viirya commented on issue #24960: [SPARK-28156][SQL] Self-join should not miss cached view URL: https://github.com/apache/spark/pull/24960#issuecomment-506655263 A project node just aliasing child's output in same output order, looks like can be a candidate to be removed in canonicalized query plan. But we should be careful about `QueryPlan.sameResult`. Not sure if any corner cases I'm not aware of. If removing a project node like that is safe when canonicalization, #24236 and this issue should be fine.
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