Github user HyukjinKwon commented on the issue:
https://github.com/apache/spark/pull/18865
Yea, it is and that's what we discussed -
https://github.com/apache/spark/pull/18865#discussion_r131887972. In that way,
I was thinking
https://github.com/apache/spark/pull/18865#issuecomment-326858521 case could
make sense as no columns are selected.
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