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Posted to jira@arrow.apache.org by "Dhruv Vats (Jira)" <ji...@apache.org> on 2022/02/18 17:35:00 UTC

[jira] [Commented] (ARROW-15152) Implement a `hash_list` aggregate function.

    [ https://issues.apache.org/jira/browse/ARROW-15152?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17494757#comment-17494757 ] 

Dhruv Vats commented on ARROW-15152:
------------------------------------

It isn't super obvious to me what is being asked. Could someone give an example of sorts? That'll be very helpful.

> Implement a `hash_list` aggregate function.
> -------------------------------------------
>
>                 Key: ARROW-15152
>                 URL: https://issues.apache.org/jira/browse/ARROW-15152
>             Project: Apache Arrow
>          Issue Type: New Feature
>          Components: C++, Python
>    Affects Versions: 6.0.1
>            Reporter: A. Coady
>            Assignee: Dhruv Vats
>            Priority: Major
>              Labels: good-second-issue, kernel
>
> For more advanced aggregations, it's helpful to be able to gather the grouped values into a list array. Pandas and Polars both have that feature. And `hash_distinct` already aggregates to lists, so all the building blocks are there.



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