jonkeane commented on code in PR #43351:
URL: https://github.com/apache/arrow/pull/43351#discussion_r1689783264


##########
r/src/arrow_cpp11.h:
##########
@@ -152,6 +157,9 @@ inline SEXP utf8_strings(SEXP x) {
         SET_STRING_ELT(x, i, Rf_mkCharCE(Rf_translateCharUTF8(s), CE_UTF8));

Review Comment:
   Something like this from above? 
   
   SEXP new_s = Rf_translateCharUTF8(s);
   if (new_s == s) {
       SET_STRING_ELT(x, i, Rf_mkCharCE(new_s, CE_UTF8));
   }
   
   Yeah, that's probably good. It'll also make this slightly more inline with 
what was there before (checking that not utf8)



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