Github user rxin commented on the issue:
https://github.com/apache/spark/pull/18906
@ptkool have you seen a real use case so far that you need this? I'm a bit
surprised since Python UDFs are already pretty slow, and you'd care about this.
Are there other cases you run into?
One thing we can do is to do a runtime non-null check (insert an
AssertNotNull) when this is annotated with not null.
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