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Fix for BUG#13455: Make "ref" optimizer able to make this inference:

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"t.key BETWEEN c1 AND c2" and c1 = c2 -> can access table t using "t.key = c1".
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sergefp@mysql.com
2005-09-30 01:34:19 +04:00
parent acdc193a45
commit 71d8990f8e
6 changed files with 88 additions and 20 deletions
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25
mysql-test/r/range.result
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@ -1,4 +1,4 @@
drop table if exists t1, t2;
drop table if exists t1, t2, t3;
CREATE TABLE t1 (
event_date date DEFAULT '0000-00-00' NOT NULL,
type int(11) DEFAULT '0' NOT NULL,
@ -787,3 +787,26 @@ id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 range PRIMARY PRIMARY 8 NULL # Using where; Using index
drop view v1;
drop table t1;
create table t3 (a int);
insert into t3 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
create table t1 (a varchar(10), filler char(200), key(a)) charset=binary;
insert into t1 values ('a','');
insert into t1 values ('a ','');
insert into t1 values ('a ', '');
insert into t1 select concat('a', 1000 + A.a + 10 * (B.a + 10 * C.a)), ''
from t3 A, t3 B, t3 C;
create table t2 (a varchar(10), filler char(200), key(a));
insert into t2 select * from t1;
explain select * from t1 where a between 'a' and 'a ';
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range a a 13 NULL # Using where
explain select * from t1 where a = 'a' or a='a ';
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range a a 13 NULL # Using where
explain select * from t2 where a between 'a' and 'a ';
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 ref a a 13 const # Using where
explain select * from t2 where a = 'a' or a='a ';
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 ref a a 13 const # Using where
drop table t1,t2,t3;