Github user hhbyyh commented on the issue:

    https://github.com/apache/spark/pull/18902
  
    Thanks for the quick update. The implementation may be improved on some 
details. But first I'd want to confirm the "convert to null" method does not 
have any defect. 
    @MLnick @srowen @yanboliang 
    
    And we may need more unit tests to constantly monitor  the SQL behavior 
(avg and stat) on null. 


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