code: protected boolean isExternal(String namespace, String name) {
      String resolved = resolveNamespace(namespace, name);
      if (resolved != null) {
        return isExternal(getMetaStoreUtil().getTable(resolved, name));
      }
      return false;
    }
docs: Returns whether the table is a managed hive table.
  @param name a Table name
  @return true if the table is managed, false otherwise
  @throws DatasetNotFoundException If the table does not exist in Hive