_select(join,join_tab,end_of_records);
-    return rc;
+      rc= sub_select(join, join_tab, end_of_records);
+    DBUG_RETURN(rc);
   }
-  if (join->thd->killed)		// If aborted by user
+  if (join->thd->killed)
   {
+    /* The user has aborted the execution of the query */
     join->thd->send_kill_message();
-    return NESTED_LOOP_KILLED;                   /* purecov: inspected */
+    DBUG_RETURN(NESTED_LOOP_KILLED);
   }
-  if (join_tab->use_quick != 2 || test_if_quick_select(join_tab) <= 0)
+  if (!test_if_use_dynamic_range_scan(join_tab))
   {
-    if (!store_record_in_cache(&join_tab->cache))
-      return NESTED_LOOP_OK;                     // There is more room in cache
-    return flush_cached_records(join,join_tab,FALSE);
+    if (!cache->put_record())
+      DBUG_RETURN(NESTED_LOOP_OK); 
+    /* 
+      We has decided that after the record we've just put into the buffer
+      won't add any more records. Now try to find all the matching 
+      extensions for all records in the buffer.
+    */ 
+    rc= cache->join_records(FALSE);
+    DBUG_RETURN(rc);
   }
-  rc= flush_cached_records(join, join_tab, TRUE);
+  /*
+     TODO: Check whether we really need the call below and we can't do
+           without it. If it's not the case remove it.
+  */ 
+  rc= cache->join_records(TRUE);
   if (rc == NESTED_LOOP_OK || rc == NESTED_LOOP_NO_MORE_ROWS)
     rc= sub_select(join, join_tab, end_of_records);
-  return rc;
+  DBUG_RETURN(rc);
 }
 
 /**
@@ -11447,7 +11889,6 @@ sub_select(JOIN *join,JOIN_TAB *join_tab
   return rc;
 }
 
-
 /**
   Process one record of the nested loop join.
 
@@ -11642,82 +12083,6 @@ evaluate_null_complemented_join_record(J
 }
 
 
-static enum_nested_loop_state
-flush_cached_records(JOIN *join,JOIN_TAB *join_tab,bool skip_last)
-{
-  enum_nested_loop_state rc= NESTED_LOOP_OK;
-  int error;
-  READ_RECORD *info;
-
-  join_tab->table->null_row= 0;
-  if (!join_tab->cache.records)
-    return NESTED_LOOP_OK;                      /* Nothing to do */
-  if (skip_last)
-    (void) store_record_in_cache(&join_tab->cache); // Must save this for later
-  if (join_tab->use_quick == 2)
-  {
-    if (join_tab->select->quick)
-    {					/* Used quick select last. reset it */
-      delete join_tab->select->quick;
-      join_tab->select->quick=0;
-    }
-  }
- /* read through all records */
-  if ((error=join_init_read_record(join_tab)))
-  {
-    reset_cache_write(&join_tab->cache);
-    return error < 0 ? NESTED_LOOP_NO_MORE_ROWS: NESTED_LOOP_ERROR;
-  }
-
-  for (JOIN_TAB *tmp=join->join_tab; tmp != join_tab ; tmp++)
-  {
-    tmp->status=tmp->table->status;
-    tmp->table->status=0;
-  }
-
-  info= &join_tab->read_record;
-  do
-  {
-    if (join->thd->killed)
-    {
-      join->thd->send_kill_message();
-      return NESTED_LOOP_KILLED; // Aborted by user /* purecov: inspected */
-    }
-    SQL_SELECT *select=join_tab->select;
-    if (rc == NESTED_LOOP_OK)
-      update_virtual_fields(join_tab->table);
-    if (rc == NESTED_LOOP_OK &&
-        (!join_tab->cache.select || !join_tab->cache.select->skip_record()))
-    {
-      uint i;
-      reset_cache_read(&join_tab->cache);
-      for (i=(join_tab->cache.records- (skip_last ? 1 : 0)) ; i-- > 0 ;)
-      {
-	read_cached_record(join_tab);
-	if (!select || !select->skip_record())
-        {
-          rc= (join_tab->next_select)(join,join_tab+1,0);
-	  if (rc != NESTED_LOOP_OK && rc != NESTED_LOOP_NO_MORE_ROWS)
-          {
-            reset_cache_write(&join_tab->cache);
-            return rc;
-          }
-        }
-      }
-    }
-  } while (!(error=info->read_record(info)));
-
-  if (skip_last)
-    read_cached_record(join_tab);		// Restore current record
-  reset_cache_write(&join_tab->cache);
-  if (error > 0)				// Fatal error
-    return NESTED_LOOP_ERROR;                   /* purecov: inspected */
-  for (JOIN_TAB *tmp2=join->join_tab; tmp2 != join_tab ; tmp2++)
-    tmp2->table->status=tmp2->status;
-  return NESTED_LOOP_OK;
-}
-
-
 /*****************************************************************************
   The different ways to read a record
   Returns -1 if row was not found, 0 if row was found and 1 on errors
@@ -12131,8 +12496,13 @@ test_if_quick_select(JOIN_TAB *tab)
 }
 
 
-static int
-join_init_read_record(JOIN_TAB *tab)
+static 
+bool test_if_use_dynamic_range_scan(JOIN_TAB *join_tab)
+{
+    return (join_tab->use_quick == 2 && test_if_quick_select(join_tab) > 0);
+}
+
+int join_init_read_record(JOIN_TAB *tab)
 {
   if (tab->select && tab->select->quick && tab->select->quick->reset())
     return 1;
@@ -14329,252 +14699,6 @@ SORT_FIELD *make_unireg_sortorder(ORDER 
 }
 
