xndai commented on issue #552: [CALCITE-2018] Queries failed with AssertionError: rel has lower cost… URL: https://github.com/apache/calcite/pull/552#issuecomment-529320548 Also I notice under debugger that RelNode tree can have more than one RelOptCluster. I haven't dig into that. But if this is the case, your #2 bullet point in your change description may not be true.
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