jhorstmann commented on a change in pull request #716:
URL: https://github.com/apache/arrow-rs/pull/716#discussion_r697322266
##########
File path: arrow/src/array/transform/utils.rs
##########
@@ -35,15 +42,37 @@ pub(super) fn set_bits(
offset_read: usize,
len: usize,
) -> usize {
- let mut count = 0;
- (0..len).for_each(|i| {
- if bit_util::get_bit(data, offset_read + i) {
- bit_util::set_bit(write_data, offset_write + i);
- } else {
- count += 1;
- }
+ let mut null_count = 0;
+
+ let mut bits_to_align = offset_write % 8;
+ if bits_to_align > 0 {
+ bits_to_align = std::cmp::min(len, 8 - bits_to_align);
+ }
+ let mut byte_index = ceil(offset_write + bits_to_align, 8);
+
+ // Set full bytes provided by bit chunk iterator
+ let chunks = BitChunks::new(data, offset_read + bits_to_align, len -
bits_to_align);
+ chunks.iter().for_each(|chunk| {
+ null_count += chunk.count_zeros();
+ chunk.to_ne_bytes().iter().for_each(|b| {
Review comment:
I think this needs to use `to_le_bytes`, for example see the comments in
`ops.rs`, `bitwise_bin_op_helper` (which has some typos):
// we are counting bits starting from the least significant bit, so
to_le_bytes should be correct
--
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.
To unsubscribe, e-mail: [email protected]
For queries about this service, please contact Infrastructure at:
[email protected]
