[ 
https://issues.apache.org/jira/browse/CALCITE-1639?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

hongbin ma updated CALCITE-1639:
--------------------------------
    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:
{noformat}
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> 
{noformat}

  was:
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> 



> issue for timestampadd month
> ----------------------------
>
>                 Key: CALCITE-1639
>                 URL: https://issues.apache.org/jira/browse/CALCITE-1639
>             Project: Calcite
>          Issue Type: Bug
>            Reporter: hongbin ma
>            Assignee: Julian Hyde
>
> 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:
> {noformat}
> 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> 
> {noformat}



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