slim bouguerra created HIVE-16816:
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Summary: 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
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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