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https://issues.apache.org/jira/browse/CALCITE-1943?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16141088#comment-16141088
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Dian Fu commented on CALCITE-1943:
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[~julianhyde], I have updated the PR, documented the rationale at the header of
class {{NavigationReplacer}} and also updated the commit message.
> Add back NavigationExpander and NavigationReplacer in SqlValidatorImpl
> ----------------------------------------------------------------------
>
> Key: CALCITE-1943
> URL: https://issues.apache.org/jira/browse/CALCITE-1943
> Project: Calcite
> Issue Type: Bug
> Reporter: Dian Fu
> Assignee: Julian Hyde
>
> {{NavigationExpander}} and {{NavigationReplacer}} was deleted as a fix of
> issue CALCITE-1871. Just create this ticket to track whether we should add
> them back.
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