pitrou commented on code in PR #45869:
URL: https://github.com/apache/arrow/pull/45869#discussion_r2154134575


##########
cpp/src/arrow/util/bitmap_ops.cc:
##########
@@ -394,6 +394,31 @@ Result<std::shared_ptr<Buffer>> BitmapOp(MemoryPool* pool, 
const uint8_t* left,
 
 }  // namespace
 
+Result<std::shared_ptr<Buffer>> OptionalBitmapAnd(MemoryPool* pool,
+                                                  const 
std::shared_ptr<Buffer>& left,
+                                                  int64_t left_offset,
+                                                  const 
std::shared_ptr<Buffer>& right,
+                                                  int64_t right_offset, 
int64_t length,
+                                                  int64_t out_offset) {
+  if (left == nullptr && right == nullptr) {
+    return nullptr;
+  } else if (left == nullptr) {
+    if (right_offset == out_offset) {
+      return right;
+    }

Review Comment:
   We could easily slice the input buffer if both offsets are equal modulo 8. 
It would avoid copying in slightly more cases.



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