Github user gatorsmile commented on the pull request:

    https://github.com/apache/spark/pull/10678#issuecomment-172592554
  
    @davies That is fine. : ) I just want to help you make Spark better. 
Updated the PR descriptions. At the beginning, I tried to write simpler code, 
but I finally realized the problem is not simple. Actually, it can be more 
complicated if we also issue the user friendly error messages to explain why 
Analyzer cannot resolve the missing attributes, especially for the `Aggregate` 
operator.
    
    @rxin Yeah. Agree! More reviews are needed for sure. Feel free to let me 
know if any change is needed. 


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