 
-/*****************************************************************************
-  Fill join cache with packed records
-  Records are stored in tab->cache.buffer and last record in
-  last record is stored with pointers to blobs to support very big
-  records
-******************************************************************************/
-
-static int
-join_init_cache(THD *thd,JOIN_TAB *tables,uint table_count)
-{
-  reg1 uint i;
-  uint length, blobs;
-  size_t size;
-  CACHE_FIELD *copy,**blob_ptr;
-  JOIN_CACHE  *cache;
-  JOIN_TAB *join_tab;
-  DBUG_ENTER("join_init_cache");
-
-  cache= &tables[table_count].cache;
-  cache->fields=blobs=0;
-
-  join_tab=tables;
-  for (i=0 ; i < table_count ; i++,join_tab++)
-  {
-    if (!join_tab->used_fieldlength)		/* Not calced yet */
-      calc_used_field_length(thd, join_tab);
-    cache->fields+=join_tab->used_fields;
-    blobs+=join_tab->used_blobs;
-  }
-  if (!(cache->field=(CACHE_FIELD*)
-	sql_alloc(sizeof(CACHE_FIELD)*(cache->fields+table_count*2)+(blobs+1)*
-
-		  sizeof(CACHE_FIELD*))))
-  {
-    my_free((uchar*) cache->buff,MYF(0));		/* purecov: inspected */
-    cache->buff=0;				/* purecov: inspected */
-    DBUG_RETURN(1);				/* purecov: inspected */
-  }
-  copy=cache->field;
-  blob_ptr=cache->blob_ptr=(CACHE_FIELD**)
-    (cache->field+cache->fields+table_count*2);
-
-  length=0;
-  for (i=0 ; i < table_count ; i++)
-  {
-    bool have_bit_fields= FALSE;
-    uint null_fields=0,used_fields;
-    Field **f_ptr,*field;
-    MY_BITMAP *read_set= tables[i].table->read_set;
-    for (f_ptr=tables[i].table->field,used_fields=tables[i].used_fields ;
-	 used_fields ;
-	 f_ptr++)
-    {
-      field= *f_ptr;
-      if (bitmap_is_set(read_set, field->field_index))
-      {
-	used_fields--;
-	length+=field->fill_cache_field(copy);
-	if (copy->blob_field)
-	  (*blob_ptr++)=copy;
-	if (field->real_maybe_null())
-	  null_fields++;
-        if (field->type() == MYSQL_TYPE_BIT &&
-            ((Field_bit*)field)->bit_len)
-          have_bit_fields= TRUE;    
-	copy++;
-      }
-    }
-    /* Copy null bits from table */
-    if (null_fields || have_bit_fields)
-    {						/* must copy null bits */
-      copy->str= tables[i].table->null_flags;
-      copy->length= tables[i].table->s->null_bytes;
-      copy->strip=0;
-      copy->blob_field=0;
-      length+=copy->length;
-      copy++;
-      cache->fields++;
-    }
-    /* If outer join table, copy null_row flag */
-    if (tables[i].table->maybe_null)
-    {
-      copy->str= (uchar*) &tables[i].table->null_row;
-      copy->length=sizeof(tables[i].table->null_row);
-      copy->strip=0;
-      copy->blob_field=0;
-      length+=copy->length;
-      copy++;
-      cache->fields++;
-    }
-  }
-
-  cache->length=length+blobs*sizeof(char*);
-  cache->blobs=blobs;
-  *blob_ptr=0;					/* End sequentel */
-  size=max(thd->variables.join_buff_size, cache->length);
-  if (!(cache->buff=(uchar*) my_malloc(size,MYF(0))))
-    DBUG_RETURN(1);				/* Don't use cache */ /* purecov: inspected */
-  cache->end=cache->buff+size;
-  reset_cache_write(cache);
-  DBUG_RETURN(0);
-}
-
-
-static ulong
-used_blob_length(CACHE_FIELD **ptr)
-{
-  uint length,blob_length;
-  for (length=0 ; *ptr ; ptr++)
-  {
-    (*ptr)->blob_length=blob_length=(*ptr)->blob_field->get_length();
-    length+=blob_length;
-    (*ptr)->blob_field->get_ptr(&(*ptr)->str);
-  }
-  return length;
-}
-
-
-static bool
-store_record_in_cache(JOIN_CACHE *cache)
-{
-  uint length;
-  uchar *pos;
-  CACHE_FIELD *copy,*end_field;
-  bool last_record;
-
-  pos=cache->pos;
-  end_field=cache->field+cache->fields;
-
-  length=cache->length;
-  if (cache->blobs)
-    length+=used_blob_length(cache->blob_ptr);
-  if ((last_record= (length + cache->length > (size_t) (cache->end - pos))))
-    cache->ptr_record=cache->records;
-
-  /*
-    There is room in cache. Put record there
-  */
-  cache->records++;
-  for (copy=cache->field ; copy < end_field; copy++)
-  {
-    if (copy->blob_field)
-    {
-      if (last_record)
-      {
-	copy->blob_field->get_image(pos, copy->length+sizeof(char*), 
-				    copy->blob_field->charset());
-	pos+=copy->length+sizeof(char*);
-      }
-      else
-      {
-	copy->blob_field->get_image(pos, copy->length, // blob length
-				    copy->blob_field->charset());
-	memcpy(pos+copy->length,copy->str,copy->blob_length);  // Blob data
-	pos+=copy->length+copy->blob_length;
-      }
-    }
-    else
-    {
-      if (copy->strip)
-      {
-	uchar *str,*end;
-	for (str=copy->str,end= str+copy->length;
-	     end > str && end[-1] == ' ' ;
-	     end--) ;
-	length=(uint) (end-str);
-	memcpy(pos+2, str, length);
-        int2store(pos, length);
-	pos+= length+2;
-      }
-      else
-      {
-	memcpy(pos,copy->str,copy->length);
-	pos+=copy->length;
-      }
-    }
-  }
-  cache->pos=pos;
-  return last_record || (size_t) (cache->end - pos) < cache->length;
-}
-
-
-static void
-reset_cache_read(JOIN_CACHE *cache)
-{
-  cache->record_nr=0;
-  cache->pos=cache->buff;
-}
-
-
-static void reset_cache_write(JOIN_CACHE *cache)
-{
-  reset_cache_read(cache);
-  cache->records= 0;
-  cache->ptr_record= (uint) ~0;
-}
-
-
-static void
-read_cached_record(JOIN_TAB *tab)
-{
-  uchar *pos;
-  uint length;
-  bool last_record;
-  CACHE_FIELD *copy,*end_field;
-
-  last_record=tab->cache.record_nr++ == tab->cache.ptr_record;
-  pos=tab->cache.pos;
-
-  for (copy=tab->cache.field,end_field=copy+tab->cache.fields ;
-       copy < end_field;
-       copy++)
-  {
-    if (copy->blob_field)
-    {
-      if (last_record)
-      {
-	copy->blob_field->set_image(pos, copy->length+sizeof(char*),
-				    copy->blob_field->charset());
-	pos+=copy->length+sizeof(char*);
-      }
-      else
-      {
-	copy->blob_field->set_ptr(pos, pos+copy->length);
-	pos+=copy->length+copy->blob_field->get_length();
-      }
-    }
-    else
-    {
-      if (copy->strip)
-      {
-        length= uint2korr(pos);
-	memcpy(copy->str, pos+2, length);
-	memset(copy->str+length, ' ', copy->length-length);
-	pos+= 2 + length;
-      }
-      else
-      {
-	memcpy(copy->str,pos,copy->length);
-	pos+=copy->length;
-      }
-    }
-  }
-  tab->cache.pos=pos;
-  return;
-}
 
