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https://issues.apache.org/jira/browse/CALCITE-4747?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jianhui Dong closed CALCITE-4747.
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> Remove outdated graph edges in HepPlanner
> -----------------------------------------
>
> Key: CALCITE-4747
> URL: https://issues.apache.org/jira/browse/CALCITE-4747
> Project: Calcite
> Issue Type: Improvement
> Reporter: Jianhui Dong
> Priority: Minor
> Labels: pull-request-available
> Fix For: 1.28.0
>
> Attachments: image-2021-08-19-12-12-41-534.png
>
> Time Spent: 2h 50m
> Remaining Estimate: 0h
>
> !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 calcite only remove the outdated RelNode(HepRelVertex) in line 970, the edges
> between these vertices are still in the graph, which may cause a memory leak?
> IMO, I think maybe we should also remove the outdated edge.
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