AlenkaF commented on code in PR #41757:
URL: https://github.com/apache/arrow/pull/41757#discussion_r1625681045


##########
cpp/src/arrow/array/array_nested.cc:
##########
@@ -827,6 +827,15 @@ Result<std::shared_ptr<Array>> 
MapArray::FromArraysInternal(
     return Status::Invalid("Map key and item arrays must be equal length");
   }
 
+  if (null_bitmap != nullptr && offsets->null_count() > 0) {

Review Comment:
   Then we can reuse https://github.com/apache/arrow/issues/38553, will add a 
note there.



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