 
 /*
@@ -16734,12 +16858,9 @@ static void select_describe(JOIN *join, 
         if (keyno != MAX_KEY && keyno == table->file->pushed_idx_cond_keyno &&
             table->file->pushed_idx_cond)
           extra.append(STRING_WITH_LEN("; Using index condition"));
-        /*
-        psergey: enable the below when we backport BKA:
-
         else if (tab->cache_idx_cond)
           extra.append(STRING_WITH_LEN("; Using index condition(BKA)"));
-        */
+
         if (quick_type == QUICK_SELECT_I::QS_TYPE_ROR_UNION || 
             quick_type == QUICK_SELECT_I::QS_TYPE_ROR_INTERSECT ||
             quick_type == QUICK_SELECT_I::QS_TYPE_INDEX_MERGE)

=== modified file 'sql/sql_select.h'
--- a/sql/sql_select.h	2009-12-15 21:35:55 +0000
+++ b/sql/sql_select.h	2009-12-21 02:26:15 +0000
@@ -94,26 +94,6 @@ typedef struct st_table_ref
 } TABLE_REF;
 
 
-/**
-  CACHE_FIELD and JOIN_CACHE is used on full join to cache records in outer
-  table
-*/
-
-typedef struct st_cache_field {
-  uchar *str;
-  uint length, blob_length;
-  Field_blob *blob_field;
-  bool strip;
-} CACHE_FIELD;
-
-
-typedef struct st_join_cache {
-  uchar *buff,*pos,*end;
-  uint records,record_nr,ptr_record,fields,length,blobs;
-  CACHE_FIELD *field,**blob_ptr;
-  SQL_SELECT *select;
-} JOIN_CACHE;
-
 
 /*
   The structs which holds the join connections and join states
@@ -143,6 +123,7 @@ typedef enum_nested_loop_state
 typedef int (*Read_record_func)(struct st_join_table *tab);
 Next_select_func setup_end_select_func(JOIN *join);
 
+class JOIN_CACHE;
 
 typedef struct st_join_table {
   st_join_table() {}                          /* Remove gcc warning */
@@ -210,6 +191,9 @@ typedef struct st_join_table {
   uint		use_quick,index;
   uint		status;				///< Save status for cache
   uint		used_fields,used_fieldlength,used_blobs;
+  uint          used_null_fields;
+  uint          used_rowid_fields;
+  uint          used_uneven_bit_fields;
   enum join_type type;
   bool		cached_eq_ref_table,eq_ref_table,not_used_in_distinct;
   bool		sorted;
@@ -220,11 +204,21 @@ typedef struct st_join_table {
   */ 
   ha_rows       limit; 
   TABLE_REF	ref;
-  JOIN_CACHE	cache;
+  bool          use_join_cache;
+  JOIN_CACHE	*cache;
+  /*
+    Index condition for BKA access join
+  */
+  Item          *cache_idx_cond;
+  SQL_SELECT    *cache_select;
   JOIN		*join;
   /** Bitmap of nested joins this table is part of */
   nested_join_map embedding_map;
 
+  /* FirstMatch variables (final QEP) */
+  struct st_join_table *first_sj_inner_tab;
+  struct st_join_table *last_sj_inner_tab;
+
   void cleanup();
   inline bool is_using_loose_index_scan()
   {
@@ -232,6 +226,58 @@ typedef struct st_join_table {
             (select->quick->get_type() ==
              QUICK_SELECT_I::QS_TYPE_GROUP_MIN_MAX));
   }
+  bool check_rowid_field()
+  {
+/* !!!NB igor: enable the code in this comment after backporting the SJ code 
+    if (keep_current_rowid && !used_rowid_fields)
+    {
+      used_rowid_fields= 1;
+      used_fieldlength+= table->file->ref_length;
+    }
+*/    
+    return test(used_rowid_fields);
+  }
+  bool is_inner_table_of_semi_join_with_first_match()
+  {
+    return first_sj_inner_tab != NULL;
+  }
+  bool is_inner_table_of_outer_join()
+  {
+    return first_inner != NULL;
+  }
+  bool is_single_inner_of_semi_join_with_first_match()
+  {
+    return first_sj_inner_tab == this && last_sj_inner_tab == this;            
+  }
+  bool is_single_inner_of_outer_join()
+  {
+    return first_inner == this && first_inner->last_inner == this;
+  }
+  bool is_first_inner_for_outer_join()
+  {
+    return first_inner && first_inner == this;
+  }
+  bool use_match_flag()
+  {
+    return is_first_inner_for_outer_join() || first_sj_inner_tab == this ; 
+  }
+  bool check_only_first_match()
+  {
+    return  last_sj_inner_tab == this ||
+           (first_inner && first_inner->last_inner == this &&
+            table->reginfo.not_exists_optimize);
+  }
+  bool is_last_inner_table()
+  {
+    return (first_inner && first_inner->last_inner == this) ||
+           last_sj_inner_tab == this;
+  }
+  struct st_join_table *get_first_inner_table()
+  {
+    if (first_inner)
+      return first_inner;
+    return first_sj_inner_tab; 
+  }
   void set_select_cond(COND *to, uint line)
   {
     DBUG_PRINT("info", ("select_cond changes %p -> %p at line %u tab %p",
@@ -248,6 +294,849 @@ typedef struct st_join_table {
   }
 } JOIN_TAB;
 
