Github user andrewor14 commented on the pull request:
https://github.com/apache/spark/pull/13041#issuecomment-218579388
@HyukjinKwon I think we should rename both null and empty strings. In both
cases there's no way to query the column. Also I looked at the other two
patches and although they're related they really don't block this patch. This
patch only touches the header. I think it's OK to merge this one independent of
the other two.
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