Github user tdas commented on the pull request:
https://github.com/apache/spark/pull/8237#issuecomment-132087668
I understand and I have debated about this before. This is one of those
grey areas where there is no golden solution. In such cases, I think it is
better to err towards having a solution better understandable semantics with
slight inefficiency as opposed to having the most efficient solution without an
hard-to-reason semantics.
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