Github user viirya commented on the issue:
https://github.com/apache/spark/pull/13778
@cloud-fan I just checked the python UDT. In python side, we will serialize
the python UDT to binary. The python UDT passed to java includes the binary.
Then in python side, in the worker we will deserialize the binary back to
python UDT and use it for sql data serialization.
Because that, I think we can't just pass the sql type of python UDT to java
side. What you think?
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