viirya commented on code in PR #19571:
URL: https://github.com/apache/datafusion/pull/19571#discussion_r2678122479
##########
datafusion/functions/src/unicode/left.rs:
##########
@@ -139,14 +139,23 @@ fn left_impl<'a, T: OffsetSizeTrait, V:
ArrayAccessor<Item = &'a str>>(
n_array: &Int64Array,
) -> Result<ArrayRef> {
let iter = ArrayIter::new(string_array);
+ let mut chars_buf = Vec::new();
let result = iter
.zip(n_array.iter())
.map(|(string, n)| match (string, n) {
(Some(string), Some(n)) => match n.cmp(&0) {
Ordering::Less => {
- let len = string.chars().count() as i64;
- Some(if n.abs() < len {
- string.chars().take((len + n) as
usize).collect::<String>()
+ // Collect chars once and reuse for both count and take
Review Comment:
Yea, let me merge it first and probably improve it later.
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