slim bouguerra reassigned HIVE-16816:

    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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