alamb commented on code in PR #16087:
URL: https://github.com/apache/datafusion/pull/16087#discussion_r2096115219
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datafusion/functions/src/string/ascii.rs:
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@@ -103,19 +103,22 @@ impl ScalarUDFImpl for AsciiFunc {
fn calculate_ascii<'a, V>(array: V) -> Result<ArrayRef, ArrowError>
where
- V: ArrayAccessor<Item = &'a str>,
+ V: StringArrayType<'a, Item = &'a str>,
{
- let iter = ArrayIter::new(array);
- let result = iter
- .map(|string| {
- string.map(|s| {
- let mut chars = s.chars();
- chars.next().map_or(0, |v| v as i32)
- })
+ let values: Vec<_> = (0..array.len())
+ .map(|i| {
+ if array.is_null(i) {
+ 0
Review Comment:
It would be legal. I am not sure it would be faster, though we could easily
check with a benchmark once this PR is merged
We could at least add a check on the outside of the loop
```rust
// If the array has no nulls, skip checking each value
if array.null_count() == 0 {
let values: Vec<_> = (0..array.len())....
}
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