Hanifi Gunes created DRILL-1682:
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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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