alamb commented on PR #6402:
URL: https://github.com/apache/arrow-rs/pull/6402#issuecomment-2353455162
I ran with this branch and saw no performance difference (as expected)
```
++ critcmp master master
group master
----- ------
cast binary view to string 1.00 110.1±0.43µs
? ?/sec
cast binary view to string view 1.00 112.7±0.20µs
? ?/sec
cast binary view to wide string 1.00 114.9±0.33µs
? ?/sec
cast date32 to date64 512 1.00 401.5±0.98ns
? ?/sec
cast date64 to date32 512 1.00 609.6±1.19ns
? ?/sec
cast decimal128 to decimal128 512 1.00 2.9±0.01µs
? ?/sec
cast decimal128 to decimal128 512 with same scale 1.00 74.9±0.18ns
? ?/sec
cast decimal128 to decimal256 512 1.00 9.8±0.39µs
? ?/sec
cast decimal256 to decimal128 512 1.00 46.4±0.13µs
? ?/sec
cast decimal256 to decimal256 512 1.00 9.8±0.02µs
? ?/sec
cast decimal256 to decimal256 512 with same scale 1.00 75.1±0.15ns
? ?/sec
cast dict to string view 1.00 51.3±0.17µs
? ?/sec
cast f32 to string 512 1.00 22.4±0.11µs
? ?/sec
cast f64 to string 512 1.00 25.3±0.04µs
? ?/sec
cast float32 to int32 512 1.00 1565.7±2.27ns
? ?/sec
cast float64 to float32 512 1.00 1563.9±1.74ns
? ?/sec
cast float64 to uint64 512 1.00 2.1±0.27µs
? ?/sec
cast i64 to string 512 1.00 18.2±0.06µs
? ?/sec
cast int32 to float32 512 1.00 1453.1±1.31ns
? ?/sec
cast int32 to float64 512 1.00 1597.6±2.62ns
? ?/sec
cast int32 to int32 512 1.00 226.3±0.38ns
? ?/sec
cast int32 to int64 512 1.00 1651.7±1.74ns
? ?/sec
cast int32 to uint32 512 1.00 1652.3±9.38ns
? ?/sec
cast int64 to int32 512 1.00 1699.4±2.37ns
? ?/sec
cast string to binary view 512 1.00 3.6±0.01µs
? ?/sec
cast string view to binary view 1.00 95.9±0.24ns
? ?/sec
cast string view to dict 1.00 217.9±0.67µs
? ?/sec
cast string view to string 1.00 194.5±0.47µs
? ?/sec
cast string view to wide string 1.00 199.9±0.42µs
? ?/sec
cast time32s to time32ms 512 1.00 327.9±1.28ns
? ?/sec
cast time32s to time64us 512 1.00 410.9±51.93ns
? ?/sec
cast time64ns to time32s 512 1.00 612.8±1.39ns
? ?/sec
cast timestamp_ms to i64 512 1.00 514.7±2.73ns
? ?/sec
cast timestamp_ms to timestamp_ns 512 1.00 2.6±0.01µs
? ?/sec
cast timestamp_ns to timestamp_s 512 1.00 223.4±0.45ns
? ?/sec
cast utf8 to date32 512 1.00 11.4±0.04µs
? ?/sec
cast utf8 to date64 512 1.00 40.2±0.13µs
? ?/sec
cast utf8 to f32 1.00 15.4±0.02µs
? ?/sec
cast wide string to binary view 512 1.00 5.9±0.01µs
? ?/sec
```
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