romainfrancois commented on a change in pull request #11369:
URL: https://github.com/apache/arrow/pull/11369#discussion_r752046159
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File path: r/src/altrep.cpp
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@@ -215,9 +219,10 @@ struct AltrepVectorPrimitive : public
AltrepVectorBase<AltrepVectorPrimitive<sex
// The value at position i
static c_type Elt(SEXP alt, R_xlen_t i) {
- const auto& array = GetArray(alt);
- return array->IsNull(i) ? cpp11::na<c_type>()
- : array->data()->template GetValues<c_type>(1)[i];
+ auto array = GetChunkedArray(alt)->Slice(i, 1)->chunk(0);
Review comment:
Thanks. I added this helper struct:
```cpp
struct ArrayResolve {
ArrayResolve(const std::shared_ptr<ChunkedArray>& chunked_array, int64_t
i) {
for (int idx_chunk = 0; idx_chunk < chunked_array->num_chunks();
idx_chunk++) {
std::shared_ptr<Array> chunk = chunked_array->chunk(idx_chunk);
auto chunk_size = chunk->length();
if (i < chunk_size) {
index_ = i;
array_ = chunk;
break;
}
i -= chunk_size;
}
}
std::shared_ptr<Array> array_;
int64_t index_;
};
```
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