Github user ptkool commented on the issue:
https://github.com/apache/spark/pull/18906
@rxin
This PR isn't about performance at all. I realize Python UDFs do not
perform well and I also realize annotating Python UDFs with nullability is not
going to make any difference performance-wise.
This PR is about:
* Providing users an avenue to get nullability right.
* Satisfying a use case that I described in my initial comments.
* Consistency between the Python and Scala APIs.
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