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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