edponce commented on a change in pull request #10869:
URL: https://github.com/apache/arrow/pull/10869#discussion_r698428601
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File path: cpp/src/arrow/compute/kernels/scalar_string.cc
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@@ -496,29 +493,22 @@ template <typename Type>
using UTF8SwapCase =
StringTransformExec<Type, StringTransformCodepoint<UTF8SwapCaseTransform>>;
-struct Utf8CapitalizeTransform : public StringTransformBase {
+struct Utf8CapitalizeTransform : public StringTransformCodepointBase {
int64_t Transform(const uint8_t* input, int64_t input_string_ncodeunits,
uint8_t* output) {
uint8_t* output_start = output;
- if (input_string_ncodeunits > 0) {
Review comment:
No. Nevertheless, even with the check, `util::UTF8AdvanceCodepoints` can
buffer overflow because it is not constrained by a given size but by the
detection of an invalid code unit.
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