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https://issues.apache.org/jira/browse/CALCITE-1714?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15934018#comment-15934018
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slim bouguerra commented on CALCITE-1714:
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https://github.com/apache/calcite/pull/409
> Do not push group by on druid metrics fields
> --------------------------------------------
>
> Key: CALCITE-1714
> URL: https://issues.apache.org/jira/browse/CALCITE-1714
> Project: Calcite
> Issue Type: Bug
> Components: druid
> Affects Versions: 1.12.0
> Reporter: slim bouguerra
> Assignee: Julian Hyde
>
> Druid does not support grouping by metrics, hence we can not push the group
> by to druid. Instead we should generate a select query.
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