HuaHuaY commented on code in PR #50281:
URL: https://github.com/apache/arrow/pull/50281#discussion_r3636617001


##########
cpp/src/arrow/util/bit_run_reader.h:
##########
@@ -536,5 +544,93 @@ inline void VisitSetBitRunsVoid(const 
std::shared_ptr<Buffer>& bitmap, int64_t o
                       std::forward<Visit>(visit));
 }
 
+template <typename Visit>
+inline Status VisitTwoSetBitRuns(const uint8_t* left_bitmap, int64_t 
left_offset,
+                                 const uint8_t* right_bitmap, int64_t 
right_offset,
+                                 int64_t length, Visit&& visit,
+                                 MemoryPool* pool = default_memory_pool()) {

Review Comment:
   Previously, we allocated memory for bitmap using this pool. Now bitmap uses 
stack space. I will remove this parameter.



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