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3fa99f0c0e
The main difference in code path between EQ_REF and REF is that for REF we have to do an extra read_next on the index to check that there is no more matching rows. Before this patch we added a preference of EQ_REF by ensuring that REF would always estimate to find at least 2 rows. This patch adds the cost of the extra key read_next to REF access and removes the code that limited REF to at least 2 rows. For some queries this can have a big effect as the total estimated rows will be halved for each REF table with 1 rows. multi_range cost calculations are also changed to take into account the difference between EQ_REF and REF. The effect of the patch to the test suite: - About 80 test case changed - Almost all changes where for EXPLAIN where estimated rows for REF where changed from 2 to 1. - A few test cases using explain extended had a change of 'filtered'. This is because of the estimated rows are now closer to the calculated selectivity. - A very few test had a change of table order. This is because the change of estimated rows from 2 to 1 or the small cost change for REF (main.subselect_sj_jcl6, main.group_by, main.dervied_cond_pushdown, main.distinct, main.join_nested, main.order_by, main.join_cache) - No key statistics and the estimated rows are now smaller which cased estimated filtering to be lower. (main.subselect_sj_mat) - The number of total rows are halved. (main.derived_cond_pushdown) - Plans with 1 row changed to use RANGE instead of REF. (main.group_min_max) - ALL changed to REF (main.key_diff) - Key changed from ref + index_only to PRIMARY key for InnoDB, as OPTIMIZER_ROW_LOOKUP_COST + OPTIMIZER_ROW_NEXT_FIND_COST is smaller than OPTIMIZER_KEY_LOOKUP_COST + OPTIMIZER_KEY_NEXT_FIND_COST. (main.join_outer_innodb) - Cost changes printouts (main.opt_trace*) - Result order change (innodb_gis.rtree)
477 lines
15 KiB
Text
477 lines
15 KiB
Text
drop table if exists t1,t2;
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create table t1 (a int, b int not null,unique key (a,b),index(b)) engine=myisam;
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insert ignore into t1 values (1,1),(2,2),(3,3),(4,4),(5,5),(6,6),(null,7),(9,9),(8,8),(7,7),(null,9),(null,9),(6,6);
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Warnings:
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Warning 1062 Duplicate entry '6-6' for key 'a'
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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 3 Using where; Using index
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explain select * from t1 where a is null and b = 2;
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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,b a 9 const,const 1 Using where; Using index
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explain select * from t1 where a is null and b = 7;
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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,b a 9 const,const 1 Using where; Using index
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explain select * from t1 where a=2 and b = 2;
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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 a,b a 9 const,const 1 Using index
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explain select * from t1 where a<=>b limit 2;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 index NULL a 9 NULL 12 Using where; Using index
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explain select * from t1 where (a is null or a > 0 and a < 2) and b < 5 limit 3;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 range a,b a 9 NULL 2 Using where; Using index
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explain select * from t1 where (a is null or a = 7) and b=7;
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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_or_null a,b a 9 const,const 2 Using where; Using index
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explain select * from t1 where (a is null or a = 7) and b=7 order by 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_or_null a,b a 9 const,const 2 Using where; Using index; Using filesort
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explain select * from t1 where (a is null and b>a) or a is null and b=7 limit 2;
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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,b a 5 const 3 Using where; Using index
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explain select * from t1 where a is null and b=9 or a is null and b=7 limit 3;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 range a,b a 9 NULL 3 Using where; Using index
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explain select * from t1 where a > 1 and a < 3 limit 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 range a a 5 NULL 1 Using where; Using index
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explain select * from t1 where a > 8 and a < 9;
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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 1 Using where; Using index
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select * from t1 where a is null;
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a b
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NULL 7
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NULL 9
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NULL 9
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select * from t1 where a is null and b = 7;
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a b
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NULL 7
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select * from t1 where a<=>b limit 2;
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a b
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1 1
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2 2
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select * from t1 where (a is null or a > 0 and a < 3) and b < 5 limit 3;
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a b
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1 1
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2 2
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select * from t1 where (a is null or a > 0 and a < 3) and b > 7 limit 3;
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a b
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NULL 9
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NULL 9
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select * from t1 where (a is null or a = 7) and b=7;
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a b
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7 7
