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https://issues.apache.org/jira/browse/CALCITE-1873?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16075263#comment-16075263
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Gian Merlino commented on CALCITE-1873:
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More details & patch in the linked PR. For some reason, not clear to me at this
point, the error only happens if you are also ordering by an ordinal (like
"group by 1 order by 1").
> Validator errors when grouping by ordinals that refer to aliases
> ----------------------------------------------------------------
>
> Key: CALCITE-1873
> URL: https://issues.apache.org/jira/browse/CALCITE-1873
> Project: Calcite
> Issue Type: Bug
> Components: core
> Reporter: Gian Merlino
> Assignee: Julian Hyde
>
> Patch in https://github.com/apache/calcite/pull/490.
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