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Merge 10.4 into 10.5

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This commit is contained in:
Marko Mäkelä
2021-04-27 09:10:47 +03:00
parent dd07cfcecd 90a306a7ab
commit 559efad44e
19 changed files with 666 additions and 514 deletions
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11
sql/sql_select.cc
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@ -667,7 +667,16 @@ 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();