presto-hive/src/main/java/io/prestosql/plugin/hive/HiveMetadata.java/HiveMetadata/createRole
class HiveMetadata:    @Override
    public void createRole(ConnectorSession session, String role, Optional<PrestoPrincipal> grantor)
    {
        accessControlMetadata.createRole(session, role, grantor.map(HivePrincipal::from));
    }