romainfrancois commented on a change in pull request #11369:
URL: https://github.com/apache/arrow/pull/11369#discussion_r725048745
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File path: r/src/altrep.cpp
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@@ -601,31 +616,41 @@ void Init_Altrep_classes(DllInfo* dll) {
// return an altrep R vector that shadows the array if possible
SEXP MakeAltrepVector(const std::shared_ptr<ChunkedArray>& chunked_array) {
+ // using altrep if
+ // - the arrow.use_altrep is set to TRUE or unset (implicit TRUE)
+ // - the chunked array has at least one element
+ if (!arrow::r::GetBoolOption("arrow.use_altrep", true) ||
+ chunked_array->length() == 0) {
+ return R_NilValue;
+ }
+
// special case when there is only one array
if (chunked_array->num_chunks() == 1) {
Review comment:
This is temporary, these cases will move to the general switch below,
once `altrep::AltrepVectorPrimitive` can deal with multiple chunks.
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