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NULL 7
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select * from t1 where a is null and b=9 or a is null and b=7 limit 3;
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a b
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NULL 7
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NULL 9
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NULL 9
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select * from t1 where a > 1 and a < 3 limit 1;
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a b
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2 2
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select * from t1 where a > 8 and a < 9;
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a b
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create table t2 like t1;
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insert into t2 select * from t1;
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alter table t1 modify b blob not null, add c int not null, drop key a, add unique key (a,b(20),c), drop key b, add key (b(10));
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explain select * from t1 where a is null and b = 2;
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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,b a 5 const 3 Using where
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explain select * from t1 where a is null and b = 2 and c=0;
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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,b a 5 const 3 Using where
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explain select * from t1 where a is null and b = 7 and c=0;
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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,b a 5 const 3 Using where
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explain select * from t1 where a=2 and b = 2;
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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,b a 5 const 1 Using where
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explain select * from t1 where a<=>b limit 2;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ALL NULL NULL NULL NULL 12 Using where
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explain select * from t1 where (a is null or a > 0 and a < 3) and b < 5 and c=0 limit 3;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 range a,b a 5 NULL 5 Using where
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explain select * from t1 where (a is null or a = 7) and b=7 and c=0;
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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_or_null a,b a 5 const 4 Using where
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explain select * from t1 where (a is null and b>a) or a is null and b=7 limit 2;
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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,b a 5 const 3 Using where
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explain select * from t1 where a is null and b=9 or a is null and b=7 limit 3;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ref a,b a 5 const 3 Using where
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explain select * from t1 where a > 1 and a < 3 limit 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 range a a 5 NULL 1 Using where
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explain select * from t1 where a is null and b=7 or a > 1 and a < 3 limit 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 range a,b a 5 NULL 4 Using where
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explain select * from t1 where a > 8 and a < 9;
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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 1 Using where
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explain select * from t1 where b like "6%";
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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 b b 12 NULL 1 Using where
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select * from t1 where a is null;
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a b c
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NULL 7 0
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NULL 9 0
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NULL 9 0
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select * from t1 where a is null and b = 7 and c=0;
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a b c
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NULL 7 0
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select * from t1 where a<=>b limit 2;
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a b c
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1 1 0
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2 2 0
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select * from t1 where (a is null or a > 0 and a < 3) and b < 5 limit 3;
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a b c
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1 1 0
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2 2 0
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select * from t1 where (a is null or a > 0 and a < 3) and b > 7 limit 3;
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a b c
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NULL 9 0
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NULL 9 0
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select * from t1 where (a is null or a = 7) and b=7 and c=0;
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a b c
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7 7 0
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NULL 7 0
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select * from t1 where a is null and b=9 or a is null and b=7 limit 3;
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a b c
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NULL 7 0
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NULL 9 0
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NULL 9 0
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select * from t1 where b like "6%";
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a b c
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6 6 0
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drop table t1;
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rename table t2 to t1;
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alter table t1 modify b int null;
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insert into t1 values (7,null), (8,null), (8,7);
