presto-spi/src/main/java/io/prestosql/spi/connector/ConnectorMetadata.java/ConnectorMetadata/listApplicableRoles
class ConnectorMetadata:    default Set<RoleGrant> listApplicableRoles(ConnectorSession session, PrestoPrincipal principal)
    {
        throw new PrestoException(NOT_SUPPORTED, "This connector does not support roles");
    }