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https://issues.apache.org/jira/browse/CALCITE-790?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Haisheng Yuan updated CALCITE-790:
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Attachment: image-2019-11-06-11-21-08-004.png
> Remove relational expressions that reference themselves
> -------------------------------------------------------
>
> Key: CALCITE-790
> URL: https://issues.apache.org/jira/browse/CALCITE-790
> Project: Calcite
> Issue Type: Bug
> Reporter: Julian Hyde
> Assignee: Julian Hyde
> Priority: Major
>
> Sometimes when two equivalence sets are merged (i.e. discovered to be
> equivalent) relational expressions in the sets end up referencing themselves.
> These are impossible to implement, cause a lot of useless rules to fire, and
> may cause stats calculations to go into a loop.
> We should look for cyclic expressions after merging sets and remove them.
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