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explain select * from t1 where a = 7 and (b=7 or 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_or_null a,b a 10 const,const 2 Using where; Using index
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select * from t1 where a = 7 and (b=7 or b is null);
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a b
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7 7
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7 NULL
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explain select * from t1 where (a = 7 or a is null) and (b=7 or 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_or_null a,b a 5 const 5 Using where; Using index
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select * from t1 where (a = 7 or a is null) and (b=7 or b is null);
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a b
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7 NULL
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7 7
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NULL 7
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explain select * from t1 where (a = 7 or a is null) and (a = 7 or 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_or_null a a 5 const 5 Using where; Using index
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select * from t1 where (a = 7 or a is null) and (a = 7 or a is null);
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a b
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7 NULL
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7 7
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NULL 7
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NULL 9
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NULL 9
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create table t2 (a int);
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insert into t2 values (7),(8);
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explain select * from t2 straight_join t1 where t1.a=t2.a and 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 t2 ALL NULL NULL NULL NULL 2 Using where
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1 SIMPLE t1 ref a,b a 10 test.t2.a,const 1 Using where; Using index
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drop index b on t1;
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explain select * from t2,t1 where t1.a=t2.a and 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 t2 ALL NULL NULL NULL NULL 2 Using where
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1 SIMPLE t1 ref a a 10 test.t2.a,const 1 Using where; Using index
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select * from t2,t1 where t1.a=t2.a and b is null;
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a a b
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7 7 NULL
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8 8 NULL
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explain select * from t2,t1 where t1.a=t2.a and (b= 7 or 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 t2 ALL NULL NULL NULL NULL 2 Using where
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1 SIMPLE t1 ref_or_null a a 10 test.t2.a,const 5 Using where; Using index
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select * from t2,t1 where t1.a=t2.a and (b= 7 or b is null);
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a a b
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7 7 7
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7 7 NULL
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8 8 7
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8 8 NULL
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explain select * from t2,t1 where (t1.a=t2.a or t1.a is null) and b= 7;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t2 ALL NULL NULL NULL NULL 2
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1 SIMPLE t1 ref_or_null a a 10 test.t2.a,const 5 Using where; Using index
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select * from t2,t1 where (t1.a=t2.a or t1.a is null) and b= 7;
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a a b
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7 7 7
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7 NULL 7
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8 8 7
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8 NULL 7
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explain select * from t2,t1 where (t1.a=t2.a or t1.a is null) and (b= 7 or 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 t2 ALL NULL NULL NULL NULL 2
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1 SIMPLE t1 ref_or_null a a 5 test.t2.a 5 Using where; Using index
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select * from t2,t1 where (t1.a=t2.a or t1.a is null) and (b= 7 or b is null);
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a a b
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7 7 NULL
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7 7 7
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7 NULL 7
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8 8 NULL
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8 8 7
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8 NULL 7
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insert into t2 values (null),(6);
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delete from t1 where a=8;
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explain select * from t2,t1 where t1.a=t2.a or t1.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 t2 ALL NULL NULL NULL NULL 4
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1 SIMPLE t1 ref_or_null a a 5 test.t2.a 4 Using where; Using index
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explain select * from t2,t1 where t1.a<=>t2.a or (t1.a is null and t1.b <> 9);
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t2 ALL NULL NULL NULL NULL 4
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1 SIMPLE t1 ref_or_null a a 5 test.t2.a 4 Using where; Using index
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select * from t2,t1 where t1.a<=>t2.a or (t1.a is null and t1.b <> 9);
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a a b
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7 7 NULL
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7 7 7
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7 NULL 7
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8 NULL 7
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NULL NULL 7
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NULL NULL 9
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NULL NULL 9
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6 6 6
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6 NULL 7
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drop table t1,t2;
