Github user sryza commented on the pull request:

    https://github.com/apache/spark/pull/4228#issuecomment-71768075
  
    My thinking was just to simplify the API.  I.e. if numLevels is 1, we could 
branch to the old implementation.  I don't have a strong opinion either way, 
but was thinking it could be good to cut down on the proliferation of operators.


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