Github user cloud-fan commented on the pull request:

    https://github.com/apache/spark/pull/11283#issuecomment-191595032
  
    I prefer to make corrected assumptions and write simple code. If the 
assumption is broken at future, we can fix it at that time. While making 
assumptions, we should write more `assert` so that if the assumptions are 
broken, we can know it at the first place.
    
    cc @liancheng 


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