tustvold commented on code in PR #1832:
URL: https://github.com/apache/arrow-rs/pull/1832#discussion_r894284163
##########
arrow/src/compute/kernels/substring.rs:
##########
@@ -182,24 +182,66 @@ pub fn substring_by_char<OffsetSize: OffsetSizeTrait>(
start: i64,
length: Option<u64>,
) -> Result<GenericStringArray<OffsetSize>> {
- Ok(array
- .iter()
- .map(|val| {
- val.map(|val| {
- let char_count = val.chars().count();
- let start = if start >= 0 {
- start.to_usize().unwrap().min(char_count)
- } else {
- char_count - (-start).to_usize().unwrap().min(char_count)
- };
- let length = length.map_or(char_count - start, |length| {
- length.to_usize().unwrap().min(char_count - start)
- });
+ let mut vals = BufferBuilder::<u8>::new(array.value_data().len());
+ let mut offsets = BufferBuilder::<OffsetSize>::new(array.len() + 1);
+ offsets.append(OffsetSize::zero());
+ let length = length.map(|len| len.to_usize().unwrap());
+
+ array.iter().for_each(|val| {
+ if let Some(val) = val {
+ let char_count = val.chars().count();
+ let start = if start >= 0 {
+ start.to_usize().unwrap()
Review Comment:
The rationale is likely that there is only one possible error variant, and
so it is up to the caller to add this context in the manner appropriate to how
they have chosen to handle errors - be it panic, anyhow, custom error
enumerations, etc...
As for the semantics on ArrowNativeType, I happen to not be a fan of
returning None for unsupported types - my 2 cents is we should just use
num-traits and not roll our own :sweat_smile:
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