nealrichardson commented on code in PR #43351:
URL: https://github.com/apache/arrow/pull/43351#discussion_r1688055189
##########
r/src/arrow_cpp11.h:
##########
@@ -138,6 +138,11 @@ inline R_xlen_t r_string_size(SEXP s) {
} // namespace unsafe
inline SEXP utf8_strings(SEXP x) {
+ // ensure that x is not actually altrep first
+ if (ALTREP(x)) {
+ x = PROTECT(Rf_duplicate(x));
+ UNPROTECT(1);
Review Comment:
I'm pretty sure this isn't right, doesn't the `UNPROTECT` need to go after
you're done using the thing you `PROTECT`ed?
I'm also not sure how the C-level PROTECT stuff interacts with
unwind_protect.
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