[jira] [Updated] (CALCITE-1312) Return type of TIMESTAMP_ADD applied to a DATE should be TIMESTAMP if unit is smaller than DAY

["Julian Hyde (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CALCITE-1312?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Julian Hyde updated CALCITE-1312:
---------------------------------
    Summary: Return type of TIMESTAMP_ADD applied to a DATE should be TIMESTAMP if unit is smaller than DAY  (was: timestamp_add(UNIT, DATE) should return timestamp if the unit added is less than a date, timestamp_diff should handle null dates)

> Return type of TIMESTAMP_ADD applied to a DATE should be TIMESTAMP if unit is smaller than DAY
> ----------------------------------------------------------------------------------------------
>
>                 Key: CALCITE-1312
>                 URL: https://issues.apache.org/jira/browse/CALCITE-1312
>             Project: Calcite
>          Issue Type: Bug
>          Components: core
>            Reporter: MinJi Kim
>            Assignee: Julian Hyde
>
> timestamp_add("MINUTE", 1, date '2016-06-15') returns 2016-06-15 since it returns a date and therefore truncates the minute informtion.  timestamp_add should return timestamp instead of date for units less than date.
> timestamp_diff with date doesn't handle null properly (in type inference), converted type is INTEGER NOT NULL (when it should be null).



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