tustvold commented on code in PR #2591:
URL: https://github.com/apache/arrow-rs/pull/2591#discussion_r955754295
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arrow/src/compute/kernels/comparison.rs:
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@@ -260,17 +259,21 @@ pub fn like_utf8_scalar<OffsetSize: OffsetSizeTrait>(
// fast path, can use starts_with
let starts_with = &right[..right.len() - 1];
for i in 0..left.len() {
- if left.value(i).starts_with(starts_with) {
- bit_util::set_bit(bool_slice, i);
+ unsafe {
+ if left.value_unchecked(i).starts_with(starts_with) {
+ bit_util::set_bit(bool_slice, i);
+ }
}
}
} else if right.starts_with('%') && !right[1..].contains(is_like_pattern) {
// fast path, can use ends_with
let ends_with = &right[1..];
for i in 0..left.len() {
- if left.value(i).ends_with(ends_with) {
- bit_util::set_bit(bool_slice, i);
+ unsafe {
+ if left.value_unchecked(i).ends_with(ends_with) {
+ bit_util::set_bit(bool_slice, i);
Review Comment:
Not something for this PR but using MutableBuffer::from_trusted_len_iter may
be significantly faster as it performs byte-size writes instead bit
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