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CREATE TABLE t1 (
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id int(10) unsigned NOT NULL auto_increment,
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uniq_id int(10) unsigned default NULL,
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PRIMARY KEY (id),
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UNIQUE KEY idx1 (uniq_id)
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) ENGINE=MyISAM;
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CREATE TABLE t2 (
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id int(10) unsigned NOT NULL auto_increment,
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uniq_id int(10) unsigned default NULL,
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PRIMARY KEY (id)
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) ENGINE=MyISAM;
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INSERT INTO t1 VALUES (1,NULL),(2,NULL),(3,1),(4,2),(5,NULL),(6,NULL),(7,3),(8,4),(9,NULL),(10,NULL);
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INSERT INTO t1 VALUES (11,5),(12,6),(13,7),(14,8),(15,9);
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INSERT INTO t1 VALUES (1000,1000),(1010,1010);
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INSERT INTO t2 VALUES (1,NULL),(2,NULL),(3,1),(4,2),(5,NULL),(6,NULL),(7,3),(8,4),(9,NULL),(10,NULL);
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explain select id from t1 where uniq_id 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 idx1 idx1 5 const 6 Using index condition
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explain select id from t1 where uniq_id =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 const idx1 idx1 5 const 1
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UPDATE t1 SET id=id+100 where uniq_id is null;
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UPDATE t2 SET id=id+100 where uniq_id is null;
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select id from t1 where uniq_id is null;
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id
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101
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102
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105
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106
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109
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110
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select id from t2 where uniq_id is null;
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id
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101
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102
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105
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106
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109
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110
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DELETE FROM t1 WHERE uniq_id IS NULL;
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DELETE FROM t2 WHERE uniq_id IS NULL;
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DELETE FROM t1 WHERE id >= 1000;
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SELECT * FROM t1 ORDER BY uniq_id, id;
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id uniq_id
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3 1
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4 2
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7 3
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8 4
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11 5
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12 6
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13 7
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14 8
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15 9
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SELECT * FROM t2 ORDER BY uniq_id, id;
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id uniq_id
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3 1
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4 2
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7 3
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8 4
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DROP table t1,t2;
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CREATE TABLE `t1` (
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`order_id` char(32) NOT NULL default '',
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`product_id` char(32) NOT NULL default '',
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`product_type` int(11) NOT NULL default '0',
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PRIMARY KEY (`order_id`,`product_id`,`product_type`)
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) ENGINE=MyISAM;
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CREATE TABLE `t2` (
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`order_id` char(32) NOT NULL default '',
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`product_id` char(32) NOT NULL default '',
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`product_type` int(11) NOT NULL default '0',
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PRIMARY KEY (`order_id`,`product_id`,`product_type`)
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) ENGINE=MyISAM;
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INSERT INTO t1 (order_id, product_id, product_type) VALUES
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('3d7ce39b5d4b3e3d22aaafe9b633de51',1206029, 3),
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('3d7ce39b5d4b3e3d22aaafe9b633de51',5880836, 3),
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('9d9aad7764b5b2c53004348ef8d34500',2315652, 3);
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INSERT INTO t2 (order_id, product_id, product_type) VALUES
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('9d9aad7764b5b2c53004348ef8d34500',2315652, 3);
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select t1.* from t1
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left join t2 using(order_id, product_id, product_type)
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where t2.order_id=NULL;
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order_id product_id product_type
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select t1.* from t1
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left join t2 using(order_id, product_id, product_type)
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where t2.order_id is NULL;
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order_id product_id product_type
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3d7ce39b5d4b3e3d22aaafe9b633de51 1206029 3
