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https://issues.apache.org/jira/browse/IMPALA-4961?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tim Armstrong resolved IMPALA-4961.
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Resolution: Later
Unclear that many workloads would benefit from it.
> Allow Union node passthrough in more advanced cases
> ---------------------------------------------------
>
> Key: IMPALA-4961
> URL: https://issues.apache.org/jira/browse/IMPALA-4961
> Project: IMPALA
> Issue Type: New Feature
> Components: Backend, Frontend
> Affects Versions: Impala 2.9.0
> Reporter: Taras Bobrovytsky
> Priority: Major
> Labels: ramp-up
>
> It should be possible to pass through rows without materialization in the
> following cases:
> # If both union branches have joins, but the resulting tuple layout is
> identical.
> # If the same column is referenced in the select list multiple times, for
> example:
> {code}
> select id, id from alltypes union select id, id from alltypestiny
> {code}
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