presto-hive/src/main/java/io/prestosql/plugin/hive/authentication/NoHdfsAuthentication.java/NoHdfsAuthentication/doAs
class NoHdfsAuthentication:    @Override
    public <R, E extends Exception> R doAs(String user, GenericExceptionAction<R, E> action)
            throws E
    {
        return action.run();
    }