Dandandan opened a new pull request #8723:
URL: https://github.com/apache/arrow/pull/8723
Commonly used patterns '%xxx' 'xxx%' and '%xxx' can use faster methods from
Rust standard lib instead.
```
like_utf8 scalar equals time: [828.13 us 830.08 us 832.39 us]
change: [-43.306% -42.962% -42.610%] (p = 0.00 <
0.05)
Performance has improved.
Found 12 outliers among 100 measurements (12.00%)
like_utf8 scalar ends with
time: [927.93 us 929.31 us 930.88 us]
change: [-59.220% -59.149% -59.082%] (p = 0.00 <
0.05)
Performance has improved.
Found 1 outliers among 100 measurements (1.00%)
1 (1.00%) high mild
like_utf8 scalar starts with
time: [930.96 us 931.70 us 932.63 us]
change: [-43.537% -43.432% -43.325%] (p = 0.00 <
0.05)
Performance has improved.
```
Also tried fast path for contains (`%xxx%`), but that was slower than using
the regex.
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