pitrou commented on a change in pull request #10317:
URL: https://github.com/apache/arrow/pull/10317#discussion_r632636762
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File path: cpp/src/arrow/compute/kernels/scalar_string.cc
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@@ -266,6 +266,52 @@ void EnsureLookupTablesFilled() {}
#endif // ARROW_WITH_UTF8PROC
+template <typename Type>
+struct AsciiReverse : StringTransform<Type, AsciiReverse<Type>> {
+ using Base = StringTransform<Type, AsciiReverse<Type>>;
+ using offset_type = typename Base::offset_type;
+
+ bool Transform(const uint8_t* input, offset_type input_string_ncodeunits,
+ uint8_t* output, offset_type* output_written) {
+ uint8_t utf8_char_found = 0;
+ for (offset_type i = 0; i < input_string_ncodeunits; i++) {
+ // if a utf8 char is found, report to utf8_char_found
+ utf8_char_found |= input[i] & 0x80;
Review comment:
The ASCII version would produce invalid output for valid (but non-ASCII)
input, which is why it checks for ASCII validity. Invalid input is a different
situation which we don't need to check for.
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