[jira] [Commented] (ARROW-15584) [C++] Add support for Substrait's RelCommon::Emit

["Jeroen van Straten (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/ARROW-15584?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17563673#comment-17563673 ] 

Jeroen van Straten commented on ARROW-15584:
--------------------------------------------

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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