neilconway commented on PR #20352:
URL: https://github.com/apache/datafusion/pull/20352#issuecomment-3899864982
Benchmarks:
```
$ critcmp initcap-v2-vanilla initcap-v2-opt
group initcap-v2-opt
initcap-v2-vanilla
----- --------------
------------------
initcap scalar/scalar_utf8 1.00 99.3±0.82ns
? ?/sec 1.53 151.7±0.87ns ? ?/sec
initcap scalar/scalar_utf8view 1.00 93.2±2.04ns
? ?/sec 1.74 162.3±2.52ns ? ?/sec
initcap size=1024 str_len=128/array_utf8 1.00 96.6±0.16µs
? ?/sec 1.42 137.3±0.69µs ? ?/sec
initcap size=1024 str_len=128/array_utf8view 1.00 73.2±0.05µs
? ?/sec 1.81 132.3±0.24µs ? ?/sec
initcap size=1024 str_len=16/array_utf8 1.00 13.6±0.02µs
? ?/sec 1.55 21.0±0.06µs ? ?/sec
initcap size=1024 str_len=16/array_utf8view 1.00 16.9±0.05µs
? ?/sec 1.32 22.3±0.05µs ? ?/sec
initcap size=4096 str_len=128/array_utf8 1.00 384.7±0.50µs
? ?/sec 1.42 547.1±3.02µs ? ?/sec
initcap size=4096 str_len=128/array_utf8view 1.00 291.6±0.28µs
? ?/sec 1.82 529.4±3.35µs ? ?/sec
initcap size=4096 str_len=16/array_utf8 1.00 52.9±0.07µs
? ?/sec 1.56 82.5±0.14µs ? ?/sec
initcap size=4096 str_len=16/array_utf8view 1.00 65.7±0.12µs
? ?/sec 1.36 89.4±0.48µs ? ?/sec
initcap size=8192 str_len=128/array_utf8 1.00 770.2±1.22µs
? ?/sec 1.42 1096.4±2.68µs ? ?/sec
initcap size=8192 str_len=128/array_utf8view 1.00 580.4±0.60µs
? ?/sec 1.82 1059.1±5.74µs ? ?/sec
initcap size=8192 str_len=16/array_utf8 1.00 105.4±0.38µs
? ?/sec 1.58 166.3±0.41µs ? ?/sec
initcap size=8192 str_len=16/array_utf8view 1.00 130.2±0.54µs
? ?/sec 1.38 179.5±1.16µs ? ?/sec
```
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