Github user viirya commented on the issue:
https://github.com/apache/spark/pull/13778
Python UDT in python side only serializes the python data to sql type
defined in the Python UDT. The problem now is happened at the serialization to
row in java side on the serialized python data. I think it can not be certain
that the serialized python data doesn't need the serialization in java side.
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