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https://issues.apache.org/jira/browse/ARROW-15152?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17494761#comment-17494761
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Dhruv Vats commented on ARROW-15152:
------------------------------------
Is it something like:
||Arg||Key||
|Yo|1|
|Hello|2|
|Howdy|2|
|Wassup|1|
|Yolo|3|
When {{hash_list}} is applied as aggregate to group by {{Key, }}the above{{
table}} becomes:
||hash_list(Arg)||Key||
|[Yo, Wassup]|1|
|[Hello, Howdy]|2|
|[Yolo]|3|
?
> 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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