neilconway commented on PR #20538:
URL: https://github.com/apache/datafusion/pull/20538#issuecomment-3956425171
Benchmarks:
```
┌────────────────────┬──────────────┬───────────┬─────────────┐
│ Benchmark │ std::HashSet │ hashbrown │ Improvement │
├────────────────────┼──────────────┼───────────┼─────────────┤
│ high_duplicate/10 │ 145.00 µs │ 68.94 µs │ -52.4% │
├────────────────────┼──────────────┼───────────┼─────────────┤
│ high_duplicate/50 │ 719.46 µs │ 350.68 µs │ -51.3% │
├────────────────────┼──────────────┼───────────┼─────────────┤
│ high_duplicate/100 │ 1.404 ms │ 674.83 µs │ -52.0% │
├────────────────────┼──────────────┼───────────┼─────────────┤
│ low_duplicate/10 │ 180.33 µs │ 107.87 µs │ -40.0% │
├────────────────────┼──────────────┼───────────┼─────────────┤
│ low_duplicate/50 │ 849.26 µs │ 530.89 µs │ -37.6% │
├────────────────────┼──────────────┼───────────┼─────────────┤
│ low_duplicate/100 │ 1.706 ms │ 987.72 µs │ -42.0% │
└────────────────────┴──────────────┴───────────┴─────────────┘
```
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