Hi Sanja,
On Wed, Jun 22, 2016 at 02:17:06PM +0200, Oleksandr Byelkin wrote:
revision-id: 475cab835fb48c91d5cca649ab93917ec1718d75 (mariadb-5.5.50-6-g475cab8)
parent(s): a482e76e65a4fee70479e877929381c86b1ec62f
committer: Oleksandr Byelkin
timestamp: 2016-06-22 14:17:06 +0200
message:
MDEV-10050: Crash in subselect
thd should not be taken earlier then fix_field and reset on fix_fields if it is needed.
---
sql/item_subselect.cc | 15 ++++++++++++---
1 file changed, 12 insertions(+), 3 deletions(-)
diff --git a/sql/item_subselect.cc b/sql/item_subselect.cc
index ba67474..60cdd3f 100644
--- a/sql/item_subselect.cc
+++ b/sql/item_subselect.cc
@@ -79,7 +79,9 @@ void Item_subselect::init(st_select_lex *select_lex,
DBUG_PRINT("enter", ("select_lex: 0x%lx this: 0x%lx",
(ulong) select_lex, (ulong) this));
unit= select_lex->master_unit();
- thd= unit->thd;
+#ifndef DBUG_OFF
+ thd= 0;
+#endif
So I've applied the patch, and I'm debugging this statement:
prepare s from 'select a, (select max(one_k.a) from one_k where one_k.a <ten.a) from ten';
(this is just the first subquery I tried, nothing special about it).
We arrive at the above #ifndef, and I have thd=0xa5a5a5a5a5, that is, it's
uninitialized data.
I let it execute further...
