xndai commented on issue #1543: [CALCITE-3455] Redundant rule firing for both logical and physical nodes URL: https://github.com/apache/calcite/pull/1543#issuecomment-552992313 @danny0405 had a good feedback - since ProjectMergeRule can also be used by HepPlanner, and in some cases user would use HepPlanner to merge physical project nodes at the end of optimization phase, so I update this change to only disable physical project merge under volcano planer.
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