Github user liancheng commented on the pull request:

    https://github.com/apache/spark/pull/13270#issuecomment-221137189
  
    @xwu0226 Would you please help review this one? It's based on our 
discussion in your PR (#13120). The benefit of this version is that it avoids 
the bad case mentioned in [this comment][1].
    
    [1]: https://github.com/apache/spark/pull/13120#discussion_r63869408


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