Github user rxin commented on the issue:
https://github.com/apache/spark/pull/18906
I understand why you are using Python. What I don't understand is why you'd
need to annotate nullability, because those are typically annotated for the
purpose of performance improvement, but Python UDFs are already slow and most
performance improvements are probably not going to help you much there.
Can you tell me the case why you care about this?
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