jorgecarleitao opened a new pull request #9032:
URL: https://github.com/apache/arrow/pull/9032
This bench compares the behavior of `MutableBuffer` vs allocating `Vec<u8>`
and using `extend_from_slice`.
On my computer:
```
mutable time: [579.24 us 580.21 us 581.34 us]
mutable prepared time: [614.98 us 616.15 us 617.42 us]
from_slice time: [1.2945 ms 1.3262 ms 1.3607 ms]
from_slice prepared time: [1.0161 ms 1.0472 ms 1.0881 ms]
```
I.e. growing a `MutableBuffer` seems to be 2x faster than creating a `Vec`
and using `Buffer::from` to convert it to a `Buffer`.
It is odd that creating a buffer with the correct capacity takes longer,
though. Any ideas @jhorstmann , @Dandandan ?
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