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  1. Apache Arrow
  2. ARROW-12123

[Rust][DataFusion] Use smallvec for indices for better join performance

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    Description

      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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              Dandandan Daniël Heres
              Dandandan Daniël Heres
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