Github user tdas commented on the pull request:

    https://github.com/apache/spark/pull/7185#issuecomment-118992583
  
    This wrapper problem has always been a problem with the Python API. All 
these wrapper magic allow us to the provide the almost similar semantics and 
API in Python as that in Java, which is what is the ultimate goal. This wrapper 
magic comes with the wrapper hell, which we have considered as a necessary, 
unavoidable evil in order to achieve the final goal.


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