presto-hive/src/main/java/io/prestosql/plugin/hive/metastore/thrift/BridgingHiveMetastore.java/BridgingHiveMetastore/listRoleGrants
class BridgingHiveMetastore:    @Override
    public Set<RoleGrant> listRoleGrants(HivePrincipal principal)
    {
        return delegate.listRoleGrants(principal);
    }