etseidl commented on PR #6297:
URL: https://github.com/apache/arrow-rs/pull/6297#issuecomment-2307853546
Benchmark results for these changes (pad loop is as in master branch):
```
group
pad_loop
pad_nulls_vec2
-----
--------
--------------
arrow_array_reader/FIXED_LEN_BYTE_ARRAY/Decimal128Array/byte_stream_split
encoded, optional, half NULLs 1.45 558.3±4.21µs ? ?/sec 1.00
385.9±3.98µs ? ?/sec
arrow_array_reader/FIXED_LEN_BYTE_ARRAY/Decimal128Array/plain encoded,
optional, half NULLs 1.67 422.5±4.04µs ? ?/sec 1.00
253.3±4.98µs ? ?/sec
arrow_array_reader/FIXED_LEN_BYTE_ARRAY/Float16Array/byte_stream_split
encoded, optional, half NULLs 1.03 119.9±0.74µs ? ?/sec 1.00
116.5±1.73µs ? ?/sec
arrow_array_reader/FIXED_LEN_BYTE_ARRAY/Float16Array/plain encoded,
optional, half NULLs 1.04 105.7±1.24µs ? ?/sec
1.00 101.2±1.09µs ? ?/sec
arrow_array_reader/FixedLenByteArray(16)/byte_stream_split encoded,
optional, half NULLs 1.63 440.0±1.65µs ? ?/sec
1.00 269.5±1.76µs ? ?/sec
arrow_array_reader/FixedLenByteArray(16)/plain encoded, optional, half NULLs
2.17 297.8±3.19µs ? ?/sec 1.00
137.1±3.25µs ? ?/sec
arrow_array_reader/FixedLenByteArray(2)/byte_stream_split encoded, optional,
half NULLs 1.07 108.4±4.14µs ? ?/sec 1.00
101.2±1.03µs ? ?/sec
arrow_array_reader/FixedLenByteArray(2)/plain encoded, optional, half NULLs
1.00 86.8±1.53µs ? ?/sec 1.00
86.8±1.62µs ? ?/sec
arrow_array_reader/FixedLenByteArray(4)/byte_stream_split encoded, optional,
half NULLs 1.01 148.4±1.92µs ? ?/sec 1.00
146.9±1.62µs ? ?/sec
arrow_array_reader/FixedLenByteArray(4)/plain encoded, optional, half NULLs
1.02 117.0±0.40µs ? ?/sec 1.00
115.2±1.27µs ? ?/sec
arrow_array_reader/FixedLenByteArray(8)/byte_stream_split encoded, optional,
half NULLs 1.33 241.4±2.93µs ? ?/sec 1.00
181.5±2.62µs ? ?/sec
arrow_array_reader/FixedLenByteArray(8)/plain encoded, optional, half NULLs
1.49 174.5±3.44µs ? ?/sec 1.00
116.9±1.26µs ? ?/sec
```
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