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MDEV-32064 Crash when searching for the best split of derived table

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This bug could affect queries with IN subqueries in WHERE clause and using
derived tables to which split optimization potentially could be applied.

When looking for the best split of a splittable derived table T any key
access from a semi-join materialized table used for lookups S to table T
must be excluded from consideration because in the current implementation
of such tables as S the values from its records cannot be used to access
other tables.

Approved by Oleksandr Byelkin <sanja@mariadb.com>
This commit is contained in:
Igor Babaev
2023-10-11 22:46:36 -07:00
parent 0ca699bff7
commit b1c8ea83a5
3 changed files with 206 additions and 1 deletions
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3
sql/opt_split.cc
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@@ -987,7 +987,8 @@ SplM_plan_info * JOIN_TAB::choose_best_splitting(uint idx,
table_map needed_in_prefix= 0;
do
{
if (keyuse_ext->needed_in_prefix & remaining_tables)
if (keyuse_ext->needed_in_prefix &
(remaining_tables | this->join->sjm_lookup_tables))
{
keyuse_ext++;
continue;