database/mariadb
1
0
Fork 0
mirror of https://github.com/MariaDB/server.git synced 2025-07-29 05:21:33 +03:00
Code Activity

Fixed the bug mdev-12931.

Browse Source 
This corrects the patch for mdev-10006.
The current code supports only those semi-join nests that are placed at
the join top level. So such nests cannot depend on other tables or nests.
This commit is contained in:
Igor Babaev
2017-05-29 00:27:14 -07:00
parent e4d10e09cf
commit af4421e82d
3 changed files with 76 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

39
mysql-test/r/subselect_innodb.result
View File

@ -576,3 +576,42 @@ id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL #
2 DEPENDENT SUBQUERY t2 ref key1 key1 5 test.t1.a # Using where; Using filesort
drop table t1,t2;
#
# mdev-12931: semi-join in ON expression of STRAIGHT_JOIN
# joining a base table and a mergeable derived table
#
CREATE TABLE t1 (f1 int) ENGINE=InnoDB;
INSERT INTO t1 VALUES (3),(2);
CREATE TABLE t2 (f2 int) ENGINE=InnoDB;
INSERT INTO t2 VALUES (1),(4);
CREATE TABLE t3 (f3 int) ENGINE=InnoDB;
INSERT INTO t3 VALUES (5),(6);
CREATE TABLE t4 (f4 int) ENGINE=InnoDB;
INSERT INTO t4 VALUES (1),(8);
SELECT *
FROM t1
INNER JOIN
( t2 STRAIGHT_JOIN ( SELECT * FROM t3 ) AS sq
ON ( 1 IN ( SELECT f4 FROM t4 ) ) )
ON ( f1 >= f2 );
f1 f2 f3
3 1 5
2 1 5
3 1 6
2 1 6
EXPLAIN EXTENDED
SELECT *
FROM t1
INNER JOIN
( t2 STRAIGHT_JOIN ( SELECT * FROM t3 ) AS sq
ON ( 1 IN ( SELECT f4 FROM t4 ) ) )
ON ( f1 >= f2 );
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY <subquery3> eq_ref distinct_key distinct_key 4 func 1 100.00
1 PRIMARY t1 ALL NULL NULL NULL NULL 2 100.00 Using join buffer (flat, BNL join)
1 PRIMARY t2 ALL NULL NULL NULL NULL 2 100.00 Using where; Using join buffer (incremental, BNL join)
1 PRIMARY t3 ALL NULL NULL NULL NULL 2 100.00 Using join buffer (incremental, BNL join)
3 MATERIALIZED t4 ALL NULL NULL NULL NULL 2 100.00 Using where
Warnings:
Note 1003 select `test`.`t1`.`f1` AS `f1`,`test`.`t2`.`f2` AS `f2`,`test`.`t3`.`f3` AS `f3` from `test`.`t1` join `test`.`t2` semi join (`test`.`t4`) join `test`.`t3` where ((`test`.`t4`.`f4` = 1) and (`test`.`t1`.`f1` >= `test`.`t2`.`f2`))
DROP TABLE t1,t2,t3,t4;