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[Sergey Petrunia <sergey@xxxxxxxxxxx>]

Hello Igor,

I was trying to move JOIN::process_window_functions() from using
join->fields_list to using join->select_lex->window_funcs.

And I discovered that join->select_lex->window_funcs does not contain
window function items that use window definition.  Is this intentional?

Example:


create table t0 (a int);
insert into t0 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
create table t1 (pk int, c int);
insert into t1 select a+1,1 from t0;
update t1 set c=2 where pk not in (1,2,3,4);

select  pk, c, 
  count(*) over 
  (partition by c order by pk  rows between 2 preceding and 2 following) as CNT
from t1 

Here:

  #1  0x0000555555af5db6 in AGGR_OP::end_send (this=0x7fff4c0086c8)
(gdb) p join->select_lex->window_funcs
  $69 = {<base_list> = {<Sql_alloc> = {<No data fields>}, first = 0x7fff4c005d18, last = 0x7fff4c005d18, elements = 1}, <No data fields>}
 

But:

select  pk, c, 
  count(*) over w1 as CNT 
from t1 
window w1 as (partition by c order by pk  rows between 2 preceding and 2 following);


(gdb) p join->select_lex->window_funcs
  $74 = {<base_list> = {<Sql_alloc> = {<No data fields>}, first = 0x555556d48820, last = 0x55555ab10b70, elements = 0}, <No data fields>}

BR
 Sergei
-- 
Sergei Petrunia, Software Developer
MariaDB Corporation | Skype: sergefp | Blog: http://s.petrunia.net/blog