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https://issues.apache.org/jira/browse/ARROW-4748?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17661770#comment-17661770
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Rok Mihevc commented on ARROW-4748:
-----------------------------------
This issue has been migrated to [issue
#21267|https://github.com/apache/arrow/issues/21267] on GitHub. Please see the
[migration documentation|https://github.com/apache/arrow/issues/14542] for
further details.
> [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: 0.16.0
>
> 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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