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f691d9865b
This feature adds the functionality of ignorability for indexes. Indexes are not ignored be default. To control index ignorability explicitly for a new index, use IGNORE or NOT IGNORE as part of the index definition for CREATE TABLE, CREATE INDEX, or ALTER TABLE. Primary keys (explicit or implicit) cannot be made ignorable. The table INFORMATION_SCHEMA.STATISTICS get a new column named IGNORED that would store whether an index needs to be ignored or not.
470 lines
16 KiB
Text
470 lines
16 KiB
Text
drop table if exists t1,t2;
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create table t1 (a int not null,b int not null, primary key using HASH (a)) engine=heap comment="testing heaps" avg_row_length=100 min_rows=1 max_rows=100;
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insert into t1 values(1,1),(2,2),(3,3),(4,4);
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delete from t1 where a=1 or a=0;
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show keys from t1;
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Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment Ignored
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t1 0 PRIMARY 1 a NULL 3 NULL NULL HASH NO
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select * from t1;
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a b
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2 2
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3 3
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4 4
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select * from t1 where a=4;
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a b
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4 4
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update t1 set b=5 where a=4;
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update t1 set b=b+1 where a>=3;
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replace t1 values (3,3);
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select * from t1;
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a b
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2 2
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3 3
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4 6
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alter table t1 add c int not null, add key using HASH (c,a);
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drop table t1;
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create table t1 (a int not null,b int not null, primary key using HASH (a)) engine=heap comment="testing heaps";
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insert into t1 values(1,1),(2,2),(3,3),(4,4);
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delete from t1 where a > 0;
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select * from t1;
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a b
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drop table t1;
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create table t1 (a int not null,b int not null, primary key using HASH (a)) engine=heap comment="testing heaps";
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insert into t1 values(1,1),(2,2),(3,3),(4,4);
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alter table t1 modify a int not null auto_increment, engine=myisam, comment="new myisam table";
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select * from t1;
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a b
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1 1
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2 2
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3 3
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4 4
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drop table t1;
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create table t1 (a int not null) engine=heap;
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insert into t1 values (869751),(736494),(226312),(802616),(728912);
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select * from t1 where a > 736494;
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a
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869751
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802616
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alter table t1 add unique uniq_id using HASH (a);
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select * from t1 where a > 736494;
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a
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869751
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802616
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select * from t1 where a = 736494;
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a
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736494
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select * from t1 where a=869751 or a=736494;
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a
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736494
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869751
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select * from t1 where a in (869751,736494,226312,802616);
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a
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226312
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736494
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802616
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869751
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alter table t1 engine=myisam;
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explain select * from t1 where a in (869751,736494,226312,802616);
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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 uniq_id NULL NULL NULL 5 Using where
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drop table t1;
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create table t1 (x int not null, y int not null, key x using HASH (x), unique y using HASH (y))
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engine=heap;
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insert into t1 values (1,1),(2,2),(1,3),(2,4),(2,5),(2,6);
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select * from t1 where x=1;
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x y
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1 3
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1 1
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select * from t1,t1 as t2 where t1.x=t2.y;
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x y x y
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1 1 1 1
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2 2 2 2
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1 3 1 1
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2 4 2 2
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2 5 2 2
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2 6 2 2
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explain select * from t1,t1 as t2 where t1.x=t2.y;
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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 x NULL NULL NULL 6
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1 SIMPLE t2 eq_ref y y 4 test.t1.x 1
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drop table t1;
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create table t1 (a int) engine=heap;
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insert into t1 values(1);
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select max(a) from t1;
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max(a)
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1
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drop table t1;
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CREATE TABLE t1 ( a int not null default 0, b int not null default 0, key using HASH (a), key using HASH (b) ) ENGINE=HEAP;
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insert into t1 values(1,1),(1,2),(2,3),(1,3),(1,4),(1,5),(1,6);
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select * from t1 where a=1;
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a b
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1 6
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1 5
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1 4
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1 3
