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https://github.com/MariaDB/server.git
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eb483c5181
- multi_range_read_info_const now uses the new records_in_range interface - Added handler::avg_io_cost() - Don't calculate avg_io_cost() in get_sweep_read_cost if avg_io_cost is not 1.0. In this case we trust the avg_io_cost() from the handler. - Changed test_quick_select to use TIME_FOR_COMPARE instead of TIME_FOR_COMPARE_IDX to align this with the rest of the code. - Fixed bug when using test_if_cheaper_ordering where we didn't use keyread if index was changed - Fixed a bug where we didn't use index only read when using order-by-index - Added keyread_time() to HEAP. The default keyread_time() was optimized for blocks and not suitable for HEAP. The effect was the HEAP prefered table scans over ranges for btree indexes. - Fixed get_sweep_read_cost() for HEAP tables - Ensure that range and ref have same cost for simple ranges Added a small cost (MULTI_RANGE_READ_SETUP_COST) to ranges to ensure we favior ref for range for simple queries. - Fixed that matching_candidates_in_table() uses same number of records as the rest of the optimizer - Added avg_io_cost() to JT_EQ_REF cost. This helps calculate the cost for HEAP and temporary tables better. A few tests changed because of this. - heap::read_time() and heap::keyread_time() adjusted to not add +1. This was to ensure that handler::keyread_time() doesn't give higher cost for heap tables than for normal tables. One effect of this is that heap and derived tables stored in heap will prefer key access as this is now regarded as cheap. - Changed cost for index read in sql_select.cc to match multi_range_read_info_const(). All index cost calculation is now done trough one function. - 'ref' will now use quick_cost for keys if it exists. This is done so that for '=' ranges, 'ref' is prefered over 'range'. - scan_time() now takes avg_io_costs() into account - get_delayed_table_estimates() uses block_size and avg_io_cost() - Removed default argument to test_if_order_by_key(); simplifies code
389 lines
11 KiB
Text
389 lines
11 KiB
Text
drop table if exists t1;
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create table t1 (a int not null,b int not null, primary key using BTREE (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
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t1 0 PRIMARY 1 a A NULL NULL NULL BTREE
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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 BTREE (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 BTREE (a)) engine=heap comment="testing heaps";
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insert into t1 values(-2,-2),(-1,-1),(0,0),(1,1),(2,2),(3,3),(4,4);
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delete from t1 where a > -3;
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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 BTREE (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 BTREE (a);
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select * from t1 where a > 736494;
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a
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802616
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869751
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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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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 range uniq_id uniq_id 4 NULL 4 Using where
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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 range uniq_id uniq_id 4 NULL 4 Using where; Using index
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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 BTREE (x,y), unique y using BTREE (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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explain select * from t1 where x=1;
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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 x x 4 const 1
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select * from t1 where x=1;
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x y
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1 1
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1 3
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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 BTREE (a,b), key using BTREE (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 1
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1 2
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1 3
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1 4
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1 5
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1 6
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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 1
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1 1
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1 2
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1 2
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1 3
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1 3
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1 4
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1 4
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1 5
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1 5
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1 6
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1 6
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explain select * from tx where a=x order by a,b;
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id select_type table type possible_keys key key_len ref rows Extra
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x SIMPLE tx ref a a x const x Using where
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explain select * from tx where a=x order by b;
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id select_type table type possible_keys key key_len ref rows Extra
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x SIMPLE tx ref a a x const x Using where
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select * from t1 where b=1;
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a b
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1 1
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1 1
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explain select * from tx where b=x;
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id select_type table type possible_keys key key_len ref rows Extra
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x SIMPLE tx ref b b x const x
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drop table t1;
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create table t1 (id int unsigned not null, primary key using BTREE (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 BTREE (btn)) engine=heap;
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insert into t1 values ("hello"),("hello"),("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 "i%";
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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 btn btn 10 NULL 1 Using where
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explain select * from t1 where btn like "h%";
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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 btn btn 10 NULL # Using where
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explain select * from t1 where btn like "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 range btn btn 10 NULL 1 Using where
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explain select * from t1 where btn like "b%";
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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 btn btn 10 NULL 1 Using where
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select * from t1 where btn like "ff%";
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btn
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select * from t1 where btn like " %";
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btn
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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 BTREE (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 ref btn btn 10 const 1 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 1 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 BTREE (a),
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UNIQUE b using BTREE (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 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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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, b int, c int, key using BTREE (a, b, c)) engine=heap;
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INSERT INTO t1 VALUES (1, NULL, NULL), (1, 1, NULL), (1, NULL, 1);
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SELECT * FROM t1 WHERE a=1 and b IS NULL;
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a b c
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1 NULL NULL
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1 NULL 1
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SELECT * FROM t1 WHERE a=1 and c IS NULL;
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a b c
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1 NULL NULL
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1 1 NULL
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SELECT * FROM t1 WHERE a=1 and b IS NULL and c IS NULL;
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a b c
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1 NULL NULL
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DROP TABLE t1;
