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https://issues.apache.org/jira/browse/ARROW-15592?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17545303#comment-17545303
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Weston Pace commented on ARROW-15592:
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ARROW-15901 added some initial support here. There is still some work to be
done for nested fields.
> [C++] Add support for custom output field names in a substrait::PlanRel
> -----------------------------------------------------------------------
>
> Key: ARROW-15592
> URL: https://issues.apache.org/jira/browse/ARROW-15592
> Project: Apache Arrow
> Issue Type: Improvement
> Components: C++
> Reporter: Weston Pace
> Priority: Major
> Labels: substrait
>
> A Substrait plan consists of multiple relations. Some (only one?) of those
> relations can be "root" relations which means they name the output fields.
> We currently do not support this. It should be a straightforward projection
> to assign the field names.
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