nealrichardson commented on code in PR #43351:
URL: https://github.com/apache/arrow/pull/43351#discussion_r1686458724


##########
r/src/arrow_cpp11.h:
##########
@@ -148,7 +148,7 @@ inline SEXP utf8_strings(SEXP x) {
 
     for (R_xlen_t i = 0; i < n; i++, ++p_x) {
       SEXP s = *p_x;
-      if (s != NA_STRING) {
+      if (s != NA_STRING && ALTREP(s)) {

Review Comment:
   I guess I don't understand what's happening in here. L144 says that this 
should no longer be altrep by the time we get here.



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