zabetak commented on issue #552: [CALCITE-2018] Queries failed with AssertionError: rel has lower cost… URL: https://github.com/apache/calcite/pull/552#issuecomment-529391719 Hi @xndai if you have two clusters in the same `RelNode` tree then it sounds like a bug. There are various checks in the VolcanoPlanner to avoid this situation.
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