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https://issues.apache.org/jira/browse/ARROW-15584?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17563673#comment-17563673
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Jeroen van Straten commented on ARROW-15584:
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While this could be implemented before ARROW-16986, the way it would be
implemented depends heavily on whether that's been done yet, so doing this now
might duplicate some work. However, ARROW-16986 probably has lower priority.
> [C++] Add support for Substrait's RelCommon::Emit
> -------------------------------------------------
>
> Key: ARROW-15584
> URL: https://issues.apache.org/jira/browse/ARROW-15584
> Project: Apache Arrow
> Issue Type: Improvement
> Components: C++
> Reporter: Weston Pace
> Assignee: Vibhatha Lakmal Abeykoon
> Priority: Major
> Labels: substrait
>
> Any relation in Substrait is allowed to "emit" the output which means
> reordering the columns (and possibly dropping columns?).
> The C++ Substrait consumer currently does not handle this.
> This functionality could probably be handled by a project operation in the
> Arrow execution engine.
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