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102 lines
3.3 KiB
Text
102 lines
3.3 KiB
Text
#
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# MDEV-16917: do not use splitting for derived with join cache
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#
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CREATE TABLE t1 (
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n1 int(10) NOT NULL,
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n2 int(10) NOT NULL,
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c1 char(1) NOT NULL,
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KEY c1 (c1),
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KEY n1_c1_n2 (n1,c1,n2)
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) ENGINE=InnoDB;
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INSERT INTO t1 VALUES (0, 2, 'a'), (1, 3, 'a');
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ANALYZE TABLE t1;
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Table Op Msg_type Msg_text
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test.t1 analyze status Engine-independent statistics collected
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test.t1 analyze status OK
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EXPLAIN SELECT t1.n1 FROM t1, (SELECT n1, n2 FROM t1 WHERE c1 = 'a' GROUP BY n1) as t
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WHERE t.n1 = t1.n1 AND t.n2 = t1.n2 AND c1 = 'a' GROUP BY n1;
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id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY t1 index c1,n1_c1_n2 n1_c1_n2 9 NULL 2 Using where; Using index
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1 PRIMARY <derived2> ref key0 key0 8 test.t1.n1,test.t1.n2 2
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2 LATERAL DERIVED t1 ref c1,n1_c1_n2 n1_c1_n2 4 test.t1.n1 1 Using where; Using index
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SELECT t1.n1 FROM t1, (SELECT n1, n2 FROM t1 WHERE c1 = 'a' GROUP BY n1) as t
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WHERE t.n1 = t1.n1 AND t.n2 = t1.n2 AND c1 = 'a' GROUP BY n1;
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n1
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0
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1
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DROP TABLE t1;
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#
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# MDEV-17211: splittable materialized derived joining 3 tables with
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# GROUP BY list containing fields from 2 of them
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#
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CREATE TABLE t1 (
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id1 int, i1 int, id2 int,
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PRIMARY KEY (id1), KEY (i1), KEY (id2)
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) ENGINE=InnoDB;
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INSERT INTO t1 VALUES (1,1,1);
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CREATE TABLE t2 (id2 int, i2 int) ENGINE=InnoDB;
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INSERT INTO t2 VALUES (1, 1);
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CREATE TABLE t3 (id3 int, i3 int, PRIMARY KEY (id3)) ENGINE=InnoDB;
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INSERT INTO t3 VALUES (1,1);
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EXPLAIN SELECT id3
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FROM (SELECT t3.id3, t2.i2, t1.id2 FROM t3,t1,t2
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WHERE t3.i3=t1.id1 AND t2.id2=t1.id2
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GROUP BY t3.id3, t1.id2) AS t,
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t2
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WHERE t2.id2=t.id2;
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id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY t2 ALL NULL NULL NULL NULL 1 Using where
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1 PRIMARY <derived2> ref key0 key0 5 test.t2.id2 2
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2 DERIVED t3 ALL NULL NULL NULL NULL 1 Using where; Using temporary; Using filesort
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2 DERIVED t1 eq_ref PRIMARY,id2 PRIMARY 4 test.t3.i3 1
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2 DERIVED t2 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (flat, BNL join)
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SELECT id3
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FROM (SELECT t3.id3, t2.i2, t1.id2 FROM t3,t1,t2
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WHERE t3.i3=t1.id1 AND t2.id2=t1.id2
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GROUP BY t3.id3, t1.id2) AS t,
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t2
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WHERE t2.id2=t.id2;
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id3
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1
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DROP TABLE t1,t2,t3;
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#
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# Bug mdev-17381: equi-join of derived table with join_cache_level=4
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#
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CREATE TABLE t1 (
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id int NOT NULL,
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amount decimal DEFAULT NULL,
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PRIMARY KEY (id)
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) ENGINE=INNODB;
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CREATE TABLE t2 (
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id int NOT NULL,
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name varchar(50) DEFAULT NULL,
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PRIMARY KEY (id)
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) ENGINE=INNODB;
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INSERT INTO t1 VALUES
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(1, 10.0000), (2, 20.0000), (3, 30.0000), (4, 40.0000),
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(5, NULL), (6, NULL), (7, 70.0000), (8, 80.0000);
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INSERT INTO t2 VALUES
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(1,'A'), (2,'B'), (3,'C'), (4,'D'), (5, NULL), (6, NULL),
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(7,'E'), (8,'F'), (9,'G'), (10,'H'), (11, NULL), (12, NULL);
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set join_cache_level=4;
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SELECT t2.id,t2.name,t.total_amt
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FROM t2
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LEFT JOIN
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(SELECT id, sum(amount) total_amt FROM t1 GROUP BY id) AS t
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ON t2.id=t.id
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WHERE t2.id < 3;
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id name total_amt
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1 A 10
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2 B 20
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EXPLAIN SELECT t2.id,t2.name,t.total_amt
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FROM t2
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LEFT JOIN
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(SELECT id, sum(amount) total_amt FROM t1 GROUP BY id) AS t
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ON t2.id=t.id
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WHERE t2.id < 3;
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id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY t2 range PRIMARY PRIMARY 4 NULL 2 Using where
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1 PRIMARY <derived2> ref key0 key0 5 test.t2.id 2
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2 LATERAL DERIVED t1 eq_ref PRIMARY PRIMARY 4 test.t2.id 1
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set join_cache_level=default;
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DROP TABLE t1,t2;
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