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MDEV-21603 Crashing SHOW TABLES with derived table in WHERE condition

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When you only need view structure, don't call handle_derived with
DT_CREATE and rely on its internal hackish check to skip DT_CREATE.
Because handle_derived is called from many different places,
and this internal hackish check is indiscriminative.

Instead, just don't ask handle_derived to do DT_CREATE
if you don't want it to do DT_CREATE.
This commit is contained in:
Sergei Golubchik
2021-05-03 23:26:30 +02:00
committed by Oleksandr Byelkin
parent 72fa9dabad
commit a20195bba5
7 changed files with 67 additions and 23 deletions
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sql/sql_base.cc
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@ -4939,7 +4939,6 @@ bool open_normal_and_derived_tables(THD *thd, TABLE_LIST *tables, uint flags,
uint counter;
MDL_savepoint mdl_savepoint= thd->mdl_context.mdl_savepoint();
DBUG_ENTER("open_normal_and_derived_tables");
DBUG_ASSERT(!thd->fill_derived_tables());
if (open_tables(thd, &tables, &counter, flags, &prelocking_strategy) ||
mysql_handle_derived(thd->lex, dt_phases))
goto end;