drill-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Aman Sinha (JIRA)" <j...@apache.org>
Subject [jira] [Created] (DRILL-335) Implement hash aggregation operator for grouped aggregation
Date Fri, 20 Dec 2013 21:32:09 GMT
Aman Sinha created DRILL-335:
--------------------------------

             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. 



--
This message was sent by Atlassian JIRA
(v6.1.4#6159)

Mime
View raw message