Github user gatorsmile commented on the issue:
https://github.com/apache/spark/pull/17831
In Scala API, we have five different ways to register UDFs. We have to be
more careful when changing the external APIs. It makes the users confused if we
make the APIs more diverse. I do not suggest to make any further change in
Python UDF, until we figure out how to make us easy to add more UDF types.
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