ueshin opened a new pull request #24236: [SPARK-27314][SQL] Deduplicate exprIds for Union. URL: https://github.com/apache/spark/pull/24236 ## What changes were proposed in this pull request? We have been having a potential problem with `Union` when the children have the same expression id in their outputs, which happens when self-union. ## How was this patch tested? Modified some tests to adjust plan changes.
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