Xiening Dai created CALCITE-3330:
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Summary: propagateCostImprovements() could result in stack overflow
Key: CALCITE-3330
URL: https://issues.apache.org/jira/browse/CALCITE-3330
Project: Calcite
Issue Type: Bug
Reporter: Xiening Dai
Assignee: Xiening Dai
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. Suggest use breath first approach for cost
propagation.
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