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From "Aman Sinha (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (DRILL-1682) Avoid using UnionExchange for read workloads
Date Fri, 03 Jul 2015 06:46:04 GMT

     [ https://issues.apache.org/jira/browse/DRILL-1682?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Aman Sinha updated DRILL-1682:
------------------------------
    Fix Version/s:     (was: 1.2.0)
                   1.3.0

> Avoid using UnionExchange for read workloads
> --------------------------------------------
>
>                 Key: DRILL-1682
>                 URL: https://issues.apache.org/jira/browse/DRILL-1682
>             Project: Apache Drill
>          Issue Type: Improvement
>          Components: Query Planning & Optimization
>            Reporter: Hanifi Gunes
>            Assignee: Aman Sinha
>             Fix For: 1.3.0
>
>
> 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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