alamb commented on PR #9120:
URL: https://github.com/apache/arrow-rs/pull/9120#issuecomment-3738313279
Here are my measurements on my machine
```shell
cargo bench --features="arrow async" --bench arrow_reader_clickbench -- Q21
```
Merge base
```
arrow_reader_clickbench/sync/Q21
time: [119.27 ms 119.51 ms 119.77 ms]
Found 6 outliers among 100 measurements (6.00%)
5 (5.00%) high mild
1 (1.00%) high severe
Benchmarking arrow_reader_clickbench/async/Q21: Warming up for 3.0000 s
Warning: Unable to complete 100 samples in 5.0s. You may wish to increase
target time to 6.9s, or reduce sample count to 70.
arrow_reader_clickbench/async/Q21
time: [69.156 ms 69.354 ms 69.559 ms]
Found 2 outliers among 100 measurements (2.00%)
2 (2.00%) high mild
```
This branch
```
arrow_reader_clickbench/sync/Q21
time: [118.80 ms 119.31 ms 119.89 ms]
change: [−0.6606% −0.1639% +0.3667%] (p = 0.53 >
0.05)
No change in performance detected.
Found 21 outliers among 100 measurements (21.00%)
6 (6.00%) high mild
15 (15.00%) high severe
Benchmarking arrow_reader_clickbench/async/Q21: Warming up for 3.0000 s
Warning: Unable to complete 100 samples in 5.0s. You may wish to increase
target time to 6.8s, or reduce sample count to 70.
arrow_reader_clickbench/async/Q21
time: [68.356 ms 68.459 ms 68.577 ms]
change: [−1.6200% −1.2901% −0.9603%] (p = 0.00 <
0.05)
Change within noise threshold.
Found 11 outliers among 100 measurements (11.00%)
7 (7.00%) high mild
4 (4.00%) high severe
```
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