presto-hive/src/main/java/io/prestosql/plugin/hive/metastore/thrift/ThriftHiveMetastoreClient.java/ThriftHiveMetastoreClient/setUGI
class ThriftHiveMetastoreClient:    @Override
    public void setUGI(String userName)
            throws TException
    {
        client.set_ugi(userName, new ArrayList<>());
    }