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https://issues.apache.org/jira/browse/CALCITE-1312?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15373441#comment-15373441
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MinJi Kim commented on CALCITE-1312:
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Thanks for the review. I made the changes you suggested. Also, while adding
the tests to SqlOperatorBaseTest, I noticed a few other problems (especially in
timestampdiff with null dates). So, I also made those fixes in this patch. I
also updated the jira.
> timestamp_add(UNIT, DATE) should return timestamp if the unit added is less
> than a date, timestamp_diff should handle null dates
> --------------------------------------------------------------------------------------------------------------------------------
>
> 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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