wgtmac commented on code in PR #34961:
URL: https://github.com/apache/arrow/pull/34961#discussion_r1164904468


##########
cpp/src/arrow/testing/random.cc:
##########
@@ -916,14 +916,14 @@ std::shared_ptr<Array> 
RandomArrayGenerator::ArrayOf(const Field& field, int64_t
 
     case Type::type::STRUCT: {
       ArrayVector child_arrays(field.type()->num_fields());
-      std::vector<std::string> field_names;
+      FieldVector child_fields;
       for (int i = 0; i < field.type()->num_fields(); i++) {
         const auto& child_field = field.type()->field(i);
         child_arrays[i] = ArrayOf(*child_field, length, alignment, 
memory_pool);
-        field_names.push_back(child_field->name());
+        child_fields.push_back(child_field);
       }
       return *StructArray::Make(
-          child_arrays, field_names,
+          child_arrays, child_fields,

Review Comment:
   I just realized that `DataType` does not know the nullability but `Field` 
does. Thanks for reminding me! @lidavidm 



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