@Override
  public HiveAuthorizationTranslator getHiveAuthorizationTranslator() throws HiveAuthzPluginException {
    // No customization of this API is done for most Authorization implementations. It is meant 
    // to be used for special cases in Apache Sentry (incubating)
    // null is to be returned when no customization is needed for the translator
    // see javadoc in interface for details.
    return null;
  }
Abstract class that extends HiveAuthorizer. This will help to shield
Hive authorization implementations from some of the changes to HiveAuthorizer
interface by providing default implementation of new methods in HiveAuthorizer
when possible.
ql/src/java/org/apache/hadoop/hive/ql/security/authorization/plugin/AbstractHiveAuthorizer.java