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dcbf2823c7
This patch effectively blocks the optimization that uses multiple equalities for ORDER BY to remove tmp table in the case when the first table happens to be the result of materialization of a semi-join nest. Currently there is no code at the execution level that would support the optimization in this case.
123 lines
3.4 KiB
Text
123 lines
3.4 KiB
Text
drop table if exists t0,t1,t2,t3;
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#
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# MDEV-6434: Wrong result (extra rows) with ORDER BY, multiple-column index, InnoDB
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#
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CREATE TABLE t1 (a INT, b INT, c INT, d TEXT, KEY idx(a,b,c)) ENGINE=InnoDB;
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INSERT INTO t1 (a,c) VALUES
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(8, 9),(8, 10),(13, 15),(16, 17),(16, 18),(16, 19),(20, 21),
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(20, 22),(20, 24),(20, 25),(20, 26),(20, 27),(20, 28);
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SELECT * FROM t1 WHERE a = 8 AND (b = 1 OR b IS NULL) ORDER BY c;
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a b c d
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8 NULL 9 NULL
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8 NULL 10 NULL
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DROP TABLE t1;
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#
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# MDEV-9457: Poor query plan chosen for ORDER BY query by a recent 10.1
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#
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create table t0 (a int);
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insert into t0 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
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create table t1 (
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pk int primary key,
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key1 int,
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key2 int,
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col1 char(255),
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key(key1),
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key(key2)
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) engine=innodb;
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set @a=-1;
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insert into t1
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select
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@a:=@a+1,
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@a,
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@a,
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repeat('abcd', 63)
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from t0 A, t0 B, t0 C, t0 D;
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# The following must NOT use 'index' on PK.
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# It should use index_merge(key1,key2) + filesort
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explain
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select *
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from t1
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where key1<3 or key2<3
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order by pk;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 index_merge key1,key2 key1,key2 5,5 NULL # Using sort_union(key1,key2); Using where; Using filesort
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explain
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select *
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from t1
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where key1<3 or key2<3;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 index_merge key1,key2 key1,key2 5,5 NULL # Using sort_union(key1,key2); Using where
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drop table t0, t1;
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#
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# MDEV-14071: wrong results with orderby_uses_equalities=on
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# (duplicate of MDEV-13994)
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#
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CREATE TABLE t1 (i int, j int, z int,PRIMARY KEY (i,j), KEY (z)) ENGINE=InnoDB;
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CREATE TABLE t2 (i int, j int, PRIMARY KEY (i,j)) ENGINE=InnoDB;
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CREATE TABLE t3 (j int, n varchar(5), PRIMARY KEY (j)) ENGINE=InnoDB;
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INSERT INTO t1 VALUES
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(127,0,1),(188,0,1),(206,0,1),(218,0,1),(292,0,1),(338,0,1),(375,0,1),
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(381,0,1),(409,0,1),(466,0,1),(469,0,1),(498,0,1),(656,0,1);
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INSERT INTO t1 VALUES
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(77,4,0),(86,7,0),(96,6,0),(96,7,0),(99,9,0),(99,10,0),(99,11,0),(104,4,0),
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(106,5,0),(148,6,0),(177,6,0),(181,5,0),(188,8,0),(218,8,0),(253,7,0),
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(268,4,0),(338,4,0),(409,7,0),(466,8,0),(469,8,0),(498,8,0),(656,8,0);
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INSERT INTO t2 VALUES
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(127,7),(188,8),(188,9),(206,6),(218,8),(218,9),(292,7),(338,4),(338,5),
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(375,6),(381,5),(409,7),(409,8),(466,8),(466,9),(469,8),(469,9),(498,8),
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(498,9),(656,8),(656,9);
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INSERT INTO t3 VALUES
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(4,'four'),(5,'five'),(6,'six'),(7,'seven'),(8,'eight'),(9,'nine');
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SET @save_optimizer_switch=@@optimizer_switch;
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SET optimizer_switch='orderby_uses_equalities=off';
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SELECT i,n
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FROM t1 INNER JOIN t2 USING (i,j) LEFT JOIN t3 USING (j)
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WHERE i IN (SELECT i FROM t1 WHERE z=1) AND z=0 ORDER BY i;
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i n
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188 eight
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218 eight
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338 four
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409 seven
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466 eight
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469 eight
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498 eight
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656 eight
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SELECT i,n
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FROM t1 x INNER JOIN t2 USING (i,j) LEFT JOIN t3 USING (j)
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WHERE EXISTS (SELECT * FROM t1 WHERE i=x.i AND z=1) AND z=0 ORDER BY i;
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i n
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188 eight
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218 eight
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338 four
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409 seven
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466 eight
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469 eight
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498 eight
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656 eight
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SET optimizer_switch='orderby_uses_equalities=on';
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SELECT i,n
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FROM t1 INNER JOIN t2 USING (i,j) LEFT JOIN t3 USING (j)
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WHERE i IN (SELECT i FROM t1 WHERE z=1) AND z=0 ORDER BY i;
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i n
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188 eight
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218 eight
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338 four
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409 seven
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466 eight
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469 eight
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498 eight
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656 eight
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SELECT i,n
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FROM t1 x INNER JOIN t2 USING (i,j) LEFT JOIN t3 USING (j)
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WHERE EXISTS (SELECT * FROM t1 WHERE i=x.i AND z=1) AND z=0 ORDER BY i;
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i n
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188 eight
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218 eight
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338 four
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409 seven
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466 eight
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469 eight
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498 eight
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656 eight
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set optimizer_switch= @save_optimizer_switch;
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DROP TABLE t1,t2,t3;
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