105 lines
5.3 KiB
Plaintext
105 lines
5.3 KiB
Plaintext
#
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# Bug#18167648: WRONG RESULTS WITH PARTITIONING, INDEX_MERGE AND NO PK
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#
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CREATE TABLE t1 (
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a smallint,
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b smallint,
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c smallint,
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KEY a (a),
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KEY b (b)
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) ENGINE = MyISAM
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PARTITION BY HASH (c) PARTITIONS 3;
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Warnings:
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Warning 1287 The partition engine, used by table 'test.t1', is deprecated and will be removed in a future release. Please use native partitioning instead.
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CREATE TABLE t2 (a tinyint) ENGINE = MyISAM;
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INSERT INTO t2 VALUES (1),(2),(3),(4),(5),(6),(7),(8),(9),(10),(11),(12),(13),
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(14),(15),(16);
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SET SESSION optimizer_switch="index_merge=on";
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SET SESSION optimizer_switch="index_merge_intersection=on";
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SET SESSION optimizer_switch="index_merge_union=off";
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SET SESSION optimizer_switch="index_merge_sort_union=off";
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INSERT INTO t1 VALUES (1,1,0), (1,1,0), (2,1,0), (2,2,1), (1,1,1), (2,2,4);
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Warnings:
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Warning 1287 The partition engine, used by table 'test.t1', is deprecated and will be removed in a future release. Please use native partitioning instead.
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# Add some rows to make the index_merge_intersect possible
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INSERT INTO t1 SELECT 1,1,0 FROM t2 A, t2 B;
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INSERT INTO t1 SELECT 1,1,1 FROM t2 A, t2 B;
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INSERT INTO t1 SELECT 1,1,2 FROM t2 A, t2 B LIMIT 68;
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SELECT COUNT(*) FROM t1;
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COUNT(*)
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586
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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 OK
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test.t1 analyze warning The partition engine, used by table 'test.t1', is deprecated and will be removed in a future release. Please use native partitioning instead.
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EXPLAIN SELECT a,b,c FROM t1 WHERE b = 2 AND a = 2;
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id select_type table partitions type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE t1 p0,p1,p2 index_merge a,b b,a 3,3 NULL 1 100.00 Using intersect(b,a); Using where
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Warnings:
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Warning 1287 The partition engine, used by table 'test.t1', is deprecated and will be removed in a future release. Please use native partitioning instead.
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Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t1`.`c` AS `c` from `test`.`t1` where ((`test`.`t1`.`a` = 2) and (`test`.`t1`.`b` = 2))
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# Before fix:
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# (p0 - partition 0, R3 - 3rd record in that partition = offset)
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# Make 'a' read p0-R3, p1-R1, p1-R3
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# Make 'b' read p1-R1, p1-R3
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# 'b' will skip p1-R1 since R3 is bigger than R1.
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SELECT a,b,c FROM t1 WHERE b = 2 AND a = 2;
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a b c
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2 2 1
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2 2 4
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SET @old_opt_switch = @@session.optimizer_switch;
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SET SESSION optimizer_switch="index_merge_intersection=off";
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# Without index_merge_intersection
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SELECT a,b,c FROM t1 WHERE b = 2 AND a = 2;
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a b c
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2 2 1
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2 2 4
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EXPLAIN SELECT a,b,c FROM t1 WHERE b = 2 AND a = 2;
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id select_type table partitions type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE t1 p0,p1,p2 ref a,b b 3 const 2 2.50 Using where
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Warnings:
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Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t1`.`c` AS `c` from `test`.`t1` where ((`test`.`t1`.`a` = 2) and (`test`.`t1`.`b` = 2))
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SET SESSION optimizer_switch="index_merge_union=on";
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EXPLAIN SELECT a,b,c FROM t1 WHERE (b = 2 OR a = 2) AND c > 0 AND c < 100;
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id select_type table partitions type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE t1 p0,p1,p2 index_merge a,b b,a 3,3 NULL 5 11.11 Using union(b,a); Using where
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Warnings:
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Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t1`.`c` AS `c` from `test`.`t1` where (((`test`.`t1`.`b` = 2) or (`test`.`t1`.`a` = 2)) and (`test`.`t1`.`c` > 0) and (`test`.`t1`.`c` < 100))
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SELECT a,b,c FROM t1 WHERE (b = 2 OR a = 2) AND c > 0 AND c < 100;
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a b c
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2 2 1
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2 2 4
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SET SESSION optimizer_switch="index_merge_union=off";
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SELECT a,b,c FROM t1 WHERE (b = 2 OR a = 2) AND c > 0 AND c < 100;
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a b c
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2 2 1
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2 2 4
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EXPLAIN SELECT a,b,c FROM t1 WHERE (b = 2 OR a = 2) AND c > 0 AND c < 100;
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id select_type table partitions type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE t1 p0,p1,p2 ALL a,b NULL NULL NULL 586 6.29 Using where
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Warnings:
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Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t1`.`c` AS `c` from `test`.`t1` where (((`test`.`t1`.`b` = 2) or (`test`.`t1`.`a` = 2)) and (`test`.`t1`.`c` > 0) and (`test`.`t1`.`c` < 100))
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SET SESSION optimizer_switch="index_merge_sort_union=on";
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EXPLAIN SELECT a,b,c FROM t1 WHERE (b >= 2 OR a >= 2) AND c > 0 AND c < 100;
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id select_type table partitions type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE t1 p0,p1,p2 index_merge a,b b,a 3,3 NULL 10 11.11 Using sort_union(b,a); Using where
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Warnings:
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Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t1`.`c` AS `c` from `test`.`t1` where (((`test`.`t1`.`b` >= 2) or (`test`.`t1`.`a` >= 2)) and (`test`.`t1`.`c` > 0) and (`test`.`t1`.`c` < 100))
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# Not affected, added for completeness...
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SELECT a,b,c FROM t1 WHERE (b >= 2 OR a >= 2) AND c > 0 AND c < 100;
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a b c
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2 2 1
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2 2 4
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SET SESSION optimizer_switch="index_merge_sort_union=off";
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SELECT a,b,c FROM t1 WHERE (b >= 2 OR a >= 2) AND c > 0 AND c < 100;
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a b c
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2 2 1
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2 2 4
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EXPLAIN SELECT a,b,c FROM t1 WHERE (b >= 2 OR a >= 2) AND c > 0 AND c < 100;
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id select_type table partitions type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE t1 p0,p1,p2 ALL a,b NULL NULL NULL 586 6.17 Using where
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Warnings:
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Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t1`.`c` AS `c` from `test`.`t1` where (((`test`.`t1`.`b` >= 2) or (`test`.`t1`.`a` >= 2)) and (`test`.`t1`.`c` > 0) and (`test`.`t1`.`c` < 100))
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SET @@session.optimizer_switch = @old_opt_switch;
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DROP TABLE t1, t2;
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