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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