zhjwpku commented on code in PR #760:
URL: https://github.com/apache/iceberg-cpp/pull/760#discussion_r3487781094


##########
src/iceberg/util/string_util.h:
##########
@@ -41,29 +40,46 @@ concept FromChars = requires(const char* p, T& v) { 
std::from_chars(p, p, v); };
 
 class ICEBERG_EXPORT StringUtils {
  public:
-  // NOTE: These convert ASCII letters only; all other bytes, including 
non-ASCII
-  // (multibyte UTF-8) bytes, are passed through unchanged.
-  // See https://github.com/apache/iceberg-cpp/issues/613.
-  static std::string ToLower(std::string_view str) {

Review Comment:
   I think there are quite a few places where ToLower is only used for ASCII 
strings. Should we switch those to use ToUpper? Or should we leave ToLower as 
it is and introduce a new ToLowerUTF8 instead?



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