romainfrancois commented on a change in pull request #10730:
URL: https://github.com/apache/arrow/pull/10730#discussion_r672327530



##########
File path: r/src/altrep.cpp
##########
@@ -44,25 +49,58 @@ extern "C" {
 #endif
 
 #include <arrow/array.h>
+#include <arrow/util/bitmap_reader.h>
+
+#include "./r_task_group.h"
 
 namespace arrow {
 namespace r {
 
+template <typename T>
+void UseSentinel(const std::shared_ptr<Array>& array) {

Review comment:
       Also, I believe the second dot will have some code shared with altrep 
for ChunkedArray. 




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