hsyuan opened a new pull request #1773: [CALCITE-3756] RelSubset should not match operand(RelNode.class) URL: https://github.com/apache/calcite/pull/1773 Even RelSubset is a subclass of RelNode, but they are quite different. RelNode already fires these rules, it is not necessary to fire for RelSubset. More importantly, it never worked due to CALCITE-3755. In addition, it will waste time to try to iterate class operands of RelSubset and try to match pattern operand(RelNode), given that it never matches when ascending.
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