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https://issues.apache.org/jira/browse/CALCITE-4633?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17359550#comment-17359550
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Sean Broeder commented on CALCITE-4633:
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The case is similar to the example query where there is a union whose inputs
are joins. The tables have hundreds of columns, most of which are unused, so
trimming makes a a very big difference
> Enable RelFieldTrimmer to trim fields on a distinct UNION
> ---------------------------------------------------------
>
> Key: CALCITE-4633
> URL: https://issues.apache.org/jira/browse/CALCITE-4633
> Project: Calcite
> Issue Type: Improvement
> Components: core
> Affects Versions: 1.26.0
> Reporter: Sean Broeder
> Assignee: Sean Broeder
> Priority: Major
> Fix For: 1.28.0
>
>
> Should be able to push a project to trim fields on top of distinct union
> without changing results.
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