+
+/* 
+  Categories of data fields of variable length written into join cache buffers.
+  The value of any of these fields is written into cache together with the
+  prepended length of the value.     
+*/
+#define CACHE_BLOB      1        /* blob field  */
+#define CACHE_STRIPPED  2        /* field stripped of trailing spaces */
+#define CACHE_VARSTR1   3        /* short string value (length takes 1 byte) */ 
+#define CACHE_VARSTR2   4        /* long string value (length takes 2 bytes) */
+
+/*
+  The CACHE_FIELD structure used to describe fields of records that
+  are written into a join cache buffer from record buffers and backward.
+*/
+typedef struct st_cache_field {
+  uchar *str;   /**< buffer from/to where the field is to be copied */ 
+  uint length;  /**< maximal number of bytes to be copied from/to str */
+  /* 
+    Field object for the moved field
+    (0 - for a flag field, see JOIN_CACHE::create_flag_fields).
+  */
+  Field *field;
+  uint type;    /**< category of the of the copied field (CACHE_BLOB et al.) */
+  /* 
+    The number of the record offset value for the field in the sequence
+    of offsets placed after the last field of the record. These
+    offset values are used to access fields referred to from other caches.
+    If the value is 0 then no offset for the field is saved in the
+    trailing sequence of offsets.
+  */ 
+  uint referenced_field_no; 
+  /* The remaining structure fields are used as containers for temp values */
+  uint blob_length; /**< length of the blob to be copied */
+  uint offset;      /**< field offset to be saved in cache buffer */
+} CACHE_FIELD;
+
+
+/*
+  JOIN_CACHE is the base class to support the implementations of both
+  Blocked-Based Nested Loops (BNL) Join Algorithm and Batched Key Access (BKA)
+  Join Algorithm. The first algorithm is supported by the derived class
+  JOIN_CACHE_BNL, while the second algorithm is supported by the derived
+  class JOIN_CACHE_BKA.
+  These two algorithms have a lot in common. Both algorithms first
+  accumulate the records of the left join operand in a join buffer and
+  then search for matching rows of the second operand for all accumulated
+  records.
+  For the first algorithm this strategy saves on logical I/O operations:
+  the entire set of records from the join buffer requires only one look-through
+  the records provided by the second operand. 
+  For the second algorithm the accumulation of records allows to optimize
+  fetching rows of the second operand from disk for some engines (MyISAM, 
+  InnoDB), or to minimize the number of round-trips between the Server and
+  the engine nodes (NDB Cluster).        
+*/ 
+
+class JOIN_CACHE :public Sql_alloc
+{
+
+private:
+
+  /* Size of the offset of a record from the cache */   
+  uint size_of_rec_ofs;    
+  /* Size of the length of a record in the cache */
+  uint size_of_rec_len;
+  /* Size of the offset of a field within a record in the cache */   
+  uint size_of_fld_ofs;
+
+protected:
+       
+  /* 3 functions below actually do not use the hidden parameter 'this' */ 
+
+  /* Calculate the number of bytes used to store an offset value */
+  uint offset_size(uint len)
+  { return (len < 256 ? 1 : len < 256*256 ? 2 : 4); }
+
+  /* Get the offset value that takes ofs_sz bytes at the position ptr */
+  ulong get_offset(uint ofs_sz, uchar *ptr)
+  {
+    switch (ofs_sz) {
+    case 1: return uint(*ptr);
+    case 2: return uint2korr(ptr);
+    case 4: return uint4korr(ptr);
+    }
+    return 0;
+  }
+
+  /* Set the offset value ofs that takes ofs_sz bytes at the position ptr */ 
+  void store_offset(uint ofs_sz, uchar *ptr, ulong ofs)
+  {
+    switch (ofs_sz) {
+    case 1: *ptr= (uchar) ofs; return;
+    case 2: int2store(ptr, (uint16) ofs); return;
+    case 4: int4store(ptr, (uint32) ofs); return;
+    }
+  }
+  
+  /* 
+    The total maximal length of the fields stored for a record in the cache.
+    For blob fields only the sizes of the blob lengths are taken into account. 
+  */
+  uint length;
+
+  /* 
+    Representation of the executed multi-way join through which all needed
+    context can be accessed.  
+  */   
+  JOIN *join;  
+
+  /* 
+    Cardinality of the range of join tables whose fields can be put into the
+    cache. (A table from the range not necessarily contributes to the cache.)
+  */
+  uint tables;
+
+  /* 
+    The total number of flag and data fields that can appear in a record
+    written into the cache. Fields with null values are always skipped 
+    to save space. 
+  */
+  uint fields;
+
+  /* 
+    The total number of flag fields in a record put into the cache. They are
+    used for table null bitmaps, table null row flags, and an optional match
+    flag. Flag fields go before other fields in a cache record with the match
+    flag field placed always at the very beginning of the record.
+  */
+  uint flag_fields;
+
+  /* The total number of blob fields that are written into the cache */ 
+  uint blobs;
+
+  /* 
+    The total number of fields referenced from field descriptors for other join
+    caches. These fields are used to construct key values to access matching
+    rows with index lookups. Currently the fields can be referenced only from
+    descriptors for bka caches. However they may belong to a cache of any type.
+  */   
+  uint referenced_fields;
+   
+  /* 
+    The current number of already created data field descriptors.
+    This number can be useful for implementations of the init methods.  
+  */
+  uint data_field_count; 
+
+  /* 
+    The current number of already created pointers to the data field
+    descriptors. This number can be useful for implementations of
+    the init methods.  
+  */
+  uint data_field_ptr_count; 
+  /* 
+    Array of the descriptors of fields containing 'fields' elements.
+    These are all fields that are stored for a record in the cache. 
+  */
+  CACHE_FIELD *field_descr;
+
+  /* 
+    Array of pointers to the blob descriptors that contains 'blobs' elements.
+  */
+  CACHE_FIELD **blob_ptr;
+
+  /* 
+    This flag indicates that records written into the join buffer contain
+    a match flag field. The flag must be set by the init method. 
+  */
+  bool with_match_flag; 
+  /*
+    This flag indicates that any record is prepended with the length of the
+    record which allows us to skip the record or part of it without reading.
+  */
+  bool with_length;
+
+  /* 
