private List<MDBPrivilege> listPrincipalMDBGrants(String principalName,
      PrincipalType principalType, String catName, String dbName) {
    return listPrincipalMDBGrants(principalName, principalType, catName, dbName, null);
  }
Add role names of parentRoles and its parents to processedRoles
standalone-metastore/metastore-server/src/main/java/org/apache/hadoop/hive/metastore/ObjectStore.java