Github user adrian-wang commented on the pull request:
https://github.com/apache/spark/pull/2344#issuecomment-56018809
Though Hive would throw exception when cast int to date, I think it doesn't
matter if not obey, because query exit with exception is considered a failure
in `runHive`. Let's keep cast int to date as null, exactly as what hive does
with cast string to int.
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