public boolean revokePrivileges(PrivilegeBag privileges, boolean grantOption)
      throws HiveException {
    try {
      return getMSC().revoke_privileges(privileges, grantOption);
    } catch (Exception e) {
      throw new HiveException(e);
    }
  }
@param privileges
         a bag of privileges
@return true on success
@throws HiveException
ql/src/java/org/apache/hadoop/hive/ql/metadata/Hive.java