code: private boolean hasNestedObject(Field field) {
      return field.isStruct()
        || (field.isList() && field.getListElemField().isStruct())
        || (field.isSet() && field.getSetElemField().isStruct())
        || field.isMap();
    }
docs: Determines whether a field is considered to be a nested object based on:
  - whether the field itself is a struct
  - whether the field is a list/set of structs
  - whether field is a Map