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https://issues.apache.org/jira/browse/CALCITE-1883?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16088379#comment-16088379
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Ted Xu commented on CALCITE-1883:
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[~julianhyde] I've issued a pull request here:
https://github.com/apache/calcite/pull/497
I'm not sure if the fix (leveraging the idea of number of transformations) is
good enough, but you can reproduce the bug from that test case.
> HepPlanner should force garbage collect whenever a root registered
> ------------------------------------------------------------------
>
> Key: CALCITE-1883
> URL: https://issues.apache.org/jira/browse/CALCITE-1883
> Project: Calcite
> Issue Type: Bug
> Reporter: Ted Xu
> Assignee: Julian Hyde
>
> Currently HepPlanner#collectGarbage() will skip if there is no new transform
> since last GC. If HepPlanner is reused, it is common case that no transform
> is applied after last cheapest plan is built while before next round of
> optimize is kicked off.
> This may break HepPlanner because the garbage is probably not a graph after
> HepPlanner#buildFinalPlan .
> I'll try if I can create a reproduce case.
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