cloud-fan commented on issue #26441: [SPARK-29682][SQL] Resolve conflicting references in aggregate expressions URL: https://github.com/apache/spark/pull/26441#issuecomment-552298083 It's better to explain why the bug happens in the PR description. I don't understand the current fix, just FYI why we only handle alias in `Project`: The self-join dedup logical tries to find the root which causes conflicts. Sometimes it's alias in `Project`, sometimes it's leaf node. For attributes in `Project`, there must be other nodes under `Project` that cause the conflicts.
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