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Posted to dev@drill.apache.org by "Aman Sinha (JIRA)" <ji...@apache.org> on 2013/12/20 22:32:09 UTC

[jira] [Created] (DRILL-335) Implement hash aggregation operator for grouped aggregation

Aman Sinha created DRILL-335:
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             Summary: Implement hash aggregation operator for grouped aggregation
                 Key: DRILL-335
                 URL: https://issues.apache.org/jira/browse/DRILL-335
             Project: Apache Drill
          Issue Type: Bug
            Reporter: Aman Sinha


Placeholder for doing design and implementation of hash based aggregation in Drill.  Currently, it supports sort based aggregation.   Hash aggregation involves building a hash table on the grouping columns and maintaining workspace for each of the aggregate functions in the query.  This issue will focus on non-distinct aggregation for now (i.e aggregate function does not contain DISTINCT).  A separate issue will be created to track distinct aggregation. 



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