Github user kayousterhout commented on the pull request:

    https://github.com/apache/spark/pull/3779#issuecomment-72800486
  
    Echoing the comments from @markhamstra and @JoshRosen, this change looks 
correct but is very subtle, so it would be great to improve the commenting 
throughout to avoid confusion for others who read this code later.  I suggested 
a few comment improvements; if you have time to make these soon, that would be 
great since I know you wanted this in for 1.3 and I know the merge window for 
that is closing rapidly.  Thanks @davies!


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