[jira] [Assigned] (ARROW-17245) [C++] Substrait aggregate rel has incorrect output order

["Apache Arrow JIRA Bot (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-17245?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Apache Arrow JIRA Bot reassigned ARROW-17245:
---------------------------------------------

    Assignee:     (was: Vibhatha Lakmal Abeykoon)

> [C++] Substrait aggregate rel has incorrect output order
> --------------------------------------------------------
>
>                 Key: ARROW-17245
>                 URL: https://issues.apache.org/jira/browse/ARROW-17245
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: C++
>            Reporter: Weston Pace
>            Priority: Major
>
> The output order for a Substrait aggregate is:
> {quote}
> The list of distinct columns from each grouping set (ordered by their first appearance) followed by the list of measures in declaration order
> {quote}
> However, the current aggregate node in Acero emits measures first and grouping set second.  This could be fixed with a supplementary project but it seems simpler to modify the aggregate node itself.  However, this would be a backwards incompatible change.



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