mirror of
https://github.com/MariaDB/server.git
synced 2025-05-13 01:01:44 +03:00
59b6472010
WL#2474 "Multi Range Read: Change the default MRR implementation to implement new MRR interface"
WL#2475 "Batched range read functions for MyISAM/InnoDb"
"Index condition pushdown for MyISAM/InnoDB"
- Adjust test results (checked)
- Code cleanup.
60 lines
2.4 KiB
Plaintext
60 lines
2.4 KiB
Plaintext
drop table if exists t1;
|
|
create table t1 (id int not null, str char(10), unique(str));
|
|
explain select * from t1;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t1 ALL NULL NULL NULL NULL 0
|
|
insert into t1 values (1, null),(2, null),(3, "foo"),(4, "bar");
|
|
select * from t1 where str is null;
|
|
id str
|
|
1 NULL
|
|
2 NULL
|
|
select * from t1 where str="foo";
|
|
id str
|
|
3 foo
|
|
explain select * from t1 where str is null;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t1 ref str str 11 const 1 Using where
|
|
explain select * from t1 where str="foo";
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t1 const str str 11 const 1
|
|
explain select * from t1 ignore key (str) where str="foo";
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t1 ALL NULL NULL NULL NULL 4 Using where
|
|
explain select * from t1 use key (str,str) where str="foo";
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t1 const str str 11 const 1
|
|
explain select * from t1 use key (str,str,foo) where str="foo";
|
|
ERROR 42000: Key 'foo' doesn't exist in table 't1'
|
|
explain select * from t1 ignore key (str,str,foo) where str="foo";
|
|
ERROR 42000: Key 'foo' doesn't exist in table 't1'
|
|
drop table t1;
|
|
explain select 1;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL No tables used
|
|
create table t1 (a int not null);
|
|
explain select count(*) from t1;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t1 ALL NULL NULL NULL NULL 0
|
|
insert into t1 values(1);
|
|
explain select count(*) from t1;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t1 ALL NULL NULL NULL NULL 1
|
|
insert into t1 values(1);
|
|
explain select count(*) from t1;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t1 ALL NULL NULL NULL NULL 2
|
|
drop table t1;
|
|
set names koi8r;
|
|
create table ÔÁÂ (ËÏÌ0 int, ËÏÌ1 int, key ÉÎÄ0 (ËÏÌ0), key ÉÎÄ01 (ËÏÌ0,ËÏÌ1));
|
|
insert into ÔÁÂ (ËÏÌ0) values (1);
|
|
insert into ÔÁÂ (ËÏÌ0) values (2);
|
|
explain select ËÏÌ0 from ÔÁÂ where ËÏÌ0=1;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE ÔÁÂ ref ÉÎÄ0,ÉÎÄ01 ÉÎÄ0 5 const 1 Using index
|
|
drop table ÔÁÂ;
|
|
set names latin1;
|
|
select 3 into @v1;
|
|
explain select 3 into @v1;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL No tables used
|