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1 2
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1 1
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insert into t1 values(1,1),(1,2),(2,3),(1,3),(1,4),(1,5),(1,6);
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select * from t1 where a=1;
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a b
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1 6
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1 5
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1 4
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1 3
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1 2
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1 1
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1 6
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1 5
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1 4
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1 3
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1 2
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1 1
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drop table t1;
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create table t1 (id int unsigned not null, primary key using HASH (id)) engine=HEAP;
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insert into t1 values(1);
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select max(id) from t1;
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max(id)
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1
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insert into t1 values(2);
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select max(id) from t1;
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max(id)
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2
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replace into t1 values(1);
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drop table t1;
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create table t1 (n int) engine=heap;
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drop table t1;
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create table t1 (n int) engine=heap;
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drop table if exists t1;
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CREATE table t1(f1 int not null,f2 char(20) not
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null,index(f2)) engine=heap;
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INSERT into t1 set f1=12,f2="bill";
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INSERT into t1 set f1=13,f2="bill";
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INSERT into t1 set f1=14,f2="bill";
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INSERT into t1 set f1=15,f2="bill";
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INSERT into t1 set f1=16,f2="ted";
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INSERT into t1 set f1=12,f2="ted";
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INSERT into t1 set f1=12,f2="ted";
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INSERT into t1 set f1=12,f2="ted";
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INSERT into t1 set f1=12,f2="ted";
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delete from t1 where f2="bill";
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select * from t1;
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f1 f2
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16 ted
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12 ted
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12 ted
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12 ted
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12 ted
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drop table t1;
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create table t1 (btn char(10) not null, key using HASH (btn)) engine=heap;
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insert into t1 values ("hello"),("hello"),("hello"),("hello"),("hello"),("a"),("b"),("c"),("d"),("e"),("f"),("g"),("h"),("i");
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explain select * from t1 where btn like "q%";
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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 btn NULL NULL NULL 14 Using where
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select * from t1 where btn like "q%";
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btn
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alter table t1 add column new_col char(1) not null, add key using HASH (btn,new_col), drop key btn;
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update t1 set new_col=left(btn,1);
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explain select * from t1 where btn="a";
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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 btn NULL NULL NULL 14 Using where
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explain select * from t1 where btn="a" and new_col="a";
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ref btn btn 11 const,const 2 Using where
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drop table t1;
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CREATE TABLE t1 (
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a int default NULL,
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b int default NULL,
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KEY a using HASH (a),
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UNIQUE b using HASH (b)
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) engine=heap;
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INSERT INTO t1 VALUES (NULL,99),(99,NULL),(1,1),(2,2),(1,3);
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SELECT * FROM t1 WHERE a=NULL;
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a b
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explain SELECT * FROM t1 WHERE a IS NULL;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ref a a 5 const 2 Using where
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SELECT * FROM t1 WHERE a<=>NULL;
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a b
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NULL 99
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SELECT * FROM t1 WHERE b=NULL;
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a b
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explain SELECT * FROM t1 WHERE b IS NULL;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ref b b 5 const 1 Using where
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SELECT * FROM t1 WHERE b<=>NULL;
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a b
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99 NULL
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INSERT INTO t1 VALUES (1,3);
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ERROR 23000: Duplicate entry '3' for key 'b'
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DROP TABLE t1;
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CREATE TABLE t1 (a int not null, primary key using HASH (a)) engine=heap;
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INSERT into t1 values (1),(2),(3),(4),(5),(6),(7),(8),(9),(10),(11);
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DELETE from t1 where a < 100;
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SELECT * from t1;
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a
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DROP TABLE t1;
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create table t1
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(
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a char(8) not null,
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b char(20) not null,
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c int not null,
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key (a)
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) engine=heap;
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insert into t1 values ('aaaa', 'prefill-hash=5',0);
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insert into t1 values ('aaab', 'prefill-hash=0',0);
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insert into t1 values ('aaac', 'prefill-hash=7',0);
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insert into t1 values ('aaad', 'prefill-hash=2',0);
