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MDEV-23449: alias do not exist and a query do not report an error

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For an IN/ANY/ALL subquery without an aggregate function and HAVING clause,
the GROUP BY clause is removed.
Due to the GROUP BY list being removed, the invalid reference in the GROUP BY
clause was never resolved.
Remove the GROUP BY list only when the all the items in the GROUP BY list
are resolved.
Also removing the GROUP BY list later would not affect the extension that allows
using non-aggregated field in an aggregate function (when ONLY_FULL_GROUP_BY
is not set) because the GROUP BY list is removed only when their is
NO aggregate function in IN/ALL/ANY subquery.
This commit is contained in:
Varun Gupta
2021-01-31 19:55:07 +05:30
parent 072b39da66
commit 26f5033555
3 changed files with 36 additions and 16 deletions
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33
sql/sql_select.cc
View File

@ -729,22 +729,6 @@ JOIN::prepare(TABLE_LIST *tables_init,
tables_list, select_lex->leaf_tables,
FALSE, SELECT_ACL, SELECT_ACL, FALSE))
DBUG_RETURN(-1);
/*
Permanently remove redundant parts from the query if
1) This is a subquery
2) This is the first time this query is optimized (since the
transformation is permanent
3) Not normalizing a view. Removal should take place when a
query involving a view is optimized, not when the view
is created
*/
if (select_lex->master_unit()->item && // 1)
select_lex->first_cond_optimization && // 2)
!thd->lex->is_view_context_analysis()) // 3)
{
remove_redundant_subquery_clauses(select_lex);
}
/*
TRUE if the SELECT list mixes elements with and without grouping,
@ -824,6 +808,23 @@ JOIN::prepare(TABLE_LIST *tables_init,
&hidden_group_fields,
&select_lex->select_n_reserved))
DBUG_RETURN(-1);
/*
Permanently remove redundant parts from the query if
1) This is a subquery
2) This is the first time this query is optimized (since the
transformation is permanent
3) Not normalizing a view. Removal should take place when a
query involving a view is optimized, not when the view
is created
*/
if (select_lex->master_unit()->item && // 1)
select_lex->first_cond_optimization && // 2)
!thd->lex->is_view_context_analysis()) // 3)
{
remove_redundant_subquery_clauses(select_lex);
}
/* Resolve the ORDER BY that was skipped, then remove it. */
if (skip_order_by && select_lex !=
select_lex->master_unit()->global_parameters())