Details
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Bug
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Status: Closed (View Workflow)
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Major
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Resolution: Fixed
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None
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None
Description
The following test case gives us a wrong result in MariaDB 5.2/5.5
CREATE TABLE t1 (
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pk int NOT NULL,
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col_int_nokey int NOT NULL,
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col_int_key int NOT NULL,
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col_time_key time NOT NULL,
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col_varchar_key varchar(1) NOT NULL,
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col_varchar_nokey varchar(1) NOT NULL,
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PRIMARY KEY (pk),
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KEY col_int_key (col_int_key),
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KEY col_time_key (col_time_key),
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KEY col_varchar_key (col_varchar_key,col_int_key)
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) ENGINE=MyISAM;
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CREATE TABLE t2 (
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pk int NOT NULL AUTO_INCREMENT,
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col_int_nokey int NOT NULL,
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col_int_key int NOT NULL,
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col_time_key time NOT NULL,
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col_varchar_key varchar(1) NOT NULL,
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col_varchar_nokey varchar(1) NOT NULL,
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PRIMARY KEY (pk),
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KEY col_int_key (col_int_key),
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KEY col_time_key (col_time_key),
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KEY col_varchar_key (col_varchar_key,col_int_key)
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) ENGINE=MyISAM;
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INSERT INTO t2 VALUES (1,4,4,'00:00:00','b','b');
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SET @var2:=4, @var3:=8;
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MariaDB [test]> SELECT * FROM ( SELECT @var3:=12, sq4_alias1.* FROM t1 AS sq4_alias1 WHERE (sq4_alias1.col_varchar_key + NULL) IS NULL OR sq4_alias1.col_varchar_key = @var3 ) AS alias3;
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+-----------+----+---------------+-------------+--------------+-----------------+-------------------+
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| @var3:=12 | pk | col_int_nokey | col_int_key | col_time_key | col_varchar_key | col_varchar_nokey |
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+-----------+----+---------------+-------------+--------------+-----------------+-------------------+
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| 12 | 0 | 0 | 0 | 00:00:00 | | |
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+-----------+----+---------------+-------------+--------------+-----------------+-------------------+
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No rows are expected in the result here.
(see also bug #13651000 from mysql-trunk)