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