jonkeane commented on code in PR #48634:
URL: https://github.com/apache/arrow/pull/48634#discussion_r2643282257
##########
r/src/altrep.cpp:
##########
@@ -1094,10 +1101,11 @@ SEXP MakeAltrepVector(const
std::shared_ptr<ChunkedArray>& chunked_array) {
bool is_arrow_altrep(SEXP x) {
if (ALTREP(x)) {
- SEXP info = ALTREP_CLASS_SERIALIZED_CLASS(ALTREP_CLASS(x));
- SEXP pkg = ALTREP_SERIALIZED_CLASS_PKGSYM(info);
-
- if (pkg == symbols::arrow) return true;
+ return R_altrep_inherits(x, AltrepVectorPrimitive<REALSXP>::class_t) ||
+ R_altrep_inherits(x, AltrepVectorPrimitive<INTSXP>::class_t) ||
+ R_altrep_inherits(x, AltrepFactor::class_t) ||
+ R_altrep_inherits(x, AltrepVectorString<StringType>::class_t) ||
+ R_altrep_inherits(x, AltrepVectorString<LargeStringType>::class_t);
Review Comment:
Maybe, but this check is definitely more fragile — do we have to do this
here? I don't see any of the `ATTRIB` stuff here?
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