database/mariadb
1
0
Fork 0
mirror of https://github.com/MariaDB/server.git synced 2025-08-08 11:22:35 +03:00
Code Activity

MDEV-10389: Query returns different results on a debug vs non-debug build

Browse Source 
The problem was caused by a merged semi-join, which contained a non-merged
semi-join, which used references to the top-level query in the left_expr.

When moving non-merged semi-join from the subquery to its parent, do not
forget to call fix_after_pullout for its Item_subselect. We need to do
that specifically, because non-merged semi-joins do not have their
IN-equality in the WHERE clause at this stage.
This commit is contained in:
Sergei Petrunia
2016-07-27 17:01:45 +03:00
parent a52d3aa831
commit a63ceaeab1
4 changed files with 43 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

5
sql/opt_subselect.cc
View File

@@ -1558,7 +1558,12 @@ static bool convert_subq_to_sj(JOIN *parent_join, Item_in_subselect *subq_pred)
{
tl->set_tablenr(table_no);
if (tl->is_jtbm())
{
tl->jtbm_table_no= table_no;
Item *dummy= tl->jtbm_subselect;
tl->jtbm_subselect->fix_after_pullout(parent_lex, &dummy);
DBUG_ASSERT(dummy == tl->jtbm_subselect);
}
SELECT_LEX *old_sl= tl->select_lex;
tl->select_lex= parent_join->select_lex;
for (TABLE_LIST *emb= tl->embedding;