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insert into t1 values ('aaae', 'prefill-hash=1',0);
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insert into t1 values ('aaaf', 'prefill-hash=4',0);
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insert into t1 values ('aaag', 'prefill-hash=3',0);
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insert into t1 values ('aaah', 'prefill-hash=6',0);
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explain select * from t1 where a='aaaa';
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ref a a 8 const 2 Using where
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explain select * from t1 where a='aaab';
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ref a a 8 const 2 Using where
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explain select * from t1 where a='aaac';
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ref a a 8 const 2 Using where
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explain select * from t1 where a='aaad';
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ref a a 8 const 2 Using where
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insert into t1 select * from t1;
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flush tables;
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explain select * from t1 where a='aaaa';
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ref a a 8 const 2 Using where
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explain select * from t1 where a='aaab';
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ref a a 8 const 2 Using where
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explain select * from t1 where a='aaac';
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ref a a 8 const 2 Using where
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explain select * from t1 where a='aaad';
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ref a a 8 const 2 Using where
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flush tables;
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explain select * from t1 where a='aaaa';
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ref a a 8 const 2 Using where
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explain select * from t1 where a='aaab';
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ref a a 8 const 2 Using where
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explain select * from t1 where a='aaac';
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ref a a 8 const 2 Using where
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explain select * from t1 where a='aaad';
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ref a a 8 const 2 Using where
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create table t2 as select * from t1;
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delete from t1;
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insert into t1 select * from t2;
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explain select * from t1 where a='aaaa';
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ref a a 8 const 2 Using where
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explain select * from t1 where a='aaab';
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ref a a 8 const 2 Using where
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explain select * from t1 where a='aaac';
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ref a a 8 const 2 Using where
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explain select * from t1 where a='aaad';
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ref a a 8 const 2 Using where
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drop table t1, t2;
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create table t1 (
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id int unsigned not null primary key auto_increment,
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name varchar(20) not null,
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index heap_idx(name),
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index btree_idx using btree(name)
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) engine=heap;
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create table t2 (
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id int unsigned not null primary key auto_increment,
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name varchar(20) not null,
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index btree_idx using btree(name),
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index heap_idx(name)
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) engine=heap;
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insert into t1 (name) values ('Matt'), ('Lilu'), ('Corbin'), ('Carly'),
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('Suzy'), ('Hoppy'), ('Burrito'), ('Mimi'), ('Sherry'), ('Ben'), ('Phil'),
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('Emily'), ('Mike');
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insert into t2 select * from t1;
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explain select * from t1 where name='matt';
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ref heap_idx,btree_idx btree_idx 22 const 1 Using where
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explain select * from t2 where name='matt';
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t2 ref btree_idx,heap_idx btree_idx 22 const 1 Using where
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explain select * from t1 where name='Lilu';
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ref heap_idx,btree_idx btree_idx 22 const 1 Using where
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explain select * from t2 where name='Lilu';
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t2 ref btree_idx,heap_idx btree_idx 22 const 1 Using where
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explain select * from t1 where name='Phil';
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ref heap_idx,btree_idx btree_idx 22 const 1 Using where
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explain select * from t2 where name='Phil';
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t2 ref btree_idx,heap_idx btree_idx 22 const 1 Using where
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explain select * from t1 where name='Lilu';
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ref heap_idx,btree_idx btree_idx 22 const 1 Using where
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explain select * from t2 where name='Lilu';
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t2 ref btree_idx,heap_idx btree_idx 22 const 1 Using where
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insert into t1 (name) select name from t2;
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insert into t1 (name) select name from t2;
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insert into t1 (name) select name from t2;
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insert into t1 (name) select name from t2;
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insert into t1 (name) select name from t2;
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insert into t1 (name) select name from t2;
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flush tables;
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select count(*) from t1 where name='Matt';
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count(*)
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7
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explain select * from t1 ignore index (btree_idx) where name='matt';
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ref heap_idx heap_idx 22 const 7 Using where
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show index from t1;
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Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment Ignored
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t1 0 PRIMARY 1 id NULL 91 NULL NULL HASH NO
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t1 1 heap_idx 1 name NULL 13 NULL NULL HASH NO
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t1 1 btree_idx 1 name A NULL NULL NULL BTREE NO
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show index from t1;
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Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment Ignored
