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Posted to dev@hive.apache.org by "Nishant Bangarwa (JIRA)" <ji...@apache.org> on 2018/08/02 13:26:00 UTC

[jira] [Created] (HIVE-20297) Column Level Stats for Druid Tables

Nishant Bangarwa created HIVE-20297:
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             Summary: Column Level Stats for Druid Tables
                 Key: HIVE-20297
                 URL: https://issues.apache.org/jira/browse/HIVE-20297
             Project: Hive
          Issue Type: Improvement
            Reporter: Nishant Bangarwa
            Assignee: Nishant Bangarwa


This task is to have correct column level stats for druid in hive metastore. 
- Stats like min/max/cardinality can be gathered using a Druid Segment Metadata Query. 
- Druid Query planning we need to ensure that the filters/Aggregations pushed inside DruidQuery are accounted for.

Having correct stats would also help optimizer ensure proper join orderings when doing federated complex joins between hive/druid. 




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