psvri opened a new pull request, #5390:
URL: https://github.com/apache/arrow-rs/pull/5390
# Which issue does this PR close?
Closes #.
# Rationale for this change
While experimenting with improving like kernel, I found that we can check
for like pattern characters much more efficiently using memchr2.
# What changes are included in this PR?
Reworks like kernel logic. Perf numbers in my system is as below
```
regexp time: [14.796 ms 14.914 ms 15.039 ms]
change: [-3.3875% -2.2208% -1.0196%] (p = 0.00 <
0.05)
Performance has improved.
Found 18 outliers among 100 measurements (18.00%)
15 (15.00%) high mild
3 (3.00%) high severe
regexp scalar time: [9.8261 ms 9.9221 ms 10.018 ms]
change: [-1.6210% -0.3701% +0.8929%] (p = 0.57 >
0.05)
No change in performance detected.
```
# Are there any user-facing changes?
No
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