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https://issues.apache.org/jira/browse/ARROW-17328?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17576024#comment-17576024
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David Li commented on ARROW-17328:
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FWIW, I punted on this one last year since it might require unbounded state
(but I suppose it's basically the same as say {{hash_list}} which we do have)
> [C++] Add hash_mode function
> ----------------------------
>
> Key: ARROW-17328
> URL: https://issues.apache.org/jira/browse/ARROW-17328
> Project: Apache Arrow
> Issue Type: New Feature
> Components: C++
> Reporter: Ian Cook
> Priority: Major
> Labels: kernel
>
> Arrow currently has a {{mode}} kernel but no {{hash_mode}} kernel.
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