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https://issues.apache.org/jira/browse/CALCITE-4432?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17251031#comment-17251031
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Ruben Q L commented on CALCITE-4432:
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[~Ziwei Liu], [~FatLittle] could you provide more info on this subject? Do you
manage to get a unit test that reproduces the problem? [~thomas.rebele] and I
are currently facing a very strange {{CyclicMetadataException}} issue and, from
what you described, it might be related to this bug.
> When the RelNode's input is the same subset as the node belonged to, not
> choose this node as best.
> --------------------------------------------------------------------------------------------------
>
> Key: CALCITE-4432
> URL: https://issues.apache.org/jira/browse/CALCITE-4432
> Project: Calcite
> Issue Type: Bug
> Components: core
> Reporter: Ziwei Liu
> Assignee: Ziwei Liu
> Priority: Major
>
> If a subset have a cyclic node, the node's input is this subset itself. If
> the besetÂ
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