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https://issues.apache.org/jira/browse/ARROW-12044?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ben Kietzman updated ARROW-12044:
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Labels: query-engine (was: )
> [C++][Compute] Add support for imperfect grouping for use in radix
> partitioning
> -------------------------------------------------------------------------------
>
> Key: ARROW-12044
> URL: https://issues.apache.org/jira/browse/ARROW-12044
> Project: Apache Arrow
> Issue Type: Improvement
> Components: C++
> Reporter: Ben Kietzman
> Priority: Major
> Labels: query-engine
>
> ARROW-11591 adds Grouper for identifying groups based on multiple key columns.
> For a large number of groups, it is beneficial to do a first pass
> partitioning on the key columns so that each worker thread only handles a
> subset of the query's groups. This is usually accomplished by computing only
> the hashes of the keys (not full group identity) and pushing slices of the
> input batches to workers based on those.
> This would probably make sense as a member function of Grouper, maybe
> Grouper::ConsumeImperfect
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