| Bug #79015 | When function DATEDIFF and NULLIF work together, incorrect result is returned | ||
|---|---|---|---|
| Submitted: | 29 Oct 2015 9:03 | Modified: | 29 Oct 2015 9:15 |
| Reporter: | Su Dylan | Email Updates: | |
| Status: | Verified | Impact on me: | |
| Category: | MySQL Server: DML | Severity: | S3 (Non-critical) |
| Version: | 5.7.8, 5.6.27, 5.6.28, 5.7.9 | OS: | Any |
| Assigned to: | CPU Architecture: | Any | |
| Tags: | regression | ||
[29 Oct 2015 9:15]
MySQL Verification Team
Hello Su Dylan, Thank you for the report and test case. Observed that 5.6/5.7 latest builds are affected. Thanks, Umesh
[29 Oct 2015 9:16]
MySQL Verification Team
// 5.6.27, 5.6.28, 5.7.9 affected
[root@cluster-repo ~]# mysql -uroot
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 44
Server version: 5.6.27 MySQL Community Server (GPL)
Copyright (c) 2000, 2015, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql> select DATEDIFF( '2015-01-02 01:01:01', NULLIF('2015-01-01 01:01:01', '1999-01-01 01:01:01')), NULLIF('2015-01-01 01:01:01', '1999-01-01 01:01:01');
+----------------------------------------------------------------------------------------+------------------------------------------------------+
| DATEDIFF( '2015-01-02 01:01:01', NULLIF('2015-01-01 01:01:01', '1999-01-01 01:01:01')) | NULLIF('2015-01-01 01:01:01', '1999-01-01 01:01:01') |
+----------------------------------------------------------------------------------------+------------------------------------------------------+
| NULL | 2015-01-01 01:01:01 |
+----------------------------------------------------------------------------------------+------------------------------------------------------+
1 row in set, 2 warnings (0.00 sec)
mysql> select DATEDIFF( '2015-01-02 01:01:01', '2015-01-01 01:01:01');
+---------------------------------------------------------+
| DATEDIFF( '2015-01-02 01:01:01', '2015-01-01 01:01:01') |
+---------------------------------------------------------+
| 1 |
+---------------------------------------------------------+
1 row in set (0.00 sec)
// 5.6.28
[umshastr@hod03]/export/umesh/server/binaries/mysql-advanced-5.6.28: bin/mysql -uroot -S /tmp/mysql_ushastry.sock
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 1
Server version: 5.6.28-enterprise-commercial-advanced MySQL Enterprise Server - Advanced Edition (Commercial)
Copyright (c) 2000, 2015, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql> select DATEDIFF( '2015-01-02 01:01:01', NULLIF('2015-01-01 01:01:01', '1999-01-01 01:01:01')), NULLIF('2015-01-01 01:01:01', '1999-01-01 01:01:01');
+----------------------------------------------------------------------------------------+------------------------------------------------------+
| DATEDIFF( '2015-01-02 01:01:01', NULLIF('2015-01-01 01:01:01', '1999-01-01 01:01:01')) | NULLIF('2015-01-01 01:01:01', '1999-01-01 01:01:01') |
+----------------------------------------------------------------------------------------+------------------------------------------------------+
| NULL | 2015-01-01 01:01:01 |
+----------------------------------------------------------------------------------------+------------------------------------------------------+
1 row in set, 2 warnings (0.00 sec)
mysql> select DATEDIFF( '2015-01-02 01:01:01', '2015-01-01 01:01:01');
+---------------------------------------------------------+
| DATEDIFF( '2015-01-02 01:01:01', '2015-01-01 01:01:01') |
+---------------------------------------------------------+
| 1 |
+---------------------------------------------------------+
1 row in set (0.00 sec)
// 5.7.9
[umshastr@hod03]/export/umesh/server/binaries/mysql-5.7.9: bin/mysql -uroot -S /tmp/mysql_ushastry.sock
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 2
Server version: 5.7.9 MySQL Community Server (GPL)
Copyright (c) 2000, 2015, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql> select DATEDIFF( '2015-01-02 01:01:01', NULLIF('2015-01-01 01:01:01', '1999-01-01 01:01:01')), NULLIF('2015-01-01 01:01:01', '1999-01-01 01:01:01');
+----------------------------------------------------------------------------------------+------------------------------------------------------+
| DATEDIFF( '2015-01-02 01:01:01', NULLIF('2015-01-01 01:01:01', '1999-01-01 01:01:01')) | NULLIF('2015-01-01 01:01:01', '1999-01-01 01:01:01') |
+----------------------------------------------------------------------------------------+------------------------------------------------------+
| NULL | 2015-01-01 01:01:01 |
+----------------------------------------------------------------------------------------+------------------------------------------------------+
1 row in set, 2 warnings (0.00 sec)
mysql> select DATEDIFF( '2015-01-02 01:01:01', '2015-01-01 01:01:01');
+---------------------------------------------------------+
| DATEDIFF( '2015-01-02 01:01:01', '2015-01-01 01:01:01') |
