Github user viirya commented on the pull request:

    https://github.com/apache/spark/pull/11647#issuecomment-195302187
  
    I was measuring the time to finish the code snippet shown in pr 
description. But I think I should only measure the time spent on `val actual = 
Optimize.execute(plan)`.
    
    Let me update it:
    
    With this patch:
    
    84362 microseconds
    84075 microseconds
    86192 microseconds
    
    Without this patch:
    
    492139 microseconds
    503386 microseconds
    463162 microseconds



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