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Fix for bug#5138: hash indexes on heap tables support statistics.
KEY::rec_per_key is updated every time 1/HEAP_STATS_UPDATE_THRESHOLD part of table records has been changed. heap/_check.c: Hash indexes on heap tables now support statistics - number of hash buckets. The value is updated on any insert/delete operation. heap/hp_clear.c: Hash indexes on heap tables now support statistics - number of hash buckets. The value is updated on any insert/delete operation. heap/hp_create.c: Hash indexes on heap tables now support statistics - number of hash buckets. The value is updated on any insert/delete operation. heap/hp_delete.c: Hash indexes on heap tables now support statistics - number of hash buckets. The value is updated on any insert/delete operation. heap/hp_hash.c: Hash indexes on heap tables now support statistics - number of hash buckets. The value is updated on any insert/delete operation. heap/hp_write.c: Hash indexes on heap tables now support statistics - number of hash buckets. The value is updated on any insert/delete operation. include/heap.h: Hash indexes on heap tables now support statistics - number of hash buckets. The value is updated on any insert/delete operation. mysql-test/r/heap.result: Fix for bug#5138: store/use statistics for hash indexes on heap tables mysql-test/r/heap_hash.result: Fix for bug#5138: store/use statistics for hash indexes on heap tables mysql-test/r/myisam.result: Fix for bug#5138: store/use statistics for hash indexes on heap tables mysql-test/t/heap_hash.test: Fix for bug#5138: store/use statistics for hash indexes on heap tables sql/structs.h: Added comments
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@ -1,10 +1,10 @@
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drop table if exists t1;
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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
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t1 0 PRIMARY 1 a NULL NULL NULL NULL HASH
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t1 0 PRIMARY 1 a NULL 3 NULL NULL HASH
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select * from t1;
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a b
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2 2
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@ -169,7 +169,7 @@ 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 11 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 10 Using where
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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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@ -182,7 +182,7 @@ 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 10 Using where
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1 SIMPLE t1 ref a a 5 const 1 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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@ -203,3 +203,139 @@ 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 1 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 1 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 1 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 1 Using where
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insert into t1 select * from t1;
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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 heap_idx 20 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 20 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 heap_idx 20 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 20 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 heap_idx 20 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 20 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 heap_idx 20 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 20 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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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 20 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
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t1 0 PRIMARY 1 id NULL 91 NULL NULL HASH
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t1 1 heap_idx 1 name NULL 15 NULL NULL HASH
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t1 1 btree_idx 1 name A NULL NULL NULL BTREE
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flush tables;
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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
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t1 0 PRIMARY 1 id NULL 91 NULL NULL HASH
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t1 1 heap_idx 1 name NULL 13 NULL NULL HASH
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t1 1 btree_idx 1 name A NULL NULL NULL BTREE
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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
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t3 1 a 1 a NULL NULL NULL NULL HASH
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t3 1 a 2 b NULL 15 NULL NULL HASH
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flush tables;
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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
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t3 1 a 1 a NULL NULL NULL NULL HASH
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t3 1 a 2 b NULL 13 NULL NULL HASH
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drop table t1,t2;
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