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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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8
mysql-test/r/heap.result
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@ -379,10 +379,10 @@ id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL v NULL NULL NULL 271 Using where
explain select count(*) from t1 where v between 'a' and 'a ';
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL v NULL NULL NULL 271 Using where
1 SIMPLE t1 ref v v 13 const 10 Using where
explain select count(*) from t1 where v between 'a' and 'a ' and v between 'a ' and 'b\n';
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL v NULL NULL NULL 271 Using where
1 SIMPLE t1 ref v v 13 const 10 Using where
alter table t1 add unique(v);
ERROR 23000: Duplicate entry '{ ' for key 1
select concat('*',v,'*',c,'*',t,'*') as qq from t1 where v='a' order by length(concat('*',v,'*',c,'*',t,'*'));
@ -602,10 +602,10 @@ id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range v v 13 NULL # Using where
explain select count(*) from t1 where v between 'a' and 'a ';
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range v v 13 NULL # Using where
1 SIMPLE t1 ref v v 13 const # Using where
explain select count(*) from t1 where v between 'a' and 'a ' and v between 'a ' and 'b\n';
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range v v 13 NULL # Using where
1 SIMPLE t1 ref v v 13 const # Using where
alter table t1 add unique(v);
ERROR 23000: Duplicate entry '{ ' for key 1
select concat('*',v,'*',c,'*',t,'*') as qq from t1 where v='a' order by length(concat('*',v,'*',c,'*',t,'*'));