Github user gatorsmile commented on the issue:

    https://github.com/apache/spark/pull/21372
  
    A few basic questions about this upgrade. 
    
    What are the benefits of these nine trivial patches? If no impact on Spark 
users, we should not upgrade it; if the new release fixes the bug, we need to 
add the test cases to verify the fix. Please prove the necessity of the 
upgrade. 


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