+    The maximal number of bytes used for a record representation in
+    the cache excluding the space for blob data. 
+    For future derived classes this representation may contains some
+    redundant info such as a key value associated with the record.     
+  */
+  uint pack_length;
+  /* 
+    The value of pack_length incremented by the total size of all 
+    pointers of a record in the cache to the blob data. 
+  */
+  uint pack_length_with_blob_ptrs;
+
+  /* Pointer to the beginning of the join buffer */
+  uchar *buff;         
+  /* 
+    Size of the entire memory allocated for the join buffer.
+    Part of this memory may be reserved for the auxiliary buffer.
+  */ 
+  ulong buff_size;
+  /* Size of the auxiliary buffer. */ 
+  ulong aux_buff_size;
+
+  /* The number of records put into the join buffer */ 
+  uint records;
+
+  /* 
+    Pointer to the current position in the join buffer.
+    This member is used both when writing to buffer and
+    when reading from it.
+  */
+  uchar *pos;
+  /* 
+    Pointer to the first free position in the join buffer,
+    right after the last record into it.
+  */
+  uchar *end_pos; 
+
+  /* 
+    Pointer to the beginning of first field of the current read/write record
+    from the join buffer. The value is adjusted by the get_record/put_record
+    functions.
+  */
+  uchar *curr_rec_pos;
+  /* 
+    Pointer to the beginning of first field of the last record
+    from the join buffer.
+  */
+  uchar *last_rec_pos;
+
+  /* 
+    Flag is set if the blob data for the last record in the join buffer
+    is in record buffers rather than in the join cache.
+  */
+  bool last_rec_blob_data_is_in_rec_buff;
+
+  /* 
+    Pointer to the position to the current record link. 
+    Record links are used only with linked caches. Record links allow to set
+    connections between parts of one join record that are stored in different
+    join buffers.
+    In the simplest case a record link is just a pointer to the beginning of
+    the record stored in the buffer.
+    In a more general case a link could be a reference to an array of pointers
+    to records in the buffer.   */
+  uchar *curr_rec_link;
+
+  void calc_record_fields();     
+  int alloc_fields(uint external_fields);
+  void create_flag_fields();
+  void create_remaining_fields(bool all_read_fields);
+  void set_constants();
+  int alloc_buffer();
+
+  uint get_size_of_rec_offset() { return size_of_rec_ofs; }
+  uint get_size_of_rec_length() { return size_of_rec_len; }
+  uint get_size_of_fld_offset() { return size_of_fld_ofs; }
+
+  uchar *get_rec_ref(uchar *ptr)
+  {
+    return buff+get_offset(size_of_rec_ofs, ptr-size_of_rec_ofs);
+  }
+  ulong get_rec_length(uchar *ptr)
+  { 
+    return (ulong) get_offset(size_of_rec_len, ptr);
+  }
+  ulong get_fld_offset(uchar *ptr)
+  { 
+    return (ulong) get_offset(size_of_fld_ofs, ptr);
+  }
+
+  void store_rec_ref(uchar *ptr, uchar* ref)
+  {
+    store_offset(size_of_rec_ofs, ptr-size_of_rec_ofs, (ulong) (ref-buff));
+  }
+
+  void store_rec_length(uchar *ptr, ulong len)
+  {
+    store_offset(size_of_rec_len, ptr, len);
+  }
+  void store_fld_offset(uchar *ptr, ulong ofs)
+  {
+    store_offset(size_of_fld_ofs, ptr, ofs);
+  }
+
+  /* Write record fields and their required offsets into the join buffer */ 
+  uint write_record_data(uchar *link, bool *is_full);
+
+  /* 
+    This method must determine for how much the auxiliary buffer should be
+    incremented when a new record is added to the join buffer.
+    If no auxiliary buffer is needed the function should return 0.
+  */
+  virtual uint aux_buffer_incr() { return 0; }
+
+  /* Shall calculate how much space is remaining in the join buffer */ 
+  virtual ulong rem_space() 
+  { 
+    return max(buff_size-(end_pos-buff)-aux_buff_size,0);
+  }
+
+  /* Shall skip record from the join buffer if its match flag is on */
+  virtual bool skip_record_if_match();
+
+  /*  Read all flag and data fields of a record from the join buffer */
+  uint read_all_record_fields();
+  
+  /* Read all flag fields of a record from the join buffer */
+  uint read_flag_fields();
+
+  /* Read a data record field from the join buffer */
+  uint read_record_field(CACHE_FIELD *copy, bool last_record);
+
+  /* Read a referenced field from the join buffer */
+  bool read_referenced_field(CACHE_FIELD *copy, uchar *rec_ptr, uint *len);
+
+  /* 
+    True if rec_ptr points to the record whose blob data stay in
+    record buffers
+  */
+  bool blob_data_is_in_rec_buff(uchar *rec_ptr)
+  {
+    return rec_ptr == last_rec_pos && last_rec_blob_data_is_in_rec_buff;
+  }
+
+  /* Find matches from the next table for records from the join buffer */   
+  virtual enum_nested_loop_state join_matching_records(bool skip_last)=0;
+
+  /* Add null complements for unmatched outer records from buffer */
+  virtual enum_nested_loop_state join_null_complements(bool skip_last);
+
+  /* Restore the fields of the last record from the join buffer */
+  virtual void restore_last_record();
+
+  /*Set match flag for a record in join buffer if it has not been set yet */
+  bool set_match_flag_if_none(JOIN_TAB *first_inner, uchar *rec_ptr);
+
+  enum_nested_loop_state generate_full_extensions(uchar *rec_ptr);
+
+  /* Check matching to a partial join record from the join buffer */
+  bool check_match(uchar *rec_ptr);
+
+public:
+
+  /* Table to be joined with the partial join records from the cache */ 
+  JOIN_TAB *join_tab;
+
+  /* Pointer to the previous join cache if there is any */
+  JOIN_CACHE *prev_cache;
+  /* Pointer to the next join cache if there is any */
+  JOIN_CACHE *next_cache;
+
+  /* Shall initialize the join cache structure */ 
+  virtual int init()=0;  
+
+  /* The function shall return TRUE only for BKA caches */
+  virtual bool is_key_access() { return FALSE; }
+
+  /* Shall reset the join buffer for reading/writing */
+  virtual void reset(bool for_writing);
+
+  /* 
+    This function shall add a record into the join buffer and return TRUE
+    if it has been decided that it should be the last record in the buffer.
+  */ 
+  virtual bool put_record();
+
+  /* 
+    This function shall read the next record into the join buffer and return
+    TRUE if there is no more next records.
+  */ 
+  virtual bool get_record();
+
+  /* 
+    This function shall read the record at the position rec_ptr
+    in the join buffer
+  */ 
