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https://issues.apache.org/jira/browse/HIVE-16816?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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slim bouguerra reassigned HIVE-16816:
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Assignee: slim bouguerra
> Chained Group by support for druid.
> -----------------------------------
>
> Key: HIVE-16816
> URL: https://issues.apache.org/jira/browse/HIVE-16816
> Project: Hive
> Issue Type: Sub-task
> Components: Druid integration
> Reporter: slim bouguerra
> Assignee: slim bouguerra
> Priority: Major
>
> This is more likely to be a calcite enhancement but am logging it here to
> track it any way.
> Currently queries like {code} select count (distinct dim) from table {code}
> is pushed partially to druid as group by dim followed by a count executed by
> hive QE. This can be enhanced by using the nested (eg chained execution)
> group by query such as the first (inner) GB query does group by key and the
> second (outer) does the count.
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