@Override
  protected int getMapNameLength(String[] keys) {
    return SCHEMAS.length;
  }
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