+  virtual void get_record_by_pos(uchar *rec_ptr);
+
+  /* Shall return the value of the match flag for the positioned record */
+  virtual bool get_match_flag_by_pos(uchar *rec_ptr);
+
+  /* Shall return the position of the current record */
+  virtual uchar *get_curr_rec() { return curr_rec_pos; }
+
+  /* Shall set the current record link */
+  virtual void set_curr_rec_link(uchar *link) { curr_rec_link= link; }
+
+  /* Shall return the current record link */
+  virtual uchar *get_curr_rec_link()
+  { 
+    return (curr_rec_link ? curr_rec_link : get_curr_rec());
+  }
+     
+  /* Join records from the join buffer with records from the next join table */    
+  enum_nested_loop_state join_records(bool skip_last);
+
+  virtual ~JOIN_CACHE() {}
+  void reset_join(JOIN *j) { join= j; }
+  void free()
+  { 
+    x_free(buff);
+    buff= 0;
+  }   
+  
+  friend class JOIN_CACHE_BNL;
+  friend class JOIN_CACHE_BKA;
+  friend class JOIN_CACHE_BKA_UNIQUE;
+};
+
+
+class JOIN_CACHE_BNL :public JOIN_CACHE
+{
+
+protected:
+
+  /* Using BNL find matches from the next table for records from join buffer */
+  enum_nested_loop_state join_matching_records(bool skip_last);
+
+public:
+
+  /* 
+    This constructor creates an unlinked BNL join cache. The cache is to be
+    used to join table 'tab' to the result of joining the previous tables 
+    specified by the 'j' parameter.
+  */   
+  JOIN_CACHE_BNL(JOIN *j, JOIN_TAB *tab)
+  { 
+    join= j;
+    join_tab= tab;
+    prev_cache= next_cache= 0;
+  }
+
+  /* 
+    This constructor creates a linked BNL join cache. The cache is to be 
+    used to join table 'tab' to the result of joining the previous tables 
+    specified by the 'j' parameter. The parameter 'prev' specifies the previous
+    cache object to which this cache is linked.
+  */   
+  JOIN_CACHE_BNL(JOIN *j, JOIN_TAB *tab, JOIN_CACHE *prev)
+  { 
+    join= j;
+    join_tab= tab;
+    prev_cache= prev;
+    next_cache= 0;
+    if (prev)
+      prev->next_cache= this;
+  }
+
+  /* Initialize the BNL cache */       
+  int init();
+
+};
+
+class JOIN_CACHE_BKA :public JOIN_CACHE
+{
+protected:
+
+  /* Flag to to be passed to the MRR interface */ 
+  uint mrr_mode;
+
+  /* MRR buffer assotiated with this join cache */
+  HANDLER_BUFFER mrr_buff;
+
+  /* Shall initialize the MRR buffer */
+  virtual void init_mrr_buff()
+  {
+    mrr_buff.buffer= end_pos;
+    mrr_buff.buffer_end= buff+buff_size;
+  }
+
+  /*
+    The number of the cache fields that are used in building keys to access
+    the table join_tab
+  */
+  uint local_key_arg_fields;
+  /* 
+    The total number of the fields in the previous caches that are used
+    in building keys t access the table join_tab
+  */
+  uint external_key_arg_fields;
+
+  /* 
+    This flag indicates that the key values will be read directly from the join
+    buffer. It will save us building key values in the key buffer.
+  */
+  bool use_emb_key;
+  /* The length of an embedded key value */ 
+  uint emb_key_length;
+
+  /* Check the possibility to read the access keys directly from join buffer */  
+  bool check_emb_key_usage();
+
+  /* Calculate the increment of the MM buffer for a record write */
+  uint aux_buffer_incr();
+
+  /* Using BKA find matches from the next table for records from join buffer */
+  enum_nested_loop_state join_matching_records(bool skip_last);
+
+  /* Prepare to search for records that match records from the join buffer */
+  enum_nested_loop_state init_join_matching_records(RANGE_SEQ_IF *seq_funcs,
+                                                    uint ranges);
+
+  /* Finish searching for records that match records from the join buffer */
+  enum_nested_loop_state end_join_matching_records(enum_nested_loop_state rc);
+
+public:
+  
+  /* 
+    This constructor creates an unlinked BKA join cache. The cache is to be
+    used to join table 'tab' to the result of joining the previous tables 
+    specified by the 'j' parameter.
+    The MRR mode initially is set to 'flags'.
+  */   
+  JOIN_CACHE_BKA(JOIN *j, JOIN_TAB *tab, uint flags)
+  { 
+    join= j;
+    join_tab= tab;
+    prev_cache= next_cache= 0;
+    mrr_mode= flags;
+  }
+
+  /* 
+    This constructor creates a linked BKA join cache. The cache is to be 
+    used to join table 'tab' to the result of joining the previous tables 
+    specified by the 'j' parameter. The parameter 'prev' specifies the cache
+    object to which this cache is linked.
+    The MRR mode initially is set to 'flags'.
+  */   
+  JOIN_CACHE_BKA(JOIN *j, JOIN_TAB *tab, uint flags,  JOIN_CACHE* prev)
+  { 
+    join= j;
+    join_tab= tab;
+    prev_cache= prev;
+    next_cache= 0;
+    if (prev)
+      prev->next_cache= this;
+    mrr_mode= flags;
+  }
+
+  /* Initialize the BKA cache */       
+  int init();
+
+  bool is_key_access() { return TRUE; }
+
+  /* Shall get the key built over the next record from the join buffer */
+  virtual uint get_next_key(uchar **key);
+
+  /* Check if the record combination matches the index condition */
+  bool skip_index_tuple(range_seq_t rseq, char *range_info);
+};
+
+/*
+  The class JOIN_CACHE_BKA_UNIQUE supports the variant of the BKA join algorithm
+  that submits only distinct keys to the MRR interface. The records in the join
+  buffer of a cache of this class that have the same access key are linked into
+  a chain attached to a key entry structure that either itself contains the key
+  value, or, in the case when the keys are embedded, refers to its occurance in
+  one of the records from the chain.
+  To build the chains with the same keys a hash table is employed. It is placed
+  at the very end of the join buffer. The array of hash entries is allocated
+  first at the very bottom of the join buffer, then go key entries. A hash entry
+  contains a header of the list of the key entries with the same hash value. 
+  Each key entry is a structure of the following type:
+    struct st_join_cache_key_entry {
+      union { 
+        uchar[] value;
+        cache_ref *value_ref; // offset from the beginning of the buffer
+      } hash_table_key;
+      key_ref next_key; // offset backward from the beginning of hash table
+      cache_ref *last_rec // offset from the beginning of the buffer
+    }
+  The references linking the records in a chain are always placed at the very
+  beginning of the record info stored in the join buffer. The records are 
