Details
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Bug
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Status: Closed (View Workflow)
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Major
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Resolution: Not a Bug
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5.5, 10.0, 10.1, 10.2
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None
Description
CREATE TABLE t1 ( pk int NOT NULL PRIMARY KEY, ci1 int, ci2 int, v1 varchar(1), v2 varchar(1)); |
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INSERT INTO t1 VALUES (1,2,4,'v','v'), (2,150,62,'v','v'), (3,NULL,7,'c','c'), (4,2,1,NULL,NULL); |
INSERT INTO t1 VALUES (5,5,0,'x','x'), (6,3,7,'i','i'), (7,1,7,'e','e'), (8,4,1,'p','p'); |
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CREATE TABLE t2 (pk int NOT NULL PRIMARY KEY, ci1 int, ci2 int, v1 varchar(1), v2 varchar(1), |
KEY ci2 (ci2)); |
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INSERT INTO t2 VALUES (10,NULL,8,'x','x'), (11,8,7,'d','d'), (12,1,1,'r','r'), (13,9,7,'f','f'); |
INSERT INTO t2 VALUES (14,4,9,'y','y'), (15,3,NULL,'u','u'), (16,2,1,'m','m'), (17,NULL,9,NULL,NULL); |
INSERT INTO t2 VALUES (18,2,2,'o','o'), (19,NULL,9,'w','w'), (20,6,2,'m','m'), (21,7,4,'q','q'); |
INSERT INTO t2 VALUES (22,2,0,NULL,NULL), (23,5,4,'d','d'), (24,7,8,'g','g'), (25,6,NULL,'x','x'); |
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CREATE TABLE t3 (pk int NOT NULL PRIMARY KEY, ci1 int, ci2 int, v1 varchar(1), v2 varchar(1)); |
INSERT INTO t3 VALUES (1,8,4,'c','c'), (2,3,5,'c','c'), (3,3,8,'q','q'), (4,NULL,4,'g','g'); |
INSERT INTO t3 VALUES (5,7,8,'e','e'), (6,4,2,'l','l'), (7,7,9,NULL,NULL), (8,7,6,'v','v'); |
INSERT INTO t3 VALUES (9,8,NULL,'c','c'), (10,6,NULL,'u','u'), (11,3,48,'x','x'), (12,210,228,'x','x'); |
INSERT INTO t3 VALUES (13,1,3,'x','x'), (14,2,5,'l','l'), (15,251,39,'e','e'), (16,4,6,'s','s'); |
INSERT INTO t3 VALUES (17,4,8,'k','k'), (18,9,3,'m','m'), (19,4,NULL,'x','x'), (20,NULL,2,'s','s'); |
INSERT INTO t3 VALUES (21,4,6,'h','h'), (22,NULL,3,'u','u'), (23,1,1,'x','x'), (24,6,4,'l','l'); |
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SELECT a2.ci2 FROM (t1, (SELECT t3.* FROM ( t3 JOIN t2 ON (t2.v2 = t3.v1 )))AS a2 ) |
WHERE (( a2.ci2, t1.ci2 ) IN |
( SELECT t2.ci2, MAX(t2.ci1) FROM ( t2 JOIN t3 ON (t3.pk = t2.ci2 )) WHERE ( t3.v2 <> 'w' OR t3.pk < 6 ))) ; |
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SET SESSION optimizer_switch='materialization=off,in_to_exists=on'; |
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SELECT a2.ci2 FROM (t1, (SELECT t3.* FROM ( t3 JOIN t2 ON (t2.v2 = t3.v1 )))AS a2 ) |
WHERE (( a2.ci2, t1.ci2 ) IN |
( SELECT t2.ci2, MAX(t2.ci1) FROM ( t2 JOIN t3 ON (t3.pk = t2.ci2 )) WHERE ( t3.v2 <> 'w' OR t3.pk < 6 ))) ; |
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DROP TABLE t1,t2,t3; |
MariaDB [test]> SELECT a2.ci2 FROM (t1, (SELECT t3.* FROM ( t3 JOIN t2 ON (t2.v2 = t3.v1 )))AS a2 )
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-> WHERE (( a2.ci2, t1.ci2 ) IN
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-> ( SELECT t2.ci2, MAX(t2.ci1) FROM ( t2 JOIN t3 ON (t3.pk = t2.ci2 )) WHERE ( t3.v2 <> 'w' OR t3.pk < 6 ))) ;
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+------+
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| ci2 |
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+------+
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| 8 |
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| 8 |
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| 8 |
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+------+
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3 rows in set (0.01 sec)
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MariaDB [test]> explain extended
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-> SELECT a2.ci2 FROM (t1, (SELECT t3.* FROM ( t3 JOIN t2 ON (t2.v2 = t3.v1 )))AS a2 )
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-> WHERE (( a2.ci2, t1.ci2 ) IN
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-> ( SELECT t2.ci2, MAX(t2.ci1) FROM ( t2 JOIN t3 ON (t3.pk = t2.ci2 )) WHERE ( t3.v2 <> 'w' OR t3.pk < 6 ))) ;
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+------+--------------+-------------+--------+---------------+---------+---------+-------------+------+----------+--------------------------------------------------------+
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| id | select_type | table | type | possible_keys | key | key_len | ref | rows | filtered | Extra |
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+------+--------------+-------------+--------+---------------+---------+---------+-------------+------+----------+--------------------------------------------------------+
