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Posted to jira@arrow.apache.org by "Joris Van den Bossche (Jira)" <ji...@apache.org> on 2021/02/24 13:10:00 UTC

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

    [ https://issues.apache.org/jira/browse/ARROW-11749?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17289909#comment-17289909 ] 

Joris Van den Bossche commented on ARROW-11749:
-----------------------------------------------

Somewhat related to ARROW-11001

> [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
>             Fix For: 4.0.0
>
>
> 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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