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https://issues.apache.org/jira/browse/ARROW-5002?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17662024#comment-17662024
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Rok Mihevc commented on ARROW-5002:
-----------------------------------
This issue has been migrated to [issue
#21501|https://github.com/apache/arrow/issues/21501] on GitHub. Please see the
[migration documentation|https://github.com/apache/arrow/issues/14542] for
further details.
> [C++] Implement Hash Aggregation query execution node
> -----------------------------------------------------
>
> Key: ARROW-5002
> URL: https://issues.apache.org/jira/browse/ARROW-5002
> Project: Apache Arrow
> Issue Type: Improvement
> Components: C++
> Reporter: Philipp Moritz
> Priority: Major
> Labels: query-engine
> Fix For: 6.0.0
>
>
> Dear all,
> I wonder what the best way forward is for implementing GroupBy kernels.
> Initially this was part of
> https://issues.apache.org/jira/browse/ARROW-4124
> but is not contained in the current implementation as far as I can tell.
> It seems that the part of group by that just returns indices could be
> conveniently implemented with the HashKernel. That seems useful in any case.
> Is that indeed the best way forward/should this be done?
> GroupBy + Aggregate could then either be implemented with that + the Take
> kernel + aggregation involving more memory copies than necessary though or as
> part of the aggregate kernel. Probably the latter is preferred, any thoughts
> on that?
> Am I missing any other JIRAs related to this?
> Best, Philipp.
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