database/mariadb
1
0
Fork 0
mirror of https://github.com/MariaDB/server.git synced 2025-08-01 03:47:19 +03:00
Code Activity

MDEV-18467 Server crashes in fix_semijoin_strategies_for_picked_join_order

Browse Source 
If a splittable materialized derived table / view T is used in a inner nest
of an outer join with impossible ON condition then T is marked as a
constant table. Yet the execution plan to build T is still searched for
in spite of the fact that is not needed. So it should be set.
This commit is contained in:
Igor Babaev
2019-03-04 23:10:30 -08:00
parent a2fc36989e
commit 8f4de38f65
5 changed files with 81 additions and 6 deletions
Download Patch File Download Diff File Expand all files Collapse all files

29
mysql-test/main/derived_split_innodb.test
View File

@ -94,3 +94,32 @@ eval EXPLAIN $q;
set join_cache_level=default;
DROP TABLE t1,t2;
--echo #
--echo # Bug mdev-18467: join of grouping view and a base table as inner operand
--echo # of left join with on condition containing impossible range
--echo #
create table t1 (f1 int, f2 int, key(f2)) engine=InnoDB;
insert into t1 values (3,33), (7,77), (1,11);
create table t2 (f1 int, f2 int, primary key (f1)) engine=InnoDB;
insert into t2 values (3,33), (9,99), (1,11);
create view v1 as
select f1, max(f2) as f2 from t2 group by f1;
let $q=
select t.f2
from t1
left join
(v1 join t1 as t on v1.f1=t.f1 and t.f2 = null)
on t1.f1=t.f1;
eval $q;
eval explain $q;
eval set statement optimizer_switch='split_materialized=off' for explain $q;
drop view v1;
drop table t1,t2;