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MDEV-35249 Fix regression caused by MDEV-34447

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MDEV-34447 Removed setting first_cond_optimization to 0 in update and
delete when leaf_tables_saved. This can cause problems when two ps
executions of an update go through different paths, where the first ps
execution goes through single table update only and the second ps
execution also goes through multi table update. When this happens, the
first_cond_optimization of the outer query is not set to false during
the first ps execution because optimize() is not called for the outer
query. But then the second ps execution will call optimize() on the
outer query, which with first_cond_optimization==true trips the 2nd ps
mem leak detection.

This is not a problem in higher version as both executions go through
multi table updates, possibly due to MDEV-28883.

We fix this problem by restoring the FALSE assignments to
first_cond_optimization.
This commit is contained in:
Yuchen Pei
2024-10-25 18:03:40 +11:00
parent decdd4bf49
commit b8c2bd9f69
4 changed files with 38 additions and 1 deletions
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6
sql/sql_delete.cc
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@ -379,9 +379,10 @@ bool mysql_delete(THD *thd, TABLE_LIST *table_list, COND *conds,
if (returning)
(void) result->prepare(returning->item_list, NULL);
if (thd->lex->current_select->first_cond_optimization)
if (!thd->lex->current_select->leaf_tables_saved)
{
thd->lex->current_select->save_leaf_tables(thd);
thd->lex->current_select->leaf_tables_saved= true;
thd->lex->current_select->first_cond_optimization= 0;
}
/* check ORDER BY even if it can be ignored */
@ -504,6 +505,7 @@ bool mysql_delete(THD *thd, TABLE_LIST *table_list, COND *conds,
{
thd->lex->current_select->save_leaf_tables(thd);
thd->lex->current_select->leaf_tables_saved= true;
thd->lex->current_select->first_cond_optimization= 0;
}
my_ok(thd, 0);
@ -541,6 +543,7 @@ bool mysql_delete(THD *thd, TABLE_LIST *table_list, COND *conds,
{
thd->lex->current_select->save_leaf_tables(thd);
thd->lex->current_select->leaf_tables_saved= true;
thd->lex->current_select->first_cond_optimization= 0;
}
my_ok(thd, 0);
@ -919,6 +922,7 @@ cleanup:
{
thd->lex->current_select->save_leaf_tables(thd);
thd->lex->current_select->leaf_tables_saved= true;
thd->lex->current_select->first_cond_optimization= 0;
}
delete deltempfile;