Github user andrewor14 commented on the pull request:
https://github.com/apache/spark/pull/13041#issuecomment-218630138
I talked with @marmbrus and @yhuai offline about the semantics of blank and
empty strings in the header row. For the latter, I can't imagine a user
actually intending to name the column empty string because you can't actually
query the column that way, so we should just rename that.
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