Github user dongjoon-hyun commented on the issue:
https://github.com/apache/spark/pull/14580
:) I think about this issue again.
At this stage, could you make a PR for this?
I think you're the best person to do that. You made this optimizer and
found the correct fix.
This was a nice change to investigate this optimizer and nullability
propagation for me.
@gatorsmile . Thank you for reviewing this. I'll close this PR soon.
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