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https://issues.apache.org/jira/browse/ARROW-9679?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andy Grove resolved ARROW-9679.
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Fix Version/s: 2.0.0
Resolution: Fixed
Issue resolved by pull request 7936
[https://github.com/apache/arrow/pull/7936]
> [Rust] [DataFusion] HashAggregate walks map many times building final batch
> ---------------------------------------------------------------------------
>
> Key: ARROW-9679
> URL: https://issues.apache.org/jira/browse/ARROW-9679
> Project: Apache Arrow
> Issue Type: Improvement
> Components: Rust, Rust - DataFusion
> Reporter: Andy Grove
> Assignee: Andy Grove
> Priority: Major
> Labels: pull-request-available
> Fix For: 2.0.0
>
> Time Spent: 2h
> Remaining Estimate: 0h
>
> The current HashAggregate implementation iterates over the final hash map
> once for each grouping expression and once for each aggregate expression.
> This is inefficient and possibly dangerous depending on the ordering
> gaurantees made by the hash map implementation.
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