Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/7194#issuecomment-122465846
Re-opening this after some discussion with @rxin; I'm going to re-work this
so that NaN is treated as the maximum value when sorting. Note that this will
not fix some of the more general correctness issues with NaNs that appear in
grouping keys, etc., but it will at least prevent crashes.
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