Github user marmbrus commented on the pull request:
https://github.com/apache/spark/pull/1055#issuecomment-45820167
Thanks for working on this :)
> We should decide whether or not a non-boolean condition is allowed in a
branch of CaseWhen. Hive throws a SemanticException for this situation and I
think it'd be good to mimic it -- the question is where in the whole Spark SQL
pipeline should we signal an exception for such a query.
Yeah, that is invalid and we should throw an error (here an in many other
places). @liancheng is going to work on a framework for reporting analysis
errors eventually, but I don't think that is super high priority at the moment.
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