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https://issues.apache.org/jira/browse/CALCITE-4633?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17359688#comment-17359688
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Julian Hyde commented on CALCITE-4633:
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[~sbroeder], You have not yet given a rule when it is OK to trim fields.
"hundreds of columns, most of which are unused," is not a rule.
> 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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