Github user gatorsmile closed the pull request at:
https://github.com/apache/spark/pull/16894
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GitHub user gatorsmile opened a pull request:
https://github.com/apache/spark/pull/16894
[SPARK-17897] [SQL] [BACKPORT-2.0] Fixed IsNotNull Constraint Inference Rule
### What changes were proposed in this pull request?
This PR is to backport
