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WL#2985 "Partition Pruning":

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- post-...-post review fixes
- Added "integer range walking" that allows to do partition pruning for "a <=? t.field <=? b"
  by finding used partitions for a, a+1, a+2, ..., b-1, b.
This commit is contained in:
sergefp@mysql.com
2006-01-04 11:09:01 +03:00
parent f2d603c245
commit 93669bfe0b
7 changed files with 769 additions and 186 deletions
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30
mysql-test/r/partition_pruning.result
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@ -274,3 +274,33 @@ id select_type table partitions type possible_keys key key_len ref rows Extra
1 SIMPLE X p1,p2 ALL a NULL NULL NULL 4 Using where
1 SIMPLE Y p1,p2 ref a a 4 test.X.a 2
drop table t1;
create table t1 (a int) partition by hash(a) partitions 20;
insert into t1 values (1),(2),(3);
explain partitions select * from t1 where a > 1 and a < 3;
id select_type table partitions type possible_keys key key_len ref rows Extra
1 SIMPLE t1 p2 ALL NULL NULL NULL NULL 3 Using where
explain partitions select * from t1 where a >= 1 and a < 3;
id select_type table partitions type possible_keys key key_len ref rows Extra
1 SIMPLE t1 p1,p2 ALL NULL NULL NULL NULL 3 Using where
explain partitions select * from t1 where a > 1 and a <= 3;
id select_type table partitions type possible_keys key key_len ref rows Extra
1 SIMPLE t1 p2,p3 ALL NULL NULL NULL NULL 3 Using where
explain partitions select * from t1 where a >= 1 and a <= 3;
id select_type table partitions type possible_keys key key_len ref rows Extra
1 SIMPLE t1 p1,p2,p3 ALL NULL NULL NULL NULL 3 Using where
drop table t1;
create table t1 (a int, b int)
partition by list(a) subpartition by hash(b) subpartitions 20
(
partition p0 values in (0),
partition p1 values in (1),
partition p2 values in (2),
partition p3 values in (3)
);
insert into t1 values (1,1),(2,2),(3,3);
explain partitions select * from t1 where b > 1 and b < 3;
id select_type table partitions type possible_keys key key_len ref rows Extra
1 SIMPLE t1 p0_sp2,p1_sp2,p2_sp2,p3_sp2 ALL NULL NULL NULL NULL 3 Using where
explain partitions select * from t1 where b > 1 and b < 3 and (a =1 or a =2);
id select_type table partitions type possible_keys key key_len ref rows Extra
1 SIMPLE t1 p1_sp2,p2_sp2 ALL NULL NULL NULL NULL 3 Using where