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https://issues.apache.org/jira/browse/ARROW-4748?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andy Grove resolved ARROW-4748.
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Fix Version/s: 1.0.0
Resolution: Fixed
Issue resolved by pull request 5636
[https://github.com/apache/arrow/pull/5636]
> [Rust] [DataFusion] GROUP BY performance could be optimized
> -----------------------------------------------------------
>
> Key: ARROW-4748
> URL: https://issues.apache.org/jira/browse/ARROW-4748
> Project: Apache Arrow
> Issue Type: Improvement
> Components: Rust, Rust - DataFusion
> Affects Versions: 0.12.0
> Reporter: Andy Grove
> Assignee: Andy Grove
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.0.0
>
> Time Spent: 0.5h
> Remaining Estimate: 0h
>
> The logic to build the group by keys is row-based, performing an array
> downcast on every single group by value. This could be done in a columnar way
> instead.
>
> I also wonder if it is possible to avoid converting the result map to an
> array of map entries.
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