Github user cloud-fan commented on the issue:

    https://github.com/apache/spark/pull/13778
  
    yea, so whatever the data type is(python udt or normal sql type), at java 
side there is no difference, the data is converted to corrected format by 
pickler. That's why I think maybe it's possible to just pass the corresponding 
sql type of python udt to java side.
    
    My only concern is, sometimes we use the schema of java dataframe as the 
schema at python side. If we don't pass python udt to java side, the udt 
information will be lost. @viirya do you mind give it a try? thanks!


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