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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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sql/sql_base.cc
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@ -6440,6 +6440,7 @@ set_new_item_local_context(THD *thd, Item_ident *item, TABLE_LIST *table_ref)
if (!(context= new (thd->mem_root) Name_resolution_context))
return TRUE;
context->init();
context->select_lex= table_ref->select_lex;
context->first_name_resolution_table=
context->last_name_resolution_table= table_ref;
item->context= context;