163 lines
5.3 KiB
Plaintext
163 lines
5.3 KiB
Plaintext
set optimizer_switch='index_condition_pushdown=on';
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SET sql_mode = 'NO_ENGINE_SUBSTITUTION';
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create table t1 (id int);
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insert into t1 values (null), (0);
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create table t2 (id int);
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insert into t2 values (null);
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select * from t1, t2 where t1.id = t2.id;
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id id
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alter table t1 add key id (id);
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select * from t1, t2 where t1.id = t2.id;
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id id
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drop table t1,t2;
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create table t1 (
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id integer,
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id2 integer not null,
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index (id),
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index (id2)
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);
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insert into t1 values(null,null),(1,1);
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Warnings:
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Warning 1048 Column 'id2' cannot be null
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select * from t1;
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id id2
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NULL 0
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1 1
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select * from t1 where id <=> null;
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id id2
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NULL 0
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select * from t1 where id <=> null or id > 0;
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id id2
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NULL 0
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1 1
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select * from t1 where id is null or id > 0;
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id id2
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NULL 0
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1 1
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select * from t1 where id2 <=> null or id2 > 0;
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id id2
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1 1
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select * from t1 where id2 is null or id2 > 0;
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id id2
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1 1
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delete from t1 where id <=> NULL;
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select * from t1;
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id id2
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1 1
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drop table t1;
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CREATE TABLE t1 (a int);
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CREATE TABLE t2 (a int, b int, INDEX idx(a));
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CREATE TABLE t3 (b int, INDEX idx(b));
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CREATE TABLE t4 (b int, INDEX idx(b));
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INSERT INTO t1 VALUES (1), (2), (3), (4);
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INSERT INTO t2 VALUES (1, 1), (3, 1);
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INSERT INTO t3 VALUES
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(NULL), (NULL), (NULL), (NULL), (NULL),
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(NULL), (NULL), (NULL), (NULL), (NULL);
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INSERT INTO t4 SELECT * FROM t3;
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INSERT INTO t3 SELECT * FROM t4;
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INSERT INTO t4 SELECT * FROM t3;
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INSERT INTO t3 SELECT * FROM t4;
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INSERT INTO t4 SELECT * FROM t3;
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INSERT INTO t3 SELECT * FROM t4;
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INSERT INTO t4 SELECT * FROM t3;
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INSERT INTO t3 SELECT * FROM t4;
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INSERT INTO t4 SELECT * FROM t3;
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INSERT INTO t3 SELECT * FROM t4;
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INSERT INTO t4 SELECT * FROM t3;
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INSERT INTO t3 SELECT * FROM t4;
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INSERT INTO t4 SELECT * FROM t3;
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INSERT INTO t3 SELECT * FROM t4;
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INSERT INTO t4 SELECT * FROM t3;
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INSERT INTO t3 SELECT * FROM t4;
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INSERT INTO t3 VALUES (2), (3);
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ANALYZE table t1, t2, t3;
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Table Op Msg_type Msg_text
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test.t1 analyze status OK
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test.t2 analyze status OK
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test.t3 analyze status OK
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SELECT COUNT(*) FROM t3;
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COUNT(*)
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15972
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EXPLAIN SELECT SQL_CALC_FOUND_ROWS * FROM t1 LEFT JOIN t2 ON t1.a=t2.a
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LEFT JOIN t3 ON t2.b=t3.b;
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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 NULL ALL NULL NULL NULL NULL # 100.00 NULL
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1 SIMPLE t2 NULL ALL idx NULL NULL NULL # 100.00 Using where; Using join buffer (Block Nested Loop)
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1 SIMPLE t3 NULL ref idx idx 5 test.t2.b # 100.00 Using index
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Warnings:
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Warning 1287 SQL_CALC_FOUND_ROWS is deprecated and will be removed in a future release. Consider using two separate queries instead.
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Note 1003 /* select#1 */ select sql_calc_found_rows `test`.`t1`.`a` AS `a`,`test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b`,`test`.`t3`.`b` AS `b` from `test`.`t1` left join `test`.`t2` on((`test`.`t2`.`a` = `test`.`t1`.`a`)) left join `test`.`t3` on((`test`.`t3`.`b` = `test`.`t2`.`b`)) where true
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FLUSH STATUS ;
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SELECT SQL_CALC_FOUND_ROWS * FROM t1 LEFT JOIN t2 ON t1.a=t2.a
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LEFT JOIN t3 ON t2.b=t3.b;
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a a b b
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1 1 1 NULL
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3 3 1 NULL
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2 NULL NULL NULL
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4 NULL NULL NULL
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Warnings:
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Warning 1287 SQL_CALC_FOUND_ROWS is deprecated and will be removed in a future release. Consider using two separate queries instead.
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SELECT FOUND_ROWS();
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FOUND_ROWS()
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4
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Warnings:
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Warning 1287 FOUND_ROWS() is deprecated and will be removed in a future release. Consider using COUNT(*) instead.
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SHOW STATUS LIKE "handler_read%";
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Variable_name Value
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Handler_read_first 2
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Handler_read_key 4
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Handler_read_last 0
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Handler_read_next 0
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Handler_read_prev 0
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Handler_read_rnd 0
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Handler_read_rnd_next 8
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DROP TABLE t1,t2,t3,t4;
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CREATE TABLE t1 (
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a int(11) default NULL,
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b int(11) default NULL,
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KEY a (a,b)
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);
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Warnings:
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Warning 1681 Integer display width is deprecated and will be removed in a future release.
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Warning 1681 Integer display width is deprecated and will be removed in a future release.
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INSERT INTO t1 VALUES (0,10),(0,11),(0,12);
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CREATE TABLE t2 (
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a int(11) default NULL,
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b int(11) default NULL,
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KEY a (a)
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);
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Warnings:
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Warning 1681 Integer display width is deprecated and will be removed in a future release.
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Warning 1681 Integer display width is deprecated and will be removed in a future release.
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INSERT INTO t2 VALUES (3,NULL),(3,11),(3,12);
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SELECT * FROM t2 inner join t1 WHERE ( t1.a = 0 OR t1.a IS NULL) AND t2.a = 3 AND t2.b = t1.b;
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a b a b
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3 11 0 11
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3 12 0 12
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drop table t1, t2;
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End of 5.0 tests
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#
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# Bug#54608 Query using IN + OR + IS TRUE and IS NULL returns
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# NULL when should be empty
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#
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CREATE TABLE t1 (a INT, KEY (a));
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INSERT INTO t1 VALUES (1), (2), (NULL);
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explain SELECT a FROM t1 WHERE a IN (42) OR (a IS TRUE AND a IS NULL);
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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 NULL ref_or_null a a 5 const 2 100.00 Using where; Using index
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Warnings:
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Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a` from `test`.`t1` where ((`test`.`t1`.`a` = 42) or (((0 <> `test`.`t1`.`a`) is true) and (`test`.`t1`.`a` is null)))
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SELECT a FROM t1 WHERE a IN (42) OR (a IS TRUE AND a IS NULL);
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a
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explain SELECT a FROM t1 WHERE a IN (42) OR (a=NULL);
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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 NULL ref_or_null a a 5 const # 100.00 Using where; Using index
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Warnings:
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Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a` from `test`.`t1` where ((`test`.`t1`.`a` = 42) or (`test`.`t1`.`a` = NULL))
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SELECT a FROM t1 WHERE a IN (42) OR (a=NULL);
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a
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drop table t1;
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SET sql_mode = default;
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set optimizer_switch=default;
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