Github user yhuai commented on the pull request:
https://github.com/apache/spark/pull/8840#issuecomment-153419110
@rxin I think it is find to not backport it. Without this, a user will get
the DataFrame and when he/she queries it, it will fail (and the error message
does not say what's the cause). Since, it does not really let users make any
real progress, I think we do not really need to backport it.
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