Github user ptkool commented on the issue:
https://github.com/apache/spark/pull/18906
@rxin We have several large systems with 100s of Spark jobs implemented in
Python and PySpark, and use Python UDFs due to lack of equivalent functionality
in Spark. I understand what your saying re Python UDFs being slow and using
AssertNotNull, but making this kind of change would be a huge effort.
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