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https://issues.apache.org/jira/browse/HIVE-9690?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14321723#comment-14321723
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Jason Dere commented on HIVE-9690:
----------------------------------
Looks like RexNodeConverter (used for passing the parsed query to Calcite) is
using the UDF class to make some assumptions about the UDF return type, which
might be what is causing the test failures. There is probably a better way to
get this information.
> Refactoring for non-numeric arithmetic operations
> -------------------------------------------------
>
> Key: HIVE-9690
> URL: https://issues.apache.org/jira/browse/HIVE-9690
> Project: Hive
> Issue Type: Bug
> Components: UDF
> Reporter: Jason Dere
> Assignee: Jason Dere
> Attachments: HIVE-9690.1.patch
>
>
> Some refactoring for HIVE-5021. The current arithmetic UDFs are specialized
> for numeric types, and trying to change the logic in the existing UDFs looks
> a bit complicated. A less intrusive fix would be to create the
> date-time/interval arithmetic UDFs as a separate UDF class, and to make the
> plus/minus UDFs act as a wrapper which would invoke the numeric or interval
> arithmetic UDF depending on the args.
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