thisisnic commented on code in PR #48634:
URL: https://github.com/apache/arrow/pull/48634#discussion_r2642330597
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r/src/altrep.cpp:
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@@ -574,11 +575,10 @@ struct AltrepFactor : public
AltrepVectorBase<AltrepFactor> {
// the representation integer vector
SEXP dup = PROTECT(Rf_shallow_duplicate(Materialize(alt)));
- // additional attributes from the altrep
- SEXP atts = PROTECT(Rf_duplicate(ATTRIB(alt)));
- SET_ATTRIB(dup, atts);
+ // copy attributes from the altrep object
+ DUPLICATE_ATTRIB(dup, alt);
- UNPROTECT(2);
+ UNPROTECT(1);
Review Comment:
> 🤖 Note: DUPLICATE_ATTRIB also copies the OBJECT bit and S4 status, which
the old code didn't do.
Was unsure if this matters?
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