presto-hive/src/main/java/io/prestosql/plugin/hive/security/SqlStandardAccessControl.java/SqlStandardAccessControl/checkCanShowRoles
class SqlStandardAccessControl:    @Override
    public void checkCanShowRoles(ConnectorSecurityContext context, String catalogName)
    {
        if (!isAdmin(context)) {
            denyShowRoles(catalogName);
        }
    }