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https://issues.apache.org/jira/browse/ARROW-12123?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andrew Lamb resolved ARROW-12123.
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Fix Version/s: 4.0.0
Resolution: Fixed
Issue resolved by pull request 9826
[https://github.com/apache/arrow/pull/9826]
> [Rust][DataFusion] Use smallvec for indices for better join performance
> -----------------------------------------------------------------------
>
> Key: ARROW-12123
> URL: https://issues.apache.org/jira/browse/ARROW-12123
> Project: Apache Arrow
> Issue Type: Improvement
> Components: Rust - DataFusion
> Reporter: Daniël Heres
> Assignee: Daniël Heres
> Priority: Major
> Labels: pull-request-available
> Fix For: 4.0.0
>
> Time Spent: 50m
> Remaining Estimate: 0h
>
> Change type from
> HashMap<u64, Vec<[u64; 1]>
> to
> HashMap<u64, SmallVec<[u64; 1]>
> for better performance whenever each value is represented (mostly) once
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