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Fixed bug #21698: erroneously a field could be replaced by an

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equal constant under any circumstances.
In fact this substitution can be allowed if the field is
not of a type string or if the field reference serves as 
an argument of a comparison predicate.
This commit is contained in:
igor@rurik.mysql.com
2006-09-07 11:06:37 -07:00
parent ca3229dc1b
commit 34206c6f80
10 changed files with 247 additions and 24 deletions
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2
mysql-test/r/heap_hash.result
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@@ -354,7 +354,7 @@ t3 1 a 2 b NULL 13 NULL NULL HASH
explain select * from t1 ignore key(btree_idx), t3 where t1.name='matt' and t3.a = concat('',t1.name) and t3.b=t1.name;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref heap_idx heap_idx 22 const 7 Using where
1 SIMPLE t3 ref a a 44 const,const 7 Using where
1 SIMPLE t3 ref a a 44 func,const 7 Using where
drop table t1, t2, t3;
create temporary table t1 ( a int, index (a) ) engine=memory;
insert into t1 values (1),(2),(3),(4),(5);