presto-hive/src/main/java/io/prestosql/plugin/hive/security/SqlStandardAccessControlMetadata.java/SqlStandardAccessControlMetadata/listEnabledRoles
class SqlStandardAccessControlMetadata:    @Override
    public Set<String> listEnabledRoles(ConnectorSession session)
    {
        return ThriftMetastoreUtil.listEnabledRoles(session.getIdentity(), metastore::listRoleGrants)
                .collect(toImmutableSet());
    }