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| 1 | PRIMARY | <subquery3> | ALL | distinct_key | NULL | NULL | NULL | 1 | 100.00 | |
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| 1 | PRIMARY | t1 | ALL | NULL | NULL | NULL | NULL | 8 | 100.00 | Using where; Using join buffer (flat, BNL join) |
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| 1 | PRIMARY | t2 | ALL | NULL | NULL | NULL | NULL | 16 | 100.00 | Using join buffer (incremental, BNL join) |
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| 1 | PRIMARY | t3 | ALL | NULL | NULL | NULL | NULL | 24 | 100.00 | Using where; Using join buffer (incremental, BNL join) |
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| 3 | MATERIALIZED | t2 | ALL | ci2 | NULL | NULL | NULL | 16 | 100.00 | Using where |
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| 3 | MATERIALIZED | t3 | eq_ref | PRIMARY | PRIMARY | 4 | test.t2.ci2 | 1 | 100.00 | Using where |
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+------+--------------+-------------+--------+---------------+---------+---------+-------------+------+----------+--------------------------------------------------------+
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MariaDB [test]> SET SESSION optimizer_switch='materialization=off,in_to_exists=on';
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Query OK, 0 rows affected (0.00 sec)
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MariaDB [test]> SELECT a2.ci2 FROM (t1, (SELECT t3.* FROM ( t3 JOIN t2 ON (t2.v2 = t3.v1 )))AS a2 )
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-> WHERE (( a2.ci2, t1.ci2 ) IN
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-> ( SELECT t2.ci2, MAX(t2.ci1) FROM ( t2 JOIN t3 ON (t3.pk = t2.ci2 )) WHERE ( t3.v2 <> 'w' OR t3.pk < 6 ))) ;
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+------+
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| ci2 |
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+------+
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| 1 |
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| 1 |
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| 1 |
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| 1 |
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| 1 |
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| 1 |
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+------+
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6 rows in set (0.01 sec)
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MariaDB [test]> explain extended
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-> SELECT a2.ci2 FROM (t1, (SELECT t3.* FROM ( t3 JOIN t2 ON (t2.v2 = t3.v1 )))AS a2 )
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-> WHERE (( a2.ci2, t1.ci2 ) IN
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-> ( SELECT t2.ci2, MAX(t2.ci1) FROM ( t2 JOIN t3 ON (t3.pk = t2.ci2 )) WHERE ( t3.v2 <> 'w' OR t3.pk < 6 ))) ;
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+------+--------------------+-------+--------+---------------+---------+---------+-------------+------+----------+--------------------------------------------------------+
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| id | select_type | table | type | possible_keys | key | key_len | ref | rows | filtered | Extra |
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+------+--------------------+-------+--------+---------------+---------+---------+-------------+------+----------+--------------------------------------------------------+
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| 1 | PRIMARY | t1 | ALL | NULL | NULL | NULL | NULL | 8 | 100.00 | |
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| 1 | PRIMARY | t2 | ALL | NULL | NULL | NULL | NULL | 16 | 100.00 | Using join buffer (flat, BNL join) |
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| 1 | PRIMARY | t3 | ALL | NULL | NULL | NULL | NULL | 24 | 100.00 | Using where; Using join buffer (incremental, BNL join) |
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| 3 | DEPENDENT SUBQUERY | t2 | range | ci2 | ci2 | 5 | NULL | 14 | 100.00 | Using index condition |
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| 3 | DEPENDENT SUBQUERY | t3 | eq_ref | PRIMARY | PRIMARY | 4 | test.t2.ci2 | 1 | 100.00 | Using where |
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+------+--------------------+-------+--------+---------------+---------+---------+-------------+------+----------+--------------------------------------------------------+
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