+  linked in a circular list. A new record is always added to the end of this 
+  list. When a key is passed to the MRR interface it can be passed either with
+  an association link containing a reference to the header of the record chain
+  attached to the corresponding key entry in the hash table, or without any
+  association link. When the next record is returned by a call to the MRR 
+  function multi_range_read_next without any association (because if was not
+  passed  together with the key) then the key value is extracted from the
+  returned record and searched for it in the hash table. If there is any records
+  with such key the chain of them will be yielded as the result of this search.
+
+  The following picture represents a typical layout for the info stored in the
+  join buffer of a join cache object of the JOIN_CACHE_BKA_UNIQUE class.
+    
+  buff
+  V
+  +----------------------------------------------------------------------------+
+  |     |[*]record_1_1|                                                        |
+  |     ^ |                                                                    |
+  |     | +--------------------------------------------------+                 |
+  |     |                           |[*]record_2_1|          |                 |
+  |     |                           ^ |                      V                 |
+  |     |                           | +------------------+   |[*]record_1_2|   |
+  |     |                           +--------------------+-+   |               |
+  |+--+ +---------------------+                          | |   +-------------+ |
+  ||  |                       |                          V |                 | |
+  |||[*]record_3_1|         |[*]record_1_3|              |[*]record_2_2|     | |
+  ||^                       ^                            ^                   | |
+  ||+----------+            |                            |                   | |
+  ||^          |            |<---------------------------+-------------------+ |
+  |++          | | ... mrr  |   buffer ...           ... |     |               |
+  |            |            |                            |                     |
+  |      +-----+--------+   |                      +-----|-------+             |
+  |      V     |        |   |                      V     |       |             |
+  ||key_3|[/]|[*]|      |   |                |key_2|[/]|[*]|     |             |
+  |                   +-+---|-----------------------+            |             |
+  |                   V |   |                       |            |             |
+  |             |key_1|[*]|[*]|         |   | ... |[*]|   ...  |[*]|  ...  |   |
+  +----------------------------------------------------------------------------+
+                                        ^           ^            ^
+                                        |           i-th entry   j-th entry
+                                        hash table
+
+  i-th hash entry:
+    circular record chain for key_1:
+      record_1_1
+      record_1_2
+      record_1_3 (points to record_1_1)
+    circular record chain for key_3:
+      record_3_1 (points to itself)
+
+  j-th hash entry:
+    circular record chain for key_2:
+      record_2_1
+      record_2_2 (points to record_2_1)
+
+*/
+
+class JOIN_CACHE_BKA_UNIQUE :public JOIN_CACHE_BKA
+{
+
+private:
+
+  /* Size of the offset of a key entry in the hash table */
+  uint size_of_key_ofs;
+
+  /* 
+    Length of a key value.
+    It is assumed that all key values have the same length.
+  */
+  uint key_length;
+  /* 
+    Length of the key entry in the hash table.
+    A key entry either contains the key value, or it contains a reference
+    to the key value if use_emb_key flag is set for the cache.
+  */ 
+  uint key_entry_length;
+ 
+  /* The beginning of the hash table in the join buffer */
+  uchar *hash_table;
+  /* Number of hash entries in the hash table */
+  uint hash_entries;
+
+  /* Number of key entries in the hash table (number of distinct keys) */
+  uint key_entries;
+
+  /* The position of the last key entry in the hash table */
+  uchar *last_key_entry;
+
+  /* The position of the currently retrieved key entry in the hash table */
+  uchar *curr_key_entry;
+
+  /* 
+    The offset of the record fields from the beginning of the record
+    representation. The record representation starts with a reference to
+    the next record in the key record chain followed by the length of
+    the trailing record data followed by a reference to the record segment
+     in the previous cache, if any, followed by the record fields.
+  */ 
+  uint rec_fields_offset;
+  /* The offset of the data fields from the beginning of the record fields */
+  uint data_fields_offset;
+  
+  uint get_hash_idx(uchar* key, uint key_len);
+
+  void cleanup_hash_table();
+  
+protected:
+
+  uint get_size_of_key_offset() { return size_of_key_ofs; }
+
+  /* 
+    Get the position of the next_key_ptr field pointed to by 
+    a linking reference stored at the position key_ref_ptr. 
+    This reference is actually the offset backward from the
+    beginning of hash table.
+  */  
+  uchar *get_next_key_ref(uchar *key_ref_ptr)
+  {
+    return hash_table-get_offset(size_of_key_ofs, key_ref_ptr);
+  }
+
+  /* 
+    Store the linking reference to the next_key_ptr field at 
+    the position key_ref_ptr. The position of the next_key_ptr
+    field is pointed to by ref. The stored reference is actually
+    the offset backward from the beginning of the hash table.
+  */  
+  void store_next_key_ref(uchar *key_ref_ptr, uchar *ref)
+  {
+    store_offset(size_of_key_ofs, key_ref_ptr, (ulong) (hash_table-ref));
+  }     
+  
+  /* 
+    Check whether the reference to the next_key_ptr field at the position
+    key_ref_ptr contains  a nil value.
+  */
+  bool is_null_key_ref(uchar *key_ref_ptr)
+  {
+    ulong nil= 0;
+    return memcmp(key_ref_ptr, &nil, size_of_key_ofs ) == 0;
+  } 
+
+  /* 
+    Set the reference to the next_key_ptr field at the position
+    key_ref_ptr equal to nil.
+  */
+  void store_null_key_ref(uchar *key_ref_ptr)
+  {
+    ulong nil= 0;
+    store_offset(size_of_key_ofs, key_ref_ptr, nil);
+  } 
+
+  uchar *get_next_rec_ref(uchar *ref_ptr)
+  {
+    return buff+get_offset(get_size_of_rec_offset(), ref_ptr);
+  }
+
+  void store_next_rec_ref(uchar *ref_ptr, uchar *ref)
+  {
+    store_offset(get_size_of_rec_offset(), ref_ptr, (ulong) (ref-buff));
