Github user bravo-zhang commented on the issue:
https://github.com/apache/spark/pull/16225
@holdenk Thanks for review. I'll combine type(None) in the `isinstance`. I
also made Scala and Python to accept null more generally and in the same way.
PR is reopened at: https://github.com/apache/spark/pull/18820
@gatorsmile please also take a look.
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