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https://issues.apache.org/jira/browse/ARROW-14073?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17418685#comment-17418685
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Antoine Pitrou commented on ARROW-14073:
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Keep last would be inconsistent, wouldn't it?
> [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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