yordan-pavlov commented on a change in pull request #1248:
URL: https://github.com/apache/arrow-rs/pull/1248#discussion_r799061079
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File path: arrow/src/buffer/mutable.rs
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@@ -475,35 +475,36 @@ impl MutableBuffer {
let (_, upper) = iterator.size_hint();
let upper = upper.expect("from_trusted_len_iter requires an upper
limit");
- let mut result = {
- let byte_capacity: usize = upper.saturating_add(7) / 8;
- MutableBuffer::new(byte_capacity)
- };
+ let aligned_len = bit_util::ceil(upper, 64) * 8;
+ let mut result = MutableBuffer::new(aligned_len);
'a: loop {
- let mut byte_accum: u8 = 0;
- let mut mask: u8 = 1;
+ let mut accum: u64 = 0;
Review comment:
that's interesting - I am curious @tustvold have you measured the
impact just from this change (from u8 to u64 accumulator) ?
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