neilconway commented on PR #21789:
URL: https://github.com/apache/datafusion/pull/21789#issuecomment-4315776923
Benchmarks:
```
lower_all_values_are_ascii: 1024 5.4µs
-> 5.3µs -1.9%
lower_all_values_are_ascii: 4096 21.4µs
-> 21.1µs -1.4%
lower_all_values_are_ascii: 8192 41.7µs
-> 41.3µs -1.0%
ascii_sv 4096 len10 nulls0 mixed=f 160.2µs
-> 151.4µs -5.5%
ascii_sv 4096 len10 nulls0 mixed=t 179.7µs
-> 181.1µs +0.8%
ascii_sv 4096 len10 nulls0.1 mixed=f 164.6µs
-> 141.7µs -13.9%
ascii_sv 4096 len10 nulls0.1 mixed=t 181.7µs
-> 172.8µs -4.9%
ascii_sv 4096 len64 nulls0 mixed=f 149.0µs
-> 154.1µs +3.4%
ascii_sv 4096 len64 nulls0 mixed=t 187.8µs
-> 194.8µs +3.7%
ascii_sv 4096 len64 nulls0.1 mixed=f 147.6µs
-> 145.4µs -1.5%
ascii_sv 4096 len64 nulls0.1 mixed=t 189.2µs
-> 178.2µs -5.8%
ascii_sv 4096 len128 nulls0 mixed=f 188.7µs
-> 191.2µs +1.3%
ascii_sv 4096 len128 nulls0 mixed=t 204.6µs
-> 202.6µs -1.0%
ascii_sv 4096 len128 nulls0.1 mixed=f 190.2µs
-> 172.8µs -9.1%
ascii_sv 4096 len128 nulls0.1 mixed=t 201.7µs
-> 195.0µs -3.3%
ascii_sv 8192 len10 nulls0 mixed=f 319.4µs
-> 303.8µs -4.9%
ascii_sv 8192 len10 nulls0 mixed=t 366.3µs
-> 363.6µs -0.7%
ascii_sv 8192 len10 nulls0.1 mixed=f 334.8µs
-> 284.6µs -15.0%
ascii_sv 8192 len10 nulls0.1 mixed=t 362.1µs
-> 339.0µs -6.4%
ascii_sv 8192 len64 nulls0 mixed=f 296.6µs
-> 309.1µs +4.2%
ascii_sv 8192 len64 nulls0 mixed=t 384.6µs
-> 384.0µs -0.2%
ascii_sv 8192 len64 nulls0.1 mixed=f 299.7µs
-> 290.6µs -3.0%
ascii_sv 8192 len64 nulls0.1 mixed=t 378.9µs
-> 355.4µs -6.2%
ascii_sv 8192 len128 nulls0 mixed=f 394.9µs
-> 415.3µs +5.2%
ascii_sv 8192 len128 nulls0 mixed=t 408.4µs
-> 407.4µs -0.2%
ascii_sv 8192 len128 nulls0.1 mixed=f 419.0µs
-> 350.9µs -16.3%
ascii_sv 8192 len128 nulls0.1 mixed=t 409.6µs
-> 388.3µs -5.2%
nonascii_sv 4096 len10 nulls0 mixed=f 372.8µs
-> 377.0µs +1.1%
nonascii_sv 4096 len10 nulls0 mixed=t 375.2µs
-> 372.6µs -0.7%
nonascii_sv 4096 len10 nulls0.1 mixed=f 345.5µs
-> 357.9µs +3.6%
nonascii_sv 4096 len10 nulls0.1 mixed=t 346.0µs
-> 340.7µs -1.5%
nonascii_sv 4096 len64 nulls0 mixed=f 358.9µs
-> 370.5µs +3.2%
nonascii_sv 4096 len64 nulls0 mixed=t 382.0µs
-> 386.4µs +1.2%
nonascii_sv 4096 len64 nulls0.1 mixed=f 353.7µs
-> 349.7µs -1.1%
nonascii_sv 4096 len64 nulls0.1 mixed=t 363.7µs
-> 340.3µs -6.4%
nonascii_sv 4096 len128 nulls0 mixed=f 371.6µs
-> 393.8µs +6.0%
nonascii_sv 4096 len128 nulls0 mixed=t 376.2µs
-> 387.4µs +3.0%
nonascii_sv 4096 len128 nulls0.1 mixed=f 349.6µs
-> 349.0µs -0.2%
nonascii_sv 4096 len128 nulls0.1 mixed=t 363.4µs
-> 341.1µs -6.1%
nonascii_sv 8192 len10 nulls0 mixed=f 738.5µs
-> 771.2µs +4.4%
nonascii_sv 8192 len10 nulls0 mixed=t 759.2µs
-> 760.1µs +0.1%
nonascii_sv 8192 len10 nulls0.1 mixed=f 705.8µs
-> 700.4µs -0.8%
nonascii_sv 8192 len10 nulls0.1 mixed=t 710.9µs
-> 695.0µs -2.2%
nonascii_sv 8192 len64 nulls0 mixed=f 781.1µs
-> 759.5µs -2.8%
nonascii_sv 8192 len64 nulls0 mixed=t 746.3µs
-> 791.6µs +6.1%
nonascii_sv 8192 len64 nulls0.1 mixed=f 726.4µs
-> 696.9µs -4.1%
nonascii_sv 8192 len64 nulls0.1 mixed=t 733.7µs
-> 690.0µs -6.0%
nonascii_sv 8192 len128 nulls0 mixed=f 746.5µs
-> 769.6µs +3.1%
nonascii_sv 8192 len128 nulls0 mixed=t 742.5µs
-> 764.1µs +2.9%
nonascii_sv 8192 len128 nulls0.1 mixed=f 745.2µs
-> 717.4µs -3.7%
nonascii_sv 8192 len128 nulls0.1 mixed=t 707.5µs
-> 699.9µs -1.1%
lower_the_first_value_is_nonascii: 1024 45.6µs
-> 42.6µs -6.6%
lower_the_first_value_is_nonascii: 4096 183.6µs
-> 172.7µs -5.9%
lower_the_first_value_is_nonascii: 8192 372.1µs
-> 356.5µs -4.2%
lower_the_middle_value_is_nonascii: 1024 45.8µs
-> 43.2µs -5.7%
lower_the_middle_value_is_nonascii: 4096 187.0µs
-> 175.7µs -6.0%
lower_the_middle_value_is_nonascii: 8192 373.2µs
-> 360.0µs -3.5%
```
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