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https://issues.apache.org/jira/browse/CALCITE-2339?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16495824#comment-16495824
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James Duong commented on CALCITE-2339:
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Note that it's possible to represent multi-field intervals with timestampadd.
You just nest multiple timestampadd calls together for each unit. Need to apply
the EXTRACT function to get individual units out of an arbitrary interval
expression though.
> 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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