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https://issues.apache.org/jira/browse/DRILL-1682?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14205916#comment-14205916
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Jacques Nadeau commented on DRILL-1682:
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To expound on this, I think this is primarily important when we're doing
smallish read queries that are being returned to screen.
> Avoid using 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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