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https://issues.apache.org/jira/browse/IMPALA-13659?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Work on IMPALA-13659 started by Joe McDonnell.
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> Allow union in cached subtree
> -----------------------------
>
> Key: IMPALA-13659
> URL: https://issues.apache.org/jira/browse/IMPALA-13659
> Project: IMPALA
> Issue Type: Improvement
> Reporter: Michael Smith
> Assignee: Joe McDonnell
> Priority: Major
>
> Allow UNION nodes in a cached subtree. Skip placing a tuple cache node above
> unions however, as this will always result in a larger cache entry than the
> components of the union. This is primarily useful for aggregation of union
> results.
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