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https://issues.apache.org/jira/browse/CALCITE-4747?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17403056#comment-17403056
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Stamatis Zampetakis commented on CALCITE-4747:
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[~Lam167] The summary and description are still unclear, as [~nobigo] suggested
please try to rework them.
What is the problem that you encountered? Is it a memory leak? Is it bad
performance? Is it an exception? Your question implies that a certain method
({{collecGarbage}}) does not work as expected but it is not clear why its
current behavior is problematic.
> it seemes that collecGarbage in HepPlanner dose not clean outdated edges?
> -------------------------------------------------------------------------
>
> Key: CALCITE-4747
> URL: https://issues.apache.org/jira/browse/CALCITE-4747
> Project: Calcite
> Issue Type: Improvement
> Reporter: Jianhui Dong
> Priority: Minor
> Attachments: image-2021-08-19-12-12-41-534.png
>
>
> !image-2021-08-19-12-12-41-534.png!
> After we use HepPlanner to optimize the RelNode, we need to replace old
> RelNode with the optimized RelNode, and update the graph in HepPlanner, but
> calcite only remove the outdated RelNode(HepRelVertex) in line 970. I think
> maybe we should also remove the outdated edge.
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