[jira] [Commented] (ARROW-11749) [C++][Dataset] Support projections between children of UnionDatasets

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

    [ https://issues.apache.org/jira/browse/ARROW-11749?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17616619#comment-17616619 ] 

Apache Arrow JIRA Bot commented on ARROW-11749:
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This issue was last updated over 90 days ago, which may be an indication it is no longer being actively worked. To better reflect the current state, the issue is being unassigned per [project policy|https://arrow.apache.org/docs/dev/developers/bug_reports.html#issue-assignment]. Please feel free to re-take assignment of the issue if it is being actively worked, or if you plan to start that work soon.

> [C++][Dataset] Support projections between children of UnionDatasets
> --------------------------------------------------------------------
>
>                 Key: ARROW-11749
>                 URL: https://issues.apache.org/jira/browse/ARROW-11749
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: C++
>    Affects Versions: 3.0.0
>            Reporter: Ben Kietzman
>            Assignee: Ben Kietzman
>            Priority: Major
>              Labels: dataset
>
> ARROW-11174 adds support for arbitrary expressions in projection. It'd be useful to have that power when unifying disparate child datasets. For example, even the simple case where a column is renamed in a newer data file currently cannot be accommodated.



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