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https://issues.apache.org/jira/browse/CALCITE-2339?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16495832#comment-16495832
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Julian Hyde commented on CALCITE-2339:
--------------------------------------

I propose that we continue to use interval "+" as the internal representation, 
but writer a converter from an interval "+" expression to a TIMESTAMPADD 
expression that can be used by various dialects in the JDBC adapter.

The only downside I can see is that someone might write {{TIMESTAMPADD(ts, 3, 
WEEK)}} and see {{TIMESTAMPADD(ts, 21, DAY)}} sent to the underlying DB. That's 
not too bad.  The standard intervals day, month, year, hour, second etc will 
not be affected.

> JDBC adapter should transform timestamp arithmetic for target database 
> -----------------------------------------------------------------------
>
>                 Key: CALCITE-2339
>                 URL: https://issues.apache.org/jira/browse/CALCITE-2339
>             Project: Calcite
>          Issue Type: Bug
>            Reporter: Julian Hyde
>            Assignee: Julian Hyde
>            Priority: Major
>         Attachments: Datetime Addition - Calcite.pdf
>
>
> JDBC adapter should transform timestamp arithmetic for target database.
> There are two ways in Calcite to add intervals to timestamps: the 
> TIMESTAMP_ADD function and the "<timestamp> + <interval>" operator.
> The attached document (authored by James Doung) describes their pros and cons.



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