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https://issues.apache.org/jira/browse/CALCITE-7915?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ASF GitHub Bot updated CALCITE-7915:
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Labels: pull-request-available (was: )
> RelDecorrelator does not recognize IS NOT DISTINCT FROM as correlation
> equivalent
> ---------------------------------------------------------------------------------
>
> Key: CALCITE-7915
> URL: https://issues.apache.org/jira/browse/CALCITE-7915
> Project: Calcite
> Issue Type: Improvement
> Components: core
> Affects Versions: 1.42.0
> Reporter: Yu Xu
> Assignee: Yu Xu
> Priority: Minor
> Labels: pull-request-available
>
> RelDecorrelator#findCorrelationEquivalent only recognizes EQUALS (=) when
> establishing correlation variable equivalences. This means conditions using
> IS NOT DISTINCT FROM are ignored, potentially causing decorrelation to fail
> or fall back to value generators unnecessarily.
>
> eg:
> {code:java}
> SELECT * FROM emp e WHERE EXISTS ( SELECT * FROM dept d WHERE
> d.deptno IS NOT DISTINCT FROM e.deptno )
> {code}
> Current behavior: The IS_NOT_DISTINCT_FROM condition is not recognized as
> establishing an equivalence between $cor.deptno and d.deptno, so a value
> generator may be created even when not strictly necessary.
>
>
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