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join_outer.result, null.result, null.test, item_cmpfunc.h:

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Fixed inconsistency of values of used_tables_cache and
  const_item_cache for Item_func_isnull objects (bug #1990).
This commit is contained in:
igor@rurik.mysql.com
2003-12-01 13:59:09 -08:00
parent f266cdabab
commit dcbbbe6b94
4 changed files with 24 additions and 1 deletions
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11
mysql-test/t/null.test
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@@ -86,3 +86,14 @@ INSERT INTO t1 (d) values (null),(null);
select * from t1;
drop table t1;
#
# Test to check elimination of IS NULL predicate for a non-nullable attribute
# (bug #1990)
#
create table t1 (a int not null, b int not null, index idx(a));
insert into t1 values
(1,1), (2,2), (3,3), (4,4), (5,5), (6,6),
(7,7), (8,8), (9,9), (10,10), (11,11), (12,12);
explain select * from t1 where a between 2 and 3;
explain select * from t1 where a between 2 and 3 or b is null;
drop table t1;