kou commented on a change in pull request #11674:
URL: https://github.com/apache/arrow/pull/11674#discussion_r748978283



##########
File path: cpp/src/arrow/array/array_nested.cc
##########
@@ -680,7 +680,7 @@ Result<std::shared_ptr<Array>> 
SparseUnionArray::GetFlattenedField(
   if (child_null_bitmap) {
     BitmapAnd(flattened_null_bitmap->data(), child_offset, 
child_null_bitmap->data(),
               child_offset, child_data->length, child_offset,
-              flattened_null_bitmap->mutable_data());
+              flattened_null_bitmap->mutable_data(), /*out pop count*/ 
nullptr);

Review comment:
       I'm not sure that the problem case correctly but I think that there are 
no problem with default parameter.
   (Is this ABI compatibility problem?)
   Because we increase major version for each release.




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