@Override
  protected PropertySchema schemaOf(String[] keys) {
    return keys.length > 0 && keys.length < SCHEMAS.length ? SCHEMAS[keys.length - 1] : CLAZZ;
  }
1 key is domain, 2 keys is package, 3 or more is clazz.
@param keys the key fragments
@return
standalone-metastore/metastore-common/src/test/java/org/apache/hadoop/hive/metastore/properties/JavaTestManager.java