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https://github.com/MariaDB/server.git
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2cfc450bf7
"Re-factor the code for post-join operations". The patch mainly contains the code ported from mysql-5.6 and created for two essential architectural changes: 1. WL#5558: Resolve ORDER BY execution method at the optimization stage 2. WL#6071: Inline tmp tables into the nested loops algorithm The first task was implemented for mysql-5.6 by Ole John Aske. It allows to make all decisions on ORDER BY operation at the optimization stage. The second task implemented for mysql-5.6 by Evgeny Potemkin adds JOIN_TAB nodes for post-join operations that require temporary tables. It allows to execute these operations within the nested loops algorithm that used to be used before this task only for join queries. Besides these task moves all planning on the execution of these operations from the execution phase to the optimization phase. Some other re-factoring changes of mysql-5.6 were pulled in, mainly because it was easier to pull them in than roll them back. In particular all changes concerning Ref_ptr_array were incorporated. The port required some changes in the MariaDB code that concerned the functionality of EXPLAIN and ANALYZE. This was done mainly by Sergey Petrunia.
148 lines
2.8 KiB
Text
148 lines
2.8 KiB
Text
drop table if exists t1;
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create table t1 (a int not null default 0 primary key, b int not null default 0);
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insert into t1 () values ();
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insert into t1 values (1,1),(2,1),(3,1);
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update t1 set a=4 where b=1 limit 1;
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select * from t1;
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a b
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0 0
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4 1
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2 1
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3 1
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update t1 set b=2 where b=1 limit 2;
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select * from t1;
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a b
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0 0
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4 2
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2 2
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3 1
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update t1 set b=4 where b=1;
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select * from t1;
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a b
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0 0
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4 2
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2 2
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3 4
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delete from t1 where b=2 limit 1;
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select * from t1;
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a b
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0 0
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2 2
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3 4
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delete from t1 limit 1;
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select * from t1;
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a b
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2 2
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3 4
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drop table t1;
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create table t1 (i int);
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insert into t1 (i) values(1),(1),(1);
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delete from t1 limit 1;
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update t1 set i=2 limit 1;
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delete from t1 limit 0;
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update t1 set i=3 limit 0;
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select * from t1;
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i
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2
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1
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drop table t1;
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select 0 limit 0;
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0
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CREATE TABLE t1(id int auto_increment primary key, id2 int, index(id2));
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INSERT INTO t1 (id2) values (0),(0),(0);
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DELETE FROM t1 WHERE id=1;
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INSERT INTO t1 SET id2=0;
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SELECT * FROM t1;
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id id2
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4 0
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2 0
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3 0
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DELETE FROM t1 WHERE id2 = 0 ORDER BY id LIMIT 1;
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SELECT * FROM t1;
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id id2
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4 0
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3 0
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DELETE FROM t1 WHERE id2 = 0 ORDER BY id desc LIMIT 1;
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SELECT * FROM t1;
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id id2
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3 0
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DROP TABLE t1;
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create table t1 (a integer);
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insert into t1 values (1);
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select 1 as a from t1 union all select 1 from dual limit 1;
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a
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1
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(select 1 as a from t1) union all (select 1 from dual) limit 1;
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a
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1
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drop table t1;
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create table t1 (a int);
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insert into t1 values (1),(2),(3),(4),(5),(6),(7);
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explain select count(*) c FROM t1 WHERE a > 0 ORDER BY c LIMIT 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 ALL NULL NULL NULL NULL 7 Using where
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select count(*) c FROM t1 WHERE a > 0 ORDER BY c LIMIT 3;
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c
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7
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explain select sum(a) c FROM t1 WHERE a > 0 ORDER BY c LIMIT 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 ALL NULL NULL NULL NULL 7 Using where
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select sum(a) c FROM t1 WHERE a > 0 ORDER BY c LIMIT 3;
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c
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28
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drop table t1;
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prepare s from "select 1 limit ?";
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set @a='qwe';
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execute s using @a;
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1
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set @a=-1;
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execute s using @a;
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ERROR HY000: Incorrect arguments to EXECUTE
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prepare s from "select 1 limit 1, ?";
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execute s using @a;
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ERROR HY000: Incorrect arguments to EXECUTE
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prepare s from "select 1 limit ?, ?";
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execute s using @a, @a;
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ERROR HY000: Incorrect arguments to EXECUTE
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set @a=14632475938453979136;
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execute s using @a, @a;
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1
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set @a=-14632475938453979136;
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execute s using @a, @a;
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ERROR HY000: Incorrect arguments to EXECUTE
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End of 5.0 tests
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select 1 as a limit 4294967296,10;
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a
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CREATE TABLE t1 (a int PRIMARY KEY auto_increment);
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INSERT INTO t1 VALUES (),(),(),(),(),(),(),(),(),();
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INSERT INTO t1 VALUES (),(),(),(),(),(),(),(),(),();
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SELECT a FROM t1 ORDER BY a LIMIT 10 OFFSET 1;
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a
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2
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3
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4
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5
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6
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7
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8
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9
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10
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11
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SELECT a FROM t1 ORDER BY a LIMIT 10 OFFSET 10;
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a
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11
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12
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13
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14
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15
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16
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17
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18
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19
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20
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SELECT a FROM t1 ORDER BY a LIMIT 2 OFFSET 14;
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a
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15
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16
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DROP TABLE t1;
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End of 5.1 tests
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