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From "Hanifi Gunes (JIRA)" <j...@apache.org>
Subject [jira] [Created] (DRILL-1682) Do not use UnionExchange for read workloads
Date Tue, 11 Nov 2014 02:37:33 GMT
Hanifi Gunes created DRILL-1682:
-----------------------------------

             Summary: Do not use UnionExchange for read workloads
                 Key: DRILL-1682
                 URL: https://issues.apache.org/jira/browse/DRILL-1682
             Project: Apache Drill
          Issue Type: Bug
          Components: Query Planning & Optimization
            Reporter: Hanifi Gunes
            Assignee: Aman Sinha


Use of UnionExchange in read workloads provides minor gains considering the implementation,
maintenance overhead. Importantly it delays query termination as reported at DRILL-1681. Planner
ideally should avoid using it for read queries.



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