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https://issues.apache.org/jira/browse/CALCITE-7146?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18016860#comment-18016860
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Mihai Budiu commented on CALCITE-7146:
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I think the most sensible way to treat DATE - TIME (or vice-versa) is to
(implicitly) cast the DATE to TIMESTAMP and then perform the arithmetic. This
is probably what most users would expect. I will provide an implementation
which does that.
> TIMESTAMPDIFF accepts arguments with mismatched types
> -----------------------------------------------------
>
> Key: CALCITE-7146
> URL: https://issues.apache.org/jira/browse/CALCITE-7146
> Project: Calcite
> Issue Type: Bug
> Components: core
> Affects Versions: 1.40.0
> Reporter: Mihai Budiu
> Assignee: Mihai Budiu
> Priority: Minor
>
> Calcite will typecheck this:
> {code:sql}
> SELECT TIMESTAMPDIFF(DAY, DATE '2020-01-01', TIME '10:00:00')
> {code}
> and reduce it to 36000000 - 18262, subtracting days from milliseconds.
> One solution would be to reject arithmetic between DATE and TIME. Another
> solution would be to treat this by casting both to TIMESTAMP. Of course, the
> semantics of casting a TIME to TIMESTAMP is also not clearly defined -
> currently Calcite seems to use Unix EPOCH for the DATE in such casts.
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