Github user viirya commented on the issue:
https://github.com/apache/spark/pull/13778
@mengxr Although UDTs are private APIs, but as you see from the example,
the users can define user classes and corresponding UDTs in Python that will be
PythonUserDefinedType. The issues in this PR are not rare cases and it is very
possibly PySpark users will hit them during using 2.0.
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