return getWorkName((SIRFilter)oper,id);
return ClusterUtils.getWorkName((SIRFilter)oper,id);
    private static String get_work_function(SIROperator oper) {	int id = NodeEnumerator.getSIROperatorId(oper);		if (oper instanceof SIRFilter) {	    return getWorkName((SIRFilter)oper,id);	}		    	if (oper instanceof SIRSplitter) {	    return "__splitter_"+id+"_work";	}		if (oper instanceof SIRJoiner) {	    return "__joiner_"+id+"_work";	}	assert (1 == 0);	return null;    }