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https://issues.apache.org/jira/browse/CALCITE-3330?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ASF GitHub Bot updated CALCITE-3330:
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    Labels: pull-request-available  (was: )

> 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
>            Priority: Major
>              Labels: pull-request-available
>
> 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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