neilconway commented on PR #10974:
URL: https://github.com/apache/arrow-rs/pull/10974#issuecomment-5526969677
CSV reader benchmark:
```
4096 decimal32(9, 2) 9 digits(0) 92.652
µs -13.4%
4096 decimal64(18, 2) 18 digits(0) 126.83
µs -3.7%
4096 decimal128(10, 2) 5 digits(0) 71.066
µs -4.8%
4096 decimal128(10, 2) 10 digits(0) 84.078
µs -10.5%
4096 decimal128(18, 6) 18 digits(0) 114.63
µs -13.2%
4096 decimal128(38, 10) 38 digits(0) 194.74
µs -18.4%
4096 decimal256(76, 10) 76 digits(0) 380.25
µs -14.1%
4096 decimal128(10, 2), decimal128(18, 6), decimal128(10, 1)(0) 246.16
µs -12.7%
```
parse_decimal microbenchmark:
```
123.123 9.48 7.90 -16.7%
123.1234 12.95 11.35 -12.3%
123.1 12.08 11.22 -7.1%
123 10.95 10.49 -4.2%
-123.123 9.60 8.17 -15.0%
-123.1234 12.97 11.54 -11.0%
-123.1 12.02 11.47 -4.6%
-123 11.10 10.70 -3.6%
0.0000123 11.40 8.24 -27.7%
12. 10.61 10.27 -3.2%
-12. 10.62 10.52 -0.9%
00.1 11.46 10.78 -5.9%
-00.1 11.54 11.04 -4.3%
12345678912345678.1234 28.09 24.53 -12.7%
-12345678912345678.1234 27.90 24.70 -11.5%
99999999999999999.999 24.28 19.93 -17.9%
-99999999999999999.999 24.02 20.28 -15.6%
.123 7.73 6.35 -17.8%
-.123 7.99 6.61 -17.4%
123. 11.33 10.70 -5.5%
-123. 11.38 10.95 -3.8%
string decimal128 short 10.34 8.40 -18.7%
string decimal128 integer 15.82 11.46 -27.6%
string decimal128 exact scale 15.86 11.64 -26.6%
string decimal128 padded scale 15.11 10.84 -28.2%
string decimal128 rounded scale 19.46 15.42 -20.7%
string decimal128 signed 19.45 15.40 -20.9%
string decimal128 38 digits 32.98 24.31 -26.3%
string decimal128 exponent 24.91 20.50 -17.7%
string decimal128 negative exponent 28.35 18.96 -33.1%
string decimal128 negative scale 22.22 18.47 -16.9%
string decimal128 long fraction 29.11 22.56 -22.5%
string decimal256 76 digits 71.40 59.15 -17.2%
string decimal256 rounded scale 67.08 55.99 -16.5%
string decimal32 short 11.56 8.51 -26.4%
string decimal32 9 digits 14.32 10.56 -26.3%
string decimal64 short 8.19 7.49 -8.5%
string decimal64 18 digits 17.14 12.32 -28.1%
```
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