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3d7ce39b5d4b3e3d22aaafe9b633de51 5880836 3
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drop table t1,t2;
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create table t1 (id int);
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insert into t1 values (null), (0);
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create table t2 (id int);
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insert into t2 values (null);
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select * from t1, t2 where t1.id = t2.id;
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id id
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alter table t1 add key id (id);
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select * from t1, t2 where t1.id = t2.id;
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id id
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drop table t1,t2;
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create table t1 (
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id integer,
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id2 integer not null,
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index (id),
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index (id2)
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);
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insert ignore into t1 values(null,null),(1,1);
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Warnings:
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Warning 1048 Column 'id2' cannot be null
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select * from t1;
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id id2
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NULL 0
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1 1
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select * from t1 where id <=> null;
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id id2
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NULL 0
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select * from t1 where id <=> null or id > 0;
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id id2
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NULL 0
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1 1
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select * from t1 where id is null or id > 0;
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id id2
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NULL 0
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1 1
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select * from t1 where id2 <=> null or id2 > 0;
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id id2
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1 1
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select * from t1 where id2 is null or id2 > 0;
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id id2
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1 1
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delete from t1 where id <=> NULL;
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select * from t1;
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id id2
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1 1
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drop table t1;
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CREATE TABLE t1 (a int);
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CREATE TABLE t2 (a int, b int, INDEX idx(a));
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CREATE TABLE t3 (b int, INDEX idx(b));
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CREATE TABLE t4 (b int, INDEX idx(b));
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INSERT INTO t1 VALUES (1), (2), (3), (4);
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INSERT INTO t2 VALUES (1, 1), (3, 1);
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INSERT INTO t3 VALUES
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(NULL), (NULL), (NULL), (NULL), (NULL),
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|
(NULL), (NULL), (NULL), (NULL), (NULL);
|
|
INSERT INTO t4 SELECT * FROM t3;
|
|
INSERT INTO t3 SELECT * FROM t4;
|
|
INSERT INTO t4 SELECT * FROM t3;
|
|
INSERT INTO t3 SELECT * FROM t4;
|
|
INSERT INTO t4 SELECT * FROM t3;
|
|
INSERT INTO t3 SELECT * FROM t4;
|
|
INSERT INTO t4 SELECT * FROM t3;
|
|
INSERT INTO t3 SELECT * FROM t4;
|
|
INSERT INTO t4 SELECT * FROM t3;
|
|
INSERT INTO t3 SELECT * FROM t4;
|
|
INSERT INTO t4 SELECT * FROM t3;
|
|
INSERT INTO t3 SELECT * FROM t4;
|
|
INSERT INTO t4 SELECT * FROM t3;
|
|
INSERT INTO t3 SELECT * FROM t4;
|
|
INSERT INTO t4 SELECT * FROM t3;
|
|
INSERT INTO t3 SELECT * FROM t4;
|
|
INSERT INTO t3 VALUES (2), (3);
|
|
ANALYZE table t1, t2, t3;
|
|
Table Op Msg_type Msg_text
|
|
test.t1 analyze status Engine-independent statistics collected
|
|
test.t1 analyze status OK
|
|
test.t2 analyze status Engine-independent statistics collected
|
|
test.t2 analyze status OK
|
|
test.t3 analyze status Engine-independent statistics collected
|
|
test.t3 analyze status OK
|
|
SELECT COUNT(*) FROM t3;
|
|
COUNT(*)
|
|
15972
|
|
EXPLAIN SELECT SQL_CALC_FOUND_ROWS * FROM t1 LEFT JOIN t2 ON t1.a=t2.a
|
|
LEFT JOIN t3 ON t2.b=t3.b;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t1 ALL NULL NULL NULL NULL 4
|
|
1 SIMPLE t2 ref idx idx 5 test.t1.a 1 Using where
|
|
1 SIMPLE t3 ref idx idx 5 test.t2.b 1 Using where; Using index
|
|
FLUSH STATUS ;
|
|
SELECT SQL_CALC_FOUND_ROWS * FROM t1 LEFT JOIN t2 ON t1.a=t2.a
|
|
LEFT JOIN t3 ON t2.b=t3.b;
|
|
a a b b
|
|
1 1 1 NULL
|
|
2 NULL NULL NULL
|
|
3 3 1 NULL
|
|
4 NULL NULL NULL
|
|
SELECT FOUND_ROWS();
|
|
FOUND_ROWS()
|
|
4
|
|
SHOW STATUS LIKE "handler_read%";
|
|
Variable_name Value
|
|
Handler_read_first 0
|
|
Handler_read_key 6
|
|
Handler_read_last 0
|
|
Handler_read_next 2
|
|
Handler_read_prev 0
|
|
Handler_read_retry 0
|
|
Handler_read_rnd 0
|
|
Handler_read_rnd_deleted 0
|
|
Handler_read_rnd_next 5
|
|
DROP TABLE t1,t2,t3,t4;
|
|
CREATE TABLE t1 (
|
|
a int(11) default NULL,
|
|
b int(11) default NULL,
|
|
KEY a (a,b)
|
|
);
|
|
INSERT INTO t1 VALUES (0,10),(0,11),(0,12);
|
|
CREATE TABLE t2 (
|
|
a int(11) default NULL,
|
|
b int(11) default NULL,
|
|
KEY a (a)
|
|
);
|
|
INSERT INTO t2 VALUES (3,NULL),(3,11),(3,12);
|
|
SELECT * FROM t2 inner join t1 WHERE ( t1.a = 0 OR t1.a IS NULL) AND t2.a = 3 AND t2.b = t1.b;
|
|
a b a b
|
|
3 11 0 11
|
|
3 12 0 12
|
|
drop table t1, t2;
|
|
End of 5.0 tests
|
|
#
|
|
# BUG#727667 Wrong result with OR + NOT NULL in maria-5.3
|
|
#
|
|
CREATE TABLE t1 (
|
|
f3 int(11),
|
|
f10 varchar(1),
|
|
KEY (f3)
|
|
);
|
|
INSERT INTO t1 VALUES ('9','k'),(NULL,'r');
|
|
SELECT * FROM t1 WHERE (f3 = 83) OR (f10 = 'z' AND f3 IS NULL);
|
|
f3 f10
|
|
DROP TABLE t1;
|