xndai opened a new pull request #1445: [CALCITE-3330] propagateCostImprovements() could result in stack over… URL: https://github.com/apache/calcite/pull/1445 …flow Current implementation uses depth first approach for propagating cost improvements to parent rel nodes. This could lead to stack overflow if the rel node hierarchy is very deep. Fix this by using breath first approach for cost propagation.
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