+  }     
+ 
+  /*
+    Get the position of the embedded key value for the current
+    record pointed to by get_curr_rec().
+  */ 
+  uchar *get_curr_emb_key()
+  {
+    return get_curr_rec()+data_fields_offset;
+  }
+
+  /*
+    Get the position of the embedded key value pointed to by a reference
+    stored at ref_ptr. The stored reference is actually the offset from
+    the beginning of the join buffer.
+  */  
+  uchar *get_emb_key(uchar *ref_ptr)
+  {
+    return buff+get_offset(get_size_of_rec_offset(), ref_ptr);
+  }
+
+  /* 
+    Store the reference to an embedded key at the position key_ref_ptr.
+    The position of the embedded key is pointed to by ref. The stored
+    reference is actually the offset from the beginning of the join buffer.
+  */  
+  void store_emb_key_ref(uchar *ref_ptr, uchar *ref)
+  {
+    store_offset(get_size_of_rec_offset(), ref_ptr, (ulong) (ref-buff));
+  }
+  
+  /* 
+    Calculate how much space in the buffer would not be occupied by
+    records, key entries and additional memory for the MMR buffer.
+  */ 
+  ulong rem_space() 
+  { 
+    return max(last_key_entry-end_pos-aux_buff_size,0);
+  }
+
+  /* 
+    Initialize the MRR buffer allocating some space within the join buffer.
+    The entire space between the last record put into the join buffer and the
+    last key entry added to the hash table is used for the MRR buffer.
+  */
+  void init_mrr_buff()
+  {
+    mrr_buff.buffer= end_pos;
+    mrr_buff.buffer_end= last_key_entry;
+  }
+
+  /* Skip record from JOIN_CACHE_BKA_UNIQUE buffer if its match flag is on */
+  bool skip_record_if_match();
+
+  /* Using BKA_UNIQUE find matches for records from join buffer */
+  enum_nested_loop_state join_matching_records(bool skip_last);
+
+  /* Search for a key in the hash table of the join buffer */
+  bool key_search(uchar *key, uint key_len, uchar **key_ref_ptr);
+
+public:
+
+  /* 
+    This constructor creates an unlinked BKA_UNIQUE join cache. The cache is
+    to be used to join table 'tab' to the result of joining the previous tables 
+    specified by the 'j' parameter.
+    The MRR mode initially is set to 'flags'.
+  */   
+  JOIN_CACHE_BKA_UNIQUE(JOIN *j, JOIN_TAB *tab, uint flags)
+    :JOIN_CACHE_BKA(j, tab, flags) {}
+
+  /* 
+    This constructor creates a linked BKA_UNIQUE join cache. The cache is
+    to be used to join table 'tab' to the result of joining the previous tables 
+    specified by the 'j' parameter. The parameter 'prev' specifies the cache
+    object to which this cache is linked.
+    The MRR mode initially is set to 'flags'.
+  */   
+  JOIN_CACHE_BKA_UNIQUE(JOIN *j, JOIN_TAB *tab, uint flags,  JOIN_CACHE* prev)
+    :JOIN_CACHE_BKA(j, tab, flags, prev) {}
+
+  /* Initialize the BKA_UNIQUE cache */       
+  int init();
+
+  /* Reset the JOIN_CACHE_BKA_UNIQUE  buffer for reading/writing */
+  void reset(bool for_writing);
+
+  /* Add a record into the JOIN_CACHE_BKA_UNIQUE buffer */
+  bool put_record();
+
+  /* Read the next record from the JOIN_CACHE_BKA_UNIQUE buffer */
+  bool get_record();
+
+  /*
+    Shall check whether all records in a key chain have 
+    their match flags set on
+  */   
+  virtual bool check_all_match_flags_for_key(uchar *key_chain_ptr);
+
+  uint get_next_key(uchar **key); 
+  
+  /* Get the head of the record chain attached to the current key entry */ 
+  uchar *get_curr_key_chain()
+  {
+    return get_next_rec_ref(curr_key_entry+key_entry_length-
+                            get_size_of_rec_offset());
+  }
+  
+  /* Check if the record combination matches the index condition */
+  bool skip_index_tuple(range_seq_t rseq, char *range_info);
+};
+
+
 enum_nested_loop_state sub_select_cache(JOIN *join, JOIN_TAB *join_tab, bool
                                         end_of_records);
 enum_nested_loop_state sub_select(JOIN *join,JOIN_TAB *join_tab, bool
@@ -306,7 +1195,8 @@ public:
   TABLE    **table,**all_tables,*sort_by_table;
   uint	   tables,const_tables;
   uint	   send_group_parts;
-  bool	   sort_and_group,first_record,full_join,group, no_field_update;
+  bool     sort_and_group,first_record,full_join, no_field_update;
+  bool	   group;          /**< If query contains GROUP BY clause */
   bool	   do_send_rows;
   /**
     TRUE when we want to resume nested loop iterations when
@@ -571,6 +1461,16 @@ public:
   {
     return (table_map(1) << tables) - 1;
   }
+  /* 
+    Return the table for which an index scan can be used to satisfy 
+    the sort order needed by the ORDER BY/(implicit) GROUP BY clause 
+  */
+  JOIN_TAB *get_sort_by_join_tab()
+  {
+    return (need_tmp || !sort_by_table || skip_sort_order ||
+            ((group || tmp_table_param.sum_func_count) && !group_list)) ?
+              NULL : join_tab+const_tables;
+  }
 private:
   bool make_simple_join(JOIN *join, TABLE *tmp_table);
 };
@@ -771,6 +1671,8 @@ bool error_if_full_join(JOIN *join);
 int report_error(TABLE *table, int error);
 int safe_index_read(JOIN_TAB *tab);
 COND *remove_eq_conds(THD *thd, COND *cond, Item::cond_result *cond_value);
+void calc_used_field_length(THD *thd, JOIN_TAB *join_tab);
+int join_init_read_record(JOIN_TAB *tab);
 void set_position(JOIN *join,uint idx,JOIN_TAB *table,KEYUSE *key);
 
 inline bool optimizer_flag(THD *thd, uint flag)

=== modified file 'storage/myisam/ha_myisam.cc'
--- a/storage/myisam/ha_myisam.cc	2009-12-15 07:16:46 +0000
+++ b/storage/myisam/ha_myisam.cc	2009-12-21 02:26:15 +0000
@@ -1865,6 +1865,16 @@ int ha_myisam::info(uint flag)
     stats.max_data_file_length=  misam_info.max_data_file_length;
     stats.max_index_file_length= misam_info.max_index_file_length;
     stats.create_time= (ulong) misam_info.create_time;
+    /* 
+      We want the value of stats.mrr_length_per_rec to be platform independent.
+      The size of the chunk at the end of the join buffer used for MRR needs
+      is calculated now basing on the values passed in the stats structure.
+      The remaining part of the join buffer is used for records. A different
+      number of records in the buffer results in a different number of buffer
+      refills and in a different order of records in the result set.
+    */
+    stats.mrr_length_per_rec= misam_info.reflength + 8; // 8=max(sizeof(void *))
+
     ref_length= misam_info.reflength;
     share->db_options_in_use= misam_info.options;
     stats.block_size= myisam_block_size;        /* record block size */