Github user mallman commented on the pull request:

    https://github.com/apache/spark/pull/10700#issuecomment-172440507
  
    Hi Josh,
    
    Good questions. I may have submitted this PR incorrectly. Perhaps you can 
guide me in the right direction.
    
    I submitted this PR for merging into master because my understanding is 
that's how all PR's for the Spark project should be created. And patches 
against master may be backported to earlier releases. However, I originally 
created and tested this patch on branch-1.5 because that's what we're currently 
running. So while this patch may be irrelevant to master (or Spark 2.0), it's 
relevant to the Spark 1.5 branch and presumably 1.6 as well. Under these 
circumstances, should I have submitted a PR against master as I have done? The 
code contribution guidelines state that only in a special case would a PR be 
opened against another branch. Does a patch with no or lesser relevance to the 
master branch compared to an earlier release branch qualify as a "special 
case"? And if so, which branch should I have submitted the PR against?
    
    Thanks.


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