zabetak opened a new pull request #1092: [CALCITE-2899] Deprecate RelTraitPropagationVisitor and remove its usages URL: https://github.com/apache/calcite/pull/1092 The class is deprecated for the following reasons: 1. The contract and behavior of RelTraitPropagationVisitor are not consistent. 2. It traverses RelNode subtrees after every rule transformation affecting performance. 3. It exists only for debugging purposes and we have no proof that helps discover issues. 4. It not modified for the past five years. 5. It is unlikely to be used in the future.
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