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t1 0 PRIMARY 1 id NULL 91 NULL NULL HASH NO
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t1 1 heap_idx 1 name NULL 13 NULL NULL HASH NO
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t1 1 btree_idx 1 name A NULL NULL NULL BTREE NO
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create table t3
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(
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a varchar(20) not null,
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b varchar(20) not null,
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key (a,b)
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) engine=heap;
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insert into t3 select name, name from t1;
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show index from t3;
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Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment Ignored
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t3 1 a 1 a NULL NULL NULL NULL HASH NO
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t3 1 a 2 b NULL 13 NULL NULL HASH NO
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show index from t3;
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Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment Ignored
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t3 1 a 1 a NULL NULL NULL NULL HASH NO
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t3 1 a 2 b NULL 13 NULL NULL HASH NO
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explain select * from t1 ignore key(btree_idx), t3 where t1.name='matt' and t3.a = concat('',t1.name) and t3.b=t1.name;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ref heap_idx heap_idx 22 const 7 Using where
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1 SIMPLE t3 ref a a 44 func,const 7 Using where
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drop table t1, t2, t3;
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create temporary table t1 ( a int, index (a) ) engine=memory;
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insert into t1 values (1),(2),(3),(4),(5);
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select a from t1 where a in (1,3);
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a
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1
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3
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explain select a from t1 where a in (1,3);
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 range a a 5 NULL 4 Using where
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drop table t1;
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End of 4.1 tests
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CREATE TABLE t1(col1 VARCHAR(32) CHARACTER SET utf8 COLLATE utf8_bin NOT NULL,
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col2 VARCHAR(32) CHARACTER SET utf8 COLLATE utf8_bin NOT NULL,
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UNIQUE KEY key1 USING HASH (col1, col2)) ENGINE=MEMORY;
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INSERT INTO t1 VALUES('A', 'A');
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INSERT INTO t1 VALUES('A ', 'A ');
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ERROR 23000: Duplicate entry 'A -A ' for key 'key1'
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DROP TABLE t1;
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CREATE TABLE t1(col1 VARCHAR(32) CHARACTER SET latin1 COLLATE latin1_bin NOT NULL,
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col2 VARCHAR(32) CHARACTER SET latin1 COLLATE latin1_bin NOT NULL,
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UNIQUE KEY key1 USING HASH (col1, col2)) ENGINE=MEMORY;
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INSERT INTO t1 VALUES('A', 'A');
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INSERT INTO t1 VALUES('A ', 'A ');
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ERROR 23000: Duplicate entry 'A -A ' for key 'key1'
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DROP TABLE t1;
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End of 5.0 tests
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#
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# MDEV-568 (AKA LP BUG#1007981, AKA MySQL bug#44771)
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# Wrong result for a hash index look-up if the index is unique and
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# the key is NULL
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#
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CREATE TABLE t1 ( pk INT PRIMARY KEY, val INT, UNIQUE KEY USING HASH(val)) ENGINE=MEMORY;
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INSERT INTO t1 VALUES (1, NULL);
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INSERT INTO t1 VALUES (2, NULL);
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INSERT INTO t1 VALUES (3, 1);
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INSERT INTO t1 VALUES (4, NULL);
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EXPLAIN SELECT * FROM t1 WHERE val IS NULL;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ref val val 5 const 1 Using where
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SELECT * FROM t1 WHERE val IS NULL;
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pk val
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4 NULL
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2 NULL
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1 NULL
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drop table t1;
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End of 5.2 tests
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# bit index in heap tables
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create table t1 (a bit(63) not null) engine=heap;
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insert into t1 values (869751),(736494),(226312),(802616),(728912);
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alter table t1 add unique uniq_id using HASH (a);
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select 0+a from t1 where a > 736494;
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0+a
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869751
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802616
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explain select 0+a from t1 where a > 736494;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t1 ALL uniq_id NULL NULL NULL 5 Using where
|
|
select 0+a from t1 where a = 736494;
|
|
0+a
|
|
736494
|
|
explain select 0+a from t1 where a = 736494;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t1 const uniq_id uniq_id 8 const 1
|
|
select 0+a from t1 where a=869751 or a=736494;
|
|
0+a
|
|
736494
|
|
869751
|
|
explain select 0+a from t1 where a=869751 or a=736494;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t1 range uniq_id uniq_id 8 NULL 2 Using where
|
|
select 0+a from t1 where a in (869751,736494,226312,802616,728912);
|
|
0+a
|
|
226312
|
|
728912
|
|
736494
|
|
802616
|
|
869751
|
|
explain select 0+a from t1 where a in (869751,736494,226312,802616,728912);
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t1 range uniq_id uniq_id 8 NULL 5 Using where
|
|
drop table t1;
|
|
End of 5.3 tests
|
|
#
|
|
# Bug #55472: Assertion failed in heap_rfirst function of hp_rfirst.c
|
|
# on DELETE statement
|
|
#
|
|
CREATE TABLE t1 (col_int_nokey INT,
|
|
col_int_key INT,
|
|
INDEX(col_int_key) USING HASH) ENGINE = HEAP;
|
|
INSERT INTO t1 (col_int_nokey, col_int_key) VALUES (3, 0), (4, 0), (3, 1);
|
|
DELETE FROM t1 WHERE col_int_nokey = 5 ORDER BY col_int_key LIMIT 2;
|
|
DROP TABLE t1;
|
|
#
|
|
# Bug #1002564: Wrong result for a lookup query from a heap table
|
|
#
|
|
CREATE TABLE t1 (c1 VARCHAR(10) NOT NULL, KEY i1 (c1(3))) ENGINE=MEMORY DEFAULT CHARSET=latin1;
|
|
INSERT INTO t1 VALUES ('foo1'), ('bar2'), ('baz3');
|
|
explain SELECT * FROM t1 WHERE c1='bar2';
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t1 ref i1 i1 5 const 2 Using where
|
|
SELECT * FROM t1 WHERE c1='bar2';
|
|
c1
|
|
bar2
|
|
ALTER TABLE t1 DROP KEY i1, ADD KEY il (c1(3)) using btree;
|
|
explain SELECT * FROM t1 WHERE c1='bar2';
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t1 ref il il 5 const 1 Using where
|
|
SELECT * FROM t1 WHERE c1='bar2';
|
|
c1
|
|
bar2
|
|
DROP TABLE t1;
|
|
End of 5.5 tests
|