vr =  subnoderelation;
vr =  subnoderelation.makeClone ();
    public Relation getGroupbySubnodeRelation () {	if (groupby == null)	    throw new RuntimeException ("getGroupbyPropertyRelation called on non-group-by relation");	Relation vr = null;	if (subnoderelation != null)	    vr =  subnoderelation;	else	    vr =  new Relation (other, localField, remoteField, direction, subnodesAreProperties);	vr.order = order;	vr.prototype = groupbyprototype;	return vr;    }