Bug #57018 Incorrect result when using BETWEEN comparison on an indexed DATETIME column.

• Submitted: 25 Sep 2010 15:32
• Modified: 25 Sep 2010 15:59
• Reporter: John Brown
• Status: Verified
• Category: MySQL Server: Data Types
• Severity: S3 (Non-critical)
• Version: 5.1.49, 5.1.52-bzr
• OS: Any
• CPU Architecture: Any
• Tags: between, datetime, INDEX

[25 Sep 2010 15:32] John Brown

Description:
Incorrect result when using BETWEEN comparison on an indexed DATETIME column.

How to repeat:
CREATE TABLE games
(
  id SMALLINT UNSIGNED NOT NULL AUTO_INCREMENT,
  start DATETIME NOT NULL DEFAULT '0000-00-00 00:00:00',
  PRIMARY KEY (id),
  KEY ind_start (start)
);

INSERT INTO games VALUES
(0, '2010-10-01 16:00:00'),
(0, '2010-10-01 17:00:00'),
(0, '2010-10-01 18:00:00');

incorrect result:

SELECT *
FROM games
WHERE start BETWEEN SUBTIME('2010-10-01 17:00:00', '00:30:00')
                AND ADDTIME('2010-10-01 17:00:00', '00:30:00');

correct result when the ind_start index is deleted or not used:

SELECT *
FROM games IGNORE INDEX (ind_start)
WHERE start BETWEEN SUBTIME('2010-10-01 17:00:00', '00:30:00')
                AND ADDTIME('2010-10-01 17:00:00', '00:30:00');

Suggested fix:
Fix the incorrect behavior when using a datetime column index.

[25 Sep 2010 15:59] Valeriy Kravchuk

Thank you for the bug report. Verified as described with current mysql-5.1 from bzr:

macbook-pro:5.1 openxs$ bin/mysql -uroot test
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 2
Server version: 5.1.52-debug Source distribution

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This software comes with ABSOLUTELY NO WARRANTY. This is free software,
and you are welcome to modify and redistribute it under the GPL v2 license

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql> CREATE TABLE games
    -> (
    ->   id SMALLINT UNSIGNED NOT NULL AUTO_INCREMENT,
    ->   start DATETIME NOT NULL DEFAULT '0000-00-00 00:00:00',
    ->   PRIMARY KEY (id),
    ->   KEY ind_start (start)
    -> );
Query OK, 0 rows affected (0.07 sec)

mysql> 
mysql> INSERT INTO games VALUES
    -> (0, '2010-10-01 16:00:00'),
    -> (0, '2010-10-01 17:00:00'),
    -> (0, '2010-10-01 18:00:00');
Query OK, 3 rows affected (0.00 sec)
Records: 3  Duplicates: 0  Warnings: 0

mysql> SELECT *
    -> FROM games
    -> WHERE start BETWEEN SUBTIME('2010-10-01 17:00:00', '00:30:00')
    ->                 AND ADDTIME('2010-10-01 17:00:00', '00:30:00');
Empty set (0.04 sec)

mysql> SELECT *
    -> FROM games IGNORE INDEX (ind_start)
    -> WHERE start BETWEEN SUBTIME('2010-10-01 17:00:00', '00:30:00')
    ->                 AND ADDTIME('2010-10-01 17:00:00', '00:30:00');
+----+---------------------+
| id | start               |
+----+---------------------+
|  2 | 2010-10-01 17:00:00 |
+----+---------------------+
1 row in set (0.36 sec)