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https://issues.apache.org/jira/browse/CALCITE-2437?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Vladimir Sitnikov resolved CALCITE-2437.
----------------------------------------
       Resolution: Fixed
    Fix Version/s: 1.19.0

Fixed inĀ 
https://gitbox.apache.org/repos/asf?p=calcite.git;a=commit;h=71d30c6cbed3dce5ce1d1927212677c65840e003

> FilterMultiJoinMergeRule doesn't combine postFilterCondition
> ------------------------------------------------------------
>
>                 Key: CALCITE-2437
>                 URL: https://issues.apache.org/jira/browse/CALCITE-2437
>             Project: Calcite
>          Issue Type: Bug
>          Components: core
>            Reporter: Laurent Goujon
>            Assignee: Julian Hyde
>            Priority: Major
>             Fix For: 1.19.0
>
>
> {{FilterMultiJoinMergeRule}} merges a {{Filter}} on top of a {{MultiJoin}} 
> into the multi join itself as part of its post-join filter condition. But the 
> rule doesn't seem to combine the top filter with the existing condition.
> I actually believe it's a bug in the code, although I never triggered it 
> myself.



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