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MDEV-24454 Crash at change_item_tree

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Use in_sum_func (and so nest_level) only in LEX to which SELECT lex belong to

Reduce usage of current_select (because it does not always point on the correct
 SELECT_LEX, for example with prepare.

Change context for all classes inherited from Item_ident (was only for Item_field) in case of pushing down it to HAVING.

Now name resolution context have to have SELECT_LEX reference if the context is present.

Fixed feedback plugin stack usage.
This commit is contained in:
Oleksandr Byelkin
2021-07-23 11:14:13 +02:00
parent 1a62c87897
commit 3690c549c6
11 changed files with 202 additions and 44 deletions
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2
sql/sql_prepare.cc
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@ -3060,6 +3060,7 @@ void reinit_stmt_before_use(THD *thd, LEX *lex)
}
for (; sl; sl= sl->next_select_in_list())
{
sl->parent_lex->in_sum_func= NULL;
if (sl->changed_elements & TOUCHED_SEL_COND)
{
/* remove option which was put by mysql_explain_union() */
@ -3190,7 +3191,6 @@ void reinit_stmt_before_use(THD *thd, LEX *lex)
lex->result->set_thd(thd);
}
lex->allow_sum_func= 0;
lex->in_sum_func= NULL;
DBUG_VOID_RETURN;
}