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https://issues.apache.org/jira/browse/CALCITE-2730?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16715176#comment-16715176
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Zoltan Haindrich commented on CALCITE-2730:
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without equals being fully operable: equals() acted as a == ...I think
replaceAll was just an easy way to write the replacement instruction
> RelBuilder simplifies a filter with duplicate conjunction to empty
> ------------------------------------------------------------------
>
> Key: CALCITE-2730
> URL: https://issues.apache.org/jira/browse/CALCITE-2730
> Project: Calcite
> Issue Type: Bug
> Components: core
> Affects Versions: next
> Reporter: Stamatis Zampetakis
> Assignee: Julian Hyde
> Priority: Major
> Fix For: 1.18.0
>
>
> Regression from 1.17.
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