+---------------------------------------------------------+
| 1 |
+---------------------------------------------------------+
1 row in set (0.00 sec)
[29 Oct 2015 9:17]
MySQL Verification Team
// 5.1.77/5.5.47
[umshastr@hod03]/export/umesh/server/binaries/mysql-5.1.77: bin/mysql -uroot -S /tmp/mysql_ushastry.sock
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 1
Server version: 5.1.77 Source distribution
Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql> select DATEDIFF( '2015-01-02 01:01:01', NULLIF('2015-01-01 01:01:01', '1999-01-01 01:01:01')), NULLIF('2015-01-01 01:01:01', '1999-01-01 01:01:01');
+----------------------------------------------------------------------------------------+------------------------------------------------------+
| DATEDIFF( '2015-01-02 01:01:01', NULLIF('2015-01-01 01:01:01', '1999-01-01 01:01:01')) | NULLIF('2015-01-01 01:01:01', '1999-01-01 01:01:01') |
+----------------------------------------------------------------------------------------+------------------------------------------------------+
| 1 | 2015-01-01 01:01:01 |
+----------------------------------------------------------------------------------------+------------------------------------------------------+
1 row in set (0.00 sec)
mysql> select DATEDIFF( '2015-01-02 01:01:01', '2015-01-01 01:01:01');
+---------------------------------------------------------+
| DATEDIFF( '2015-01-02 01:01:01', '2015-01-01 01:01:01') |
+---------------------------------------------------------+
| 1 |
+---------------------------------------------------------+
1 row in set (0.00 sec)
// 5.5.47
[umshastr@hod03]/export/umesh/server/binaries/mysql-5.5.47: bin/mysql -uroot -S /tmp/mysql_ushastry.sock
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 1
Server version: 5.5.47 MySQL Community Server (GPL)
Copyright (c) 2000, 2015, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql> select DATEDIFF( '2015-01-02 01:01:01', NULLIF('2015-01-01 01:01:01', '1999-01-01 01:01:01')), NULLIF('2015-01-01 01:01:01', '1999-01-01 01:01:01');
+----------------------------------------------------------------------------------------+------------------------------------------------------+
| DATEDIFF( '2015-01-02 01:01:01', NULLIF('2015-01-01 01:01:01', '1999-01-01 01:01:01')) | NULLIF('2015-01-01 01:01:01', '1999-01-01 01:01:01') |
+----------------------------------------------------------------------------------------+------------------------------------------------------+
| 1 | 2015-01-01 01:01:01 |
+----------------------------------------------------------------------------------------+------------------------------------------------------+
1 row in set (0.00 sec)
mysql> select DATEDIFF( '2015-01-02 01:01:01', '2015-01-01 01:01:01');
+---------------------------------------------------------+
| DATEDIFF( '2015-01-02 01:01:01', '2015-01-01 01:01:01') |
+---------------------------------------------------------+
| 1 |
+---------------------------------------------------------+
1 row in set (0.00 sec)
Description: Output: ======= mysql> select DATEDIFF( '2015-01-02 01:01:01', NULLIF('2015-01-01 01:01:01', '1999-01-01 01:01:01')), NULLIF('2015-01-01 01:01:01', '1999-01-01 01:01:01'); +----------------------------------------------------------------------------------------+------------------------------------------------------+ | DATEDIFF( '2015-01-02 01:01:01', NULLIF('2015-01-01 01:01:01', '1999-01-01 01:01:01')) | NULLIF('2015-01-01 01:01:01', '1999-01-01 01:01:01') | +----------------------------------------------------------------------------------------+------------------------------------------------------+ | NULL | 2015-01-01 01:01:01 | +----------------------------------------------------------------------------------------+------------------------------------------------------+ 1 row in set, 2 warnings (0.00 sec) mysql> select DATEDIFF( '2015-01-02 01:01:01', '2015-01-01 01:01:01'); +---------------------------------------------------------+ | DATEDIFF( '2015-01-02 01:01:01', '2015-01-01 01:01:01') | +---------------------------------------------------------+ | 1 | +---------------------------------------------------------+ 1 row in set (0.00 sec) mysql> select version(); +-----------+ | version() | +-----------+ | 5.7.8-rc | +-----------+ 1 row in set (0.00 sec) Problem: ======== The following sql is expected to return 1: select DATEDIFF( '2015-01-02 01:01:01', NULLIF('2015-01-01 01:01:01', '1999-01-01 01:01:01')) How to repeat: select DATEDIFF( '2015-01-02 01:01:01', NULLIF('2015-01-01 01:01:01', '1999-01-01 01:01:01')), NULLIF('2015-01-01 01:01:01', '1999-01-01 01:01:01'); select DATEDIFF( '2015-01-02 01:01:01', '2015-01-01 01:01:01'); Suggested fix: The following sql returns 1: select DATEDIFF( '2015-01-02 01:01:01', NULLIF('2015-01-01 01:01:01', '1999-01-01 01:01:01'))