neilconway commented on code in PR #26377:
URL: https://github.com/apache/datafusion/pull/26377#discussion_r4285614881
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datafusion/functions/src/string/common.rs:
##########
@@ -390,38 +390,48 @@ fn unicode_case(s: &str, lower: bool) -> String {
}
}
-/// Like [`unicode_case`], but uppercases into `buf` so its allocation is
reused
-/// across rows. Lowercasing still allocates, see [`write_unicode_case`].
+/// Appends `s` to `builder` with its case converted.
+///
+/// An ASCII value is converted byte by byte straight into the builder. Other
+/// values go through `str::to_lowercase` / `str::to_uppercase`, which allocate
+/// a `String` but convert any leading run of ASCII bytes in bulk.
#[inline]
-fn unicode_case_into<'a>(s: &str, lower: bool, buf: &'a mut String) -> &'a str
{
- if lower {
- *buf = s.to_lowercase();
- } else {
- buf.clear();
- buf.extend(s.chars().flat_map(char::to_uppercase));
+fn append_case_converted<O: OffsetSizeTrait>(
Review Comment:
I actually started by adding `try_append_byte_map` to
`BulkNullStringArrayBuilder ` originally :) But I felt like the PR was large
enough as it was. I agree this makes sense but I'd prefer to defer to a
followup PR.
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