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Posted to jira@arrow.apache.org by "Antoine Pitrou (Jira)" <ji...@apache.org> on 2021/09/22 16:02:00 UTC

[jira] [Comment Edited] (ARROW-14073) [C++] Forbid mentioning the same column twice in sort keys

    [ https://issues.apache.org/jira/browse/ARROW-14073?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17418681#comment-17418681 ] 

Antoine Pitrou edited comment on ARROW-14073 at 9/22/21, 4:01 PM:
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Yes, we can also dedupe and only keep the first. Note of course that a different order may have been specified (but "ORDER BY a ASC, a DESC" is probably logically equivalent to "ORDER BY a ASC").


was (Author: pitrou):
Yes, we can also dedupe and only keep the first.

> [C++] Forbid mentioning the same column twice in sort keys
> ----------------------------------------------------------
>
>                 Key: ARROW-14073
>                 URL: https://issues.apache.org/jira/browse/ARROW-14073
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: C++
>            Reporter: Antoine Pitrou
>            Priority: Minor
>
> It's currently possible to mention the same column several times in a sort's keys, which is not really useful.



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