database/mariadb
1
0
Fork 0
mirror of https://github.com/MariaDB/server.git synced 2025-08-01 03:47:19 +03:00
Code Activity

Merge 10.3 into 10.4

Browse Source
This commit is contained in:
Marko Mäkelä
2021-04-27 08:53:50 +03:00
parent 9e6310e323 29b2f3dbb5
commit 90a306a7ab
14 changed files with 257 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

11
sql/sql_select.cc
View File

@ -660,7 +660,16 @@ void remove_redundant_subquery_clauses(st_select_lex *subq_select_lex)
{
for (ORDER *ord= subq_select_lex->group_list.first; ord; ord= ord->next)
{
(*ord->item)->walk(&Item::eliminate_subselect_processor, FALSE, NULL);
/*
Do not remove the item if it is used in select list and then referred
from GROUP BY clause by its name or number. Example:
select (select ... ) as SUBQ ... group by SUBQ
Here SUBQ cannot be removed.
*/
if (!ord->in_field_list)
(*ord->item)->walk(&Item::eliminate_subselect_processor, FALSE, NULL);
}
subq_select_lex->join->group_list= NULL;
subq_select_lex->group_list.empty();