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https://issues.apache.org/jira/browse/CALCITE-3111?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Julian Hyde resolved CALCITE-3111.
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    Fix Version/s: 1.21.0
       Resolution: Fixed

Fixed in 
[11116f6d|https://github.com/apache/calcite/commit/11116f6d03bca7cd97d151033c5d82f24394e229];
 thanks for the PR, [~Juhwan]!

> Add RelBuilder.correlate, and allow custom implementations of Correlate in 
> RelDecorrelator
> ------------------------------------------------------------------------------------------
>
>                 Key: CALCITE-3111
>                 URL: https://issues.apache.org/jira/browse/CALCITE-3111
>             Project: Calcite
>          Issue Type: Improvement
>          Components: core
>            Reporter: Juhwan Kim
>            Assignee: Juhwan Kim
>            Priority: Minor
>              Labels: pull-request-available
>             Fix For: 1.21.0
>
>          Time Spent: 4h 40m
>  Remaining Estimate: 0h
>
> Currently, RelDecorrelator code only works for LogicalCorrelate. 
> Decorrelating through Calcite would become much more flexible if it allows 
> using custom implementations of Correlate. This would require refactoring all 
> logical rels used in RelDecorrelator to the abstract ones(e.g 
> LogicalCorrelate -> Correlate).



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