Github user liancheng commented on the pull request:

    https://github.com/apache/spark/pull/5714#issuecomment-97352865
  
    @chenghao-intel I agree that this conforms to current `DataFrame`/`RDD` 
semantics and fixes the problem. But I doubt whether this semantics worth 
adding another mutable state.
    
    @rxin What do you think?


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