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https://issues.apache.org/jira/browse/CALCITE-3819?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ASF GitHub Bot updated CALCITE-3819:
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Labels: pull-request-available (was: )
> Prune parent RelNode when merging child RelSet with parent RelSet
> -----------------------------------------------------------------
>
> Key: CALCITE-3819
> URL: https://issues.apache.org/jira/browse/CALCITE-3819
> Project: Calcite
> Issue Type: Improvement
> Components: core
> Reporter: Haisheng Yuan
> Assignee: Haisheng Yuan
> Priority: Major
> Labels: pull-request-available
>
> Suppose we have 2 RelSets:
> RelSet A: rel1
> RelSet B: rel2
> rel1 is the parent of rel2.
> If there is a transformation rule that transform rel1 to rel2, we will merge
> RelSet A and B. During merge process, we can safely prune rel1 to avoid
> further rule apply on rel1 and reduce search space, more importantly, avoid
> cyclic reference.
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