@Override public String format(Object value) {
      if (value instanceof Long) {
        return String.valueOf(value);
      }
      return null;
    }
Reads a value according to this type.
@param in a data input
@return an instance of a value for the type or null
standalone-metastore/metastore-common/src/main/java/org/apache/hadoop/hive/metastore/properties/PropertyType.java