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Fixed a bug in key optimizing handling where the expression

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WHERE column_name = key_column_name was calculated as true
for NULL values.


Docs/manual.texi:
  Changelog
mysql-test/r/distinct.result:
  Updated results caused by bug fix.
mysql-test/r/null_key.result:
  New tests
mysql-test/t/null_key.test:
  New tests
sql/sql_select.cc:
  Additional change for previous changeset for using BLOB in GROUP BY
This commit is contained in:
unknown
2002-10-14 17:04:12 +03:00
parent 61632073ac
commit a86c172f58
6 changed files with 79 additions and 5 deletions
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2
mysql-test/r/distinct.result
View File

@ -128,7 +128,7 @@ a
1
table type possible_keys key key_len ref rows Extra
t1 index PRIMARY PRIMARY 4 NULL 2 Using index; Using temporary
t3 ref a a 5 t1.a 10 Using index; Distinct
t3 ref a a 5 t1.a 10 where used; Using index; Distinct
a
1
2

6
mysql-test/r/null_key.result
View File

@ -120,3 +120,9 @@ id uniq_id
4 2
7 3
8 4
order_id product_id product_type
order_id product_id product_type
3d7ce39b5d4b3e3d22aaafe9b633de51 1206029 3
3d7ce39b5d4b3e3d22aaafe9b633de51 5880836 3
id id
id id

44
mysql-test/t/null_key.test
View File

@ -91,3 +91,47 @@ DELETE FROM t2 WHERE uniq_id IS NULL;
SELECT * FROM t1 ORDER BY uniq_id, id;
SELECT * FROM t2 ORDER BY uniq_id, id;
DROP table t1,t2;
#
# This crashed MySQL 3.23.47
#
CREATE TABLE `t1` (
`order_id` char(32) NOT NULL default '',
`product_id` char(32) NOT NULL default '',
`product_type` int(11) NOT NULL default '0',
PRIMARY KEY (`order_id`,`product_id`,`product_type`)
) TYPE=MyISAM;
CREATE TABLE `t2` (
`order_id` char(32) NOT NULL default '',
`product_id` char(32) NOT NULL default '',
`product_type` int(11) NOT NULL default '0',
PRIMARY KEY (`order_id`,`product_id`,`product_type`)
) TYPE=MyISAM;
INSERT INTO t1 (order_id, product_id, product_type) VALUES
('3d7ce39b5d4b3e3d22aaafe9b633de51',1206029, 3),
('3d7ce39b5d4b3e3d22aaafe9b633de51',5880836, 3),
('9d9aad7764b5b2c53004348ef8d34500',2315652, 3);
INSERT INTO t2 (order_id, product_id, product_type) VALUES
('9d9aad7764b5b2c53004348ef8d34500',2315652, 3);
select t1.* from t1
left join t2 using(order_id, product_id, product_type)
where t2.order_id=NULL;
select t1.* from t1
left join t2 using(order_id, product_id, product_type)
where t2.order_id is NULL;
drop table t1,t2;
#
# The last select returned wrong results in 3.23.52
#
create table t1 (id int);
insert into t1 values (null), (0);
create table t2 (id int);
insert into t2 values (null);
select * from t1, t2 where t1.id = t2.id;
alter table t1 add key id (id);
select * from t1, t2 where t1.id = t2.id;
drop table t1,t2;