Dandandan opened a new pull request #8800:
URL: https://github.com/apache/arrow/pull/8800
Speeds up sum kernel with nulls by simplifying mask calculation in inner
loop.
```
sum nulls 512 time: [227.43 ns 227.73 ns 228.09 ns]
change: [-53.623% -53.506% -53.391%] (p = 0.00 <
0.05)
Performance has improved.
Found 1 outliers among 100 measurements (1.00%)
1 (1.00%) high mild
```
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