[CALCITE-1639] TIMESTAMPADD(MONTH, ...) should return last day of month if the day overflows

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 1.13.0
• Assignee: Julian Hyde
• Reporter: Hongbin Ma
• Created: 16/Feb/17 08:38
• Updated: 27/Feb/24 22:23
• Resolved: 19/Apr/17 21:08

Description

in calcite,

select timestampadd(MONTH,1,cast('2016-05-31' as timestamp)) will return 2016-07-01 00:00:00, and select timestampadd(MONTH,-1,cast('2016-03-31' as timestamp)) will return 2016-03-01 00:00:00

however in mysql, the last day of the next/previous month is always returned:

mysql> select timestampadd(MONTH,1,'2016-05-31') ;
+------------------------------------+
| timestampadd(MONTH,1,'2016-05-31') |
+------------------------------------+
| 2016-06-30                         |
+------------------------------------+
1 row in set (0.00 sec)

mysql> select timestampadd(MONTH,-1,'2016-03-31') ;
+-------------------------------------+
| timestampadd(MONTH,-1,'2016-03-31') |
+-------------------------------------+
| 2016-02-29                          |
+-------------------------------------+
1 row in set (0.00 sec)

mysql>