Github user wangmiao1981 commented on the issue:

    https://github.com/apache/spark/pull/15421
  
    @shivaram  Thanks for your explanation! I can continue debugging this as 
you pointed and I can constantly reproduce the issue. For this PR, I think it 
is fine for handling the `NA` in the backend except for the unnecessary 
exception handling. I can submit a follow up PR on the serialization part. 


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