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c17bf5cb23
WHERE is present. If a DELETE statement with ORDER BY and LIMIT contains a WHERE clause with conditions that for sure cannot be used for index access (like in WHERE @var:= field) the execution always follows the filesort path. It happens currently even when for the above case there is an index that can be used to speedup sorting by the order by list. Now if a DELETE statement with ORDER BY and LIMIT contains such WHERE clause conditions that cannot be used to build any quick select then the mysql_delete() tries to use an index like there is no WHERE clause at all.
196 lines
4.7 KiB
Text
196 lines
4.7 KiB
Text
drop table if exists t1,t11,t12,t2;
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CREATE TABLE t1 (a tinyint(3), b tinyint(5));
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INSERT INTO t1 VALUES (1,1);
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INSERT LOW_PRIORITY INTO t1 VALUES (1,2);
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INSERT INTO t1 VALUES (1,3);
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DELETE from t1 where a=1 limit 1;
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DELETE LOW_PRIORITY from t1 where a=1;
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INSERT INTO t1 VALUES (1,1);
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DELETE from t1;
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LOCK TABLE t1 write;
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INSERT INTO t1 VALUES (1,2);
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DELETE from t1;
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UNLOCK TABLES;
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INSERT INTO t1 VALUES (1,2);
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SET AUTOCOMMIT=0;
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DELETE from t1;
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SET AUTOCOMMIT=1;
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drop table t1;
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create table t1 (
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a bigint not null,
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b bigint not null default 0,
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c bigint not null default 0,
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d bigint not null default 0,
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e bigint not null default 0,
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f bigint not null default 0,
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g bigint not null default 0,
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h bigint not null default 0,
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i bigint not null default 0,
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j bigint not null default 0,
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primary key (a,b,c,d,e,f,g,h,i,j));
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insert into t1 (a) values (2),(4),(6),(8),(10),(12),(14),(16),(18),(20),(22),(24),(26),(23);
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delete from t1 where a=26;
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drop table t1;
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create table t1 (
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a bigint not null,
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b bigint not null default 0,
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c bigint not null default 0,
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d bigint not null default 0,
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e bigint not null default 0,
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f bigint not null default 0,
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g bigint not null default 0,
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h bigint not null default 0,
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i bigint not null default 0,
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j bigint not null default 0,
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primary key (a,b,c,d,e,f,g,h,i,j));
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insert into t1 (a) values (2),(4),(6),(8),(10),(12),(14),(16),(18),(20),(22),(24),(26),(23),(27);
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delete from t1 where a=27;
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drop table t1;
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CREATE TABLE `t1` (
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`i` int(10) NOT NULL default '0',
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`i2` int(10) NOT NULL default '0',
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PRIMARY KEY (`i`)
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);
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DELETE FROM t1 USING t1 WHERE post='1';
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ERROR 42S22: Unknown column 'post' in 'where clause'
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drop table t1;
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CREATE TABLE t1 (
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bool char(0) default NULL,
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not_null varchar(20) binary NOT NULL default '',
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misc integer not null,
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PRIMARY KEY (not_null)
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) ENGINE=MyISAM;
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INSERT INTO t1 VALUES (NULL,'a',4), (NULL,'b',5), (NULL,'c',6), (NULL,'d',7);
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select * from t1 where misc > 5 and bool is null;
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bool not_null misc
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NULL c 6
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NULL d 7
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delete from t1 where misc > 5 and bool is null;
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select * from t1 where misc > 5 and bool is null;
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bool not_null misc
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select count(*) from t1;
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count(*)
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2
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delete from t1 where 1 > 2;
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select count(*) from t1;
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count(*)
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2
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delete from t1 where 3 > 2;
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select count(*) from t1;
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count(*)
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0
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drop table t1;
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create table t1 (a int not null auto_increment primary key, b char(32));
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insert into t1 (b) values ('apple'), ('apple');
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select * from t1;
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a b
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1 apple
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2 apple
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delete t1 from t1, t1 as t2 where t1.b = t2.b and t1.a > t2.a;
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select * from t1;
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a b
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1 apple
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drop table t1;
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create table t11 (a int NOT NULL, b int, primary key (a));
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create table t12 (a int NOT NULL, b int, primary key (a));
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create table t2 (a int NOT NULL, b int, primary key (a));
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insert into t11 values (0, 10),(1, 11),(2, 12);
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insert into t12 values (33, 10),(0, 11),(2, 12);
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insert into t2 values (1, 21),(2, 12),(3, 23);
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select * from t11;
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a b
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0 10
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1 11
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2 12
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select * from t12;
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a b
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33 10
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0 11
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2 12
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select * from t2;
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a b
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1 21
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2 12
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3 23
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delete t11.*, t12.* from t11,t12 where t11.a = t12.a and t11.b <> (select b from t2 where t11.a < t2.a);
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ERROR 21000: Subquery returns more than 1 row
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select * from t11;
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a b
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0 10
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1 11
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2 12
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select * from t12;
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a b
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33 10
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0 11
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2 12
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delete ignore t11.*, t12.* from t11,t12 where t11.a = t12.a and t11.b <> (select b from t2 where t11.a < t2.a);
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Warnings:
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Error 1242 Subquery returns more than 1 row
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Error 1242 Subquery returns more than 1 row
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select * from t11;
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a b
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0 10
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1 11
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select * from t12;
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a b
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33 10
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0 11
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insert into t11 values (2, 12);
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delete from t11 where t11.b <> (select b from t2 where t11.a < t2.a);
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ERROR 21000: Subquery returns more than 1 row
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select * from t11;
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a b
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0 10
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1 11
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2 12
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delete ignore from t11 where t11.b <> (select b from t2 where t11.a < t2.a);
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Warnings:
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Error 1242 Subquery returns more than 1 row
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Error 1242 Subquery returns more than 1 row
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select * from t11;
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a b
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0 10
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1 11
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drop table t11, t12, t2;
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create table t1 (a int, b int, unique key (a), key (b));
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insert into t1 values (3, 3), (7, 7);
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delete t1 from t1 where a = 3;
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check table t1;
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Table Op Msg_type Msg_text
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test.t1 check status OK
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select * from t1;
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a b
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7 7
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drop table t1;
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CREATE TABLE t1 ( a int PRIMARY KEY );
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DELETE FROM t1 WHERE t1.a > 0 ORDER BY t1.a;
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INSERT INTO t1 VALUES (0),(1),(2);
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DELETE FROM t1 WHERE t1.a > 0 ORDER BY t1.a LIMIT 1;
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SELECT * FROM t1;
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a
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0
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2
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DROP TABLE t1;
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create table t1 (a int);
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delete `4.t1` from t1 as `4.t1` where `4.t1`.a = 5;
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delete FROM `4.t1` USING t1 as `4.t1` where `4.t1`.a = 5;
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drop table t1;
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create table t1(a date not null);
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insert into t1 values (0);
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select * from t1 where a is null;
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a
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0000-00-00
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delete from t1 where a is null;
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select count(*) from t1;
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count(*)
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0
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drop table t1;
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create table t1(f1 int primary key);
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insert into t1 values (4),(3),(1),(2);
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delete from t1 where (@a:= f1) order by f1 limit 1;
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select @a;
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@a
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1
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drop table t1;
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End of 4.1 tests
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