UBarney opened a new pull request, #14195:
URL: https://github.com/apache/datafusion/pull/14195
## Which issue does this PR close?
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Closes #12445.
## Rationale for this change
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Why are you proposing this change? If this is already explained clearly in
the issue then this section is not needed.
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See the issue.
## What changes are included in this PR?
+ If all characters in this string are within the ASCII range, reverse bytes
directly
+ Move `gen_string_array` in `benches/character_length.rs` to helper.rs
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sometimes worth providing a summary of the individual changes in this PR.
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## Are these changes tested?
Yes. Using existing unit test
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bench result
```
reverse_StringArray_ascii_str_len_8
time: [93.762 µs 94.463 µs 95.301 µs]
change: [-38.347% -37.726% -37.143%] (p = 0.00 <
0.05)
Performance has improved.
Found 9 outliers among 100 measurements (9.00%)
7 (7.00%) high mild
2 (2.00%) high severe
reverse_StringArray_utf8_density_0.8_str_len_8
time: [491.88 µs 496.57 µs 501.74 µs]
change: [-1.0373% +0.1648% +1.4032%] (p = 0.79 >
0.05)
No change in performance detected.
Found 6 outliers among 100 measurements (6.00%)
3 (3.00%) high mild
3 (3.00%) high severe
reverse_StringViewArray_ascii_str_len_8
time: [87.226 µs 87.666 µs 88.147 µs]
change: [-34.737% -34.039% -33.350%] (p = 0.00 <
0.05)
Performance has improved.
Found 4 outliers among 100 measurements (4.00%)
2 (2.00%) high mild
2 (2.00%) high severe
reverse_StringViewArray_utf8_density_0.8_str_len_8
time: [502.54 µs 505.02 µs 507.66 µs]
change: [-0.5734% +0.3619% +1.3269%] (p = 0.49 >
0.05)
No change in performance detected.
Found 7 outliers among 100 measurements (7.00%)
5 (5.00%) high mild
2 (2.00%) high severe
reverse_StringArray_ascii_str_len_32
time: [98.021 µs 98.794 µs 99.785 µs]
change: [-70.309% -70.056% -69.817%] (p = 0.00 <
0.05)
Performance has improved.
Found 8 outliers among 100 measurements (8.00%)
6 (6.00%) high mild
2 (2.00%) high severe
reverse_StringArray_utf8_density_0.8_str_len_32
time: [1.6026 ms 1.6100 ms 1.6181 ms]
change: [-0.0304% +1.0048% +2.0155%] (p = 0.07 >
0.05)
No change in performance detected.
Found 7 outliers among 100 measurements (7.00%)
5 (5.00%) high mild
2 (2.00%) high severe
reverse_StringViewArray_ascii_str_len_32
time: [102.37 µs 102.89 µs 103.44 µs]
change: [-68.935% -68.690% -68.454%] (p = 0.00 <
0.05)
Performance has improved.
Found 4 outliers among 100 measurements (4.00%)
2 (2.00%) high mild
2 (2.00%) high severe
reverse_StringViewArray_utf8_density_0.8_str_len_32
time: [1.6199 ms 1.6269 ms 1.6345 ms]
change: [+0.1269% +1.4123% +3.0235%] (p = 0.04 <
0.05)
Change within noise threshold.
Found 5 outliers among 100 measurements (5.00%)
2 (2.00%) high mild
3 (3.00%) high severe
reverse_StringArray_ascii_str_len_128
time: [166.01 µs 167.09 µs 168.33 µs]
change: [-84.421% -84.299% -84.176%] (p = 0.00 <
0.05)
Performance has improved.
Found 5 outliers among 100 measurements (5.00%)
5 (5.00%) high mild
reverse_StringArray_utf8_density_0.8_str_len_128
time: [6.1278 ms 6.1569 ms 6.1883 ms]
change: [-1.0026% -0.2737% +0.5242%] (p = 0.48 >
0.05)
No change in performance detected.
Found 6 outliers among 100 measurements (6.00%)
6 (6.00%) high mild
reverse_StringViewArray_ascii_str_len_128
time: [173.15 µs 174.16 µs 175.26 µs]
change: [-83.918% -83.731% -83.543%] (p = 0.00 <
0.05)
Performance has improved.
Found 9 outliers among 100 measurements (9.00%)
5 (5.00%) high mild
4 (4.00%) high severe
reverse_StringViewArray_utf8_density_0.8_str_len_128
time: [6.1279 ms 6.1637 ms 6.2028 ms]
change: [-1.3879% -0.5410% +0.3269%] (p = 0.22 >
0.05)
No change in performance detected.
Found 9 outliers among 100 measurements (9.00%)
7 (7.00%) high mild
2 (2.00%) high severe
reverse_StringArray_ascii_str_len_4096
time: [15.579 ms 15.687 ms 15.800 ms]
change: [-63.915% -63.620% -63.301%] (p = 0.00 <
0.05)
Performance has improved.
Found 2 outliers among 100 measurements (2.00%)
2 (2.00%) high mild
reverse_StringArray_utf8_density_0.8_str_len_4096
time: [215.98 ms 217.47 ms 219.18 ms]
change: [-0.0524% +0.8008% +1.6803%] (p = 0.07 >
0.05)
No change in performance detected.
Found 7 outliers among 100 measurements (7.00%)
4 (4.00%) high mild
3 (3.00%) high severe
reverse_StringViewArray_ascii_str_len_4096
time: [8.6421 ms 8.8760 ms 9.1174 ms]
change: [-75.462% -74.835% -74.087%] (p = 0.00 <
0.05)
Performance has improved.
Found 1 outliers among 100 measurements (1.00%)
1 (1.00%) high mild
reverse_StringViewArray_utf8_density_0.8_str_len_4096
time: [217.17 ms 218.29 ms 219.58 ms]
change: [+0.9451% +1.5937% +2.2792%] (p = 0.00 <
0.05)
Change within noise threshold.
Found 5 outliers among 100 measurements (5.00%)
3 (3.00%) high mild
2 (2.00%) high severe
```
## Are there any user-facing changes?
No
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