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CREATE TABLE t1 (a int not null, primary key using BTREE (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(a int not null, key using btree(a)) engine=heap;
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insert into t1 values (2), (2), (2), (1), (1), (3), (3), (3), (3);
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select a from t1 where a > 2 order by a;
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a
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3
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3
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3
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3
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delete from t1 where a < 4;
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select a from t1 order by a;
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a
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insert into t1 values (2), (2), (2), (1), (1), (3), (3), (3), (3);
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select a from t1 where a > 4 order by a;
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a
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delete from t1 where a > 4;
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select a from t1 order by a;
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a
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1
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1
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2
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2
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2
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3
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3
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3
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3
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select a from t1 where a > 3 order by a;
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a
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delete from t1 where a >= 2;
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select a from t1 order by a;
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a
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1
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1
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drop table t1;
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CREATE TABLE t1 (
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c1 CHAR(3),
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c2 INTEGER,
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KEY USING BTREE(c1),
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KEY USING BTREE(c2)
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) ENGINE= MEMORY;
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INSERT INTO t1 VALUES ('ABC',0), ('A',0), ('B',0), ('C',0);
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UPDATE t1 SET c2= c2 + 1 WHERE c1 = 'A';
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SELECT * FROM t1;
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c1 c2
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ABC 0
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A 1
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B 0
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C 0
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DROP TABLE t1;
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CREATE TABLE t1 (
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c1 ENUM('1', '2'),
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UNIQUE USING BTREE(c1)
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) ENGINE= MEMORY DEFAULT CHARSET= utf8;
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INSERT INTO t1 VALUES('1'), ('2');
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DROP TABLE t1;
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CREATE TABLE t1 (
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c1 SET('1', '2'),
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UNIQUE USING BTREE(c1)
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) ENGINE= MEMORY DEFAULT CHARSET= utf8;
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INSERT INTO t1 VALUES('1'), ('2');
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DROP TABLE t1;
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CREATE TABLE t1 (a INT, KEY USING BTREE(a)) ENGINE=MEMORY;
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INSERT INTO t1 VALUES(1),(2),(2);
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DELETE FROM t1 WHERE a=2;
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SELECT * FROM t1;
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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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CREATE TABLE t1(val INT, KEY USING BTREE(val)) ENGINE=memory;
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INSERT INTO t1 VALUES(0);
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SELECT INDEX_LENGTH FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_SCHEMA=DATABASE() AND TABLE_NAME='t1';
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INDEX_LENGTH
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21
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UPDATE t1 SET val=1;
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SELECT INDEX_LENGTH FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_SCHEMA=DATABASE() AND TABLE_NAME='t1';
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INDEX_LENGTH
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21
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DROP TABLE t1;
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CREATE TABLE t1 (a INT, UNIQUE USING BTREE(a)) ENGINE=MEMORY;
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INSERT INTO t1 VALUES(NULL),(NULL);
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DROP TABLE t1;
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create table t1(a varchar(255), b varchar(255),
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key using btree (a,b)) engine=memory;
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insert into t1 values (1, 1), (3, 3), (2, 2), (NULL, 1), (NULL, NULL), (0, 0);
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select * from t1 where a is null;
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a b
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NULL NULL
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NULL 1
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drop table t1;
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#
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# bug#39918 - memory (heap) engine crashing while executing self join with delete
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#
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CREATE TABLE t1(a INT, KEY USING BTREE (a)) ENGINE=MEMORY;
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INSERT INTO t1 VALUES(1),(1);
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DELETE a1 FROM t1 AS a1, t1 AS a2 WHERE a1.a=a2.a;
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DROP TABLE t1;
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End of 5.0 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 BTREE (a);
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select 0+a from t1 where a > 736494;
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0+a
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802616
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869751
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explain select 0+a from t1 where a > 736494;
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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 uniq_id uniq_id 8 NULL 3 Using where
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select 0+a from t1 where a = 736494;
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0+a
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736494
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explain select 0+a from t1 where a = 736494;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 const uniq_id uniq_id 8 const 1
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select 0+a from t1 where a=869751 or a=736494;
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0+a
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736494
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869751
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explain select 0+a from t1 where a=869751 or a=736494;
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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 uniq_id uniq_id 8 NULL 2 Using where
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insert into t1 (a) select * from seq_1_to_100;
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select 0+a from t1 where a in (869751,736494,226312,802616);
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0+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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explain select 0+a 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 range uniq_id uniq_id 8 NULL 4 Using where
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drop table t1;
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End of 5.3 tests
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create table t1 (id int, a varchar(300) not null, key using btree(a)) engine=heap;
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insert t1 values (1, repeat('a', 300));
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drop table t1;
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End of 5.5 tests
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