etseidl commented on issue #6219:
URL: https://github.com/apache/arrow-rs/issues/6219#issuecomment-2283077379
I did a quick test of FIXED_LEN_BYTE_ARRAY(16)/Decima128 vs unannotated
FIXED_LEN_BYTE_ARRAY(16), and the latter was much faster.
```
arrow_array_reader/FIXED_LENGTH_BYTE_ARRAY/Decimal128Array/plain encoded,
mandatory, no NULLs
time: [1.0326 ms 1.0456 ms 1.0595 ms]
arrow_array_reader/FIXED_LENGTH_BYTE_ARRAY/FixedLen(16)Array/plain encoded,
mandatory, no NULLs
time: [110.30 µs 110.48 µs 110.67 µs]
```
I don't think FLBA decoding in the arrow reader is the culprit.
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