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https://issues.apache.org/jira/browse/IMPALA-8999?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tim Armstrong resolved IMPALA-8999.
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Fix Version/s: Impala 3.4.0
Resolution: Fixed
> Parallelise all plans, including UNION, when mt_dop > 1
> -------------------------------------------------------
>
> Key: IMPALA-8999
> URL: https://issues.apache.org/jira/browse/IMPALA-8999
> Project: IMPALA
> Issue Type: Sub-task
> Components: Distributed Exec
> Reporter: Tim Armstrong
> Assignee: Tim Armstrong
> Priority: Major
> Fix For: Impala 3.4.0
>
>
> We should do another pass over the scheduler to make sure that the logic
> makes sense for mt_dop.
> There are some comments in scheduler.cc, e.g. talking about optimisations for
> UNION.
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