Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/6444#issuecomment-118238046
There may be a corner-case when encoding NaN values with different
bitpatterns into UnsafeRow, since these NaNs won't be identical (see comment at
https://github.com/apache/spark/pull/7176#discussion_r33807115). This is not a
big deal _yet_, since we currently don't have defined semantics for sorting on
columns containing NaN, but we should remember to investigate this if we try to
fix NaN sorting.
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