"Require sj's with height of 1 now.";
"Require sj's with height of 1 now, but" + sj.getIdent() + " has height of " + sj.getRectangularHeight();
    public DPConfigSplitJoin(SIRSplitJoin sj, DynamicProgPartitioner partitioner) {	super(sj, partitioner, wrapInArray(sj.size()), 1);	assert sj.getRectangularHeight()==1:            "Require sj's with height of 1 now.";    }