cloud-fan commented on issue #25111: [SPARK-28346][SQL] clone the query plan between analyzer, optimizer and planner URL: https://github.com/apache/spark/pull/25111#issuecomment-512655247 @maryannxue AFAIK we don't rely on plan instance equality in Spark. AQE is the only one I'm aware of that needs to check plan instance equality.
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