cloud-fan commented on pull request #29493:
URL: https://github.com/apache/spark/pull/29493#issuecomment-678062351


   Sorry guys, I just realized that we already did it 2 years ago: 
https://github.com/apache/spark/pull/22375
   
   I've changed this PR to add document about it, and ask people to explore all 
the null cases when writing tests.


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