Philipp Moritz created ARROW-5002:
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Summary: [C++] Implement GroupBy
Key: ARROW-5002
URL: https://issues.apache.org/jira/browse/ARROW-5002
Project: Apache Arrow
Issue Type: Improvement
Reporter: Philipp Moritz
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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