Daniël Heres created ARROW-12123:
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Summary: [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
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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