xinlifoobar commented on code in PR #6231:
URL: https://github.com/apache/arrow-rs/pull/6231#discussion_r1721484574
##########
arrow-string/src/predicate.rs:
##########
@@ -117,12 +119,38 @@ impl<'a> Predicate<'a> {
Predicate::Contains(finder) => BooleanArray::from_unary(array,
|haystack| {
finder.find(haystack.as_bytes()).is_some() != negate
}),
- Predicate::StartsWith(v) => BooleanArray::from_unary(array,
|haystack| {
- starts_with(haystack, v, equals_kernel) != negate
- }),
- Predicate::IStartsWithAscii(v) => BooleanArray::from_unary(array,
|haystack| {
- starts_with(haystack, v, equals_ignore_ascii_case_kernel) !=
negate
- }),
+ Predicate::StartsWith(v) => {
+ if let Some(string_view_array) =
array.as_any().downcast_ref::<StringViewArray>() {
+ // Need to construct a new array nevertheless
+ BooleanArray::from(
+ string_view_array
Review Comment:
I move this to `StringViewArray`. Don't do it in `ByteViewArray` because the
creation of **empty slice** is also a performance killer.
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