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https://issues.apache.org/jira/browse/CALCITE-1943?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16126885#comment-16126885
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Dian Fu commented on CALCITE-1943:
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For {{NavigationExpander}}, currently I have not got a quite convincing
explanation we should add it back. While for {{NavigationReplacer}}, I think it
has its values. {{NavigationReplacer}} can convert expressions like {{A.price >
PREV(B.price)}} to {{PREV(A.price, 0) > PREV(B.price, 1)}}. This will make the
implementation unified:
1) step 1: RexPatternFieldRef A.price or B.price
2) step 2: RexCall (PREV)
> 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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