neilconway commented on PR #21814:
URL: https://github.com/apache/datafusion/pull/21814#issuecomment-4310378869
@comphead
```
Sliced ASCII
- parent=8192, slice=128, str_len=32: main 11.83 µs → branch 344 ns — ~34×
faster (−97.2%)
- parent=65536, slice=128, str_len=32: main 93 µs → branch 337 ns — ~275×
faster (−99.65%)
- parent=65536, slice=1024, str_len=32: main 94 µs → branch 1.66 µs — ~57×
faster (−98.3%)
Non-sliced ASCII (lower_all_values_are_ascii)
- size 1024: main 1.68 µs → branch 1.62 µs — −4.1%
- size 4096: main 6.27 µs → branch 6.27 µs — −2.0%
- size 8192: main 12.28 µs → branch 12.21 µs — −0.5%
Non-sliced non-ASCII, first row non-ASCII
(lower_the_first_value_is_nonascii)
- size 1024: main 20.89 µs → branch 19.79 µs — −5.3%
- size 4096: main 84.54 µs → branch 79.90 µs — −5.5%
- size 8192: main 156.10 µs → branch 160.77 µs — +2.5%
Non-sliced non-ASCII, middle row non-ASCII
(lower_the_middle_value_is_nonascii)
- size 1024: main 20.72 µs → branch 20.30 µs — +0.06% (noise)
- size 4096: main 84.68 µs → branch 85.42 µs — +1.3%
- size 8192: main 167.11 µs → branch 165.70 µs — +0.8% (noise)
```
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