Github user JoshRosen commented on the pull request:

    https://github.com/apache/spark/pull/2853#issuecomment-65723651
  
    Just noticed this old PR while trying to clear the PR review backlog.  This 
seems like a good change and I left a couple of comments on how we could avoid 
introducing mutability.  If you have a chance to update this, that would be 
great; otherwise, just comment to let me know if you don't have time to do it 
and I can take care of these fixes myself.  Thanks!


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