hollow/src/main/java/com/netflix/hollow/tools/diff/count/HollowFieldDiff.java
@Override
    public int compareTo(HollowFieldDiff o) {
        if(o.getTotalDiffScore() > totalDiffScore)
            return 1;
        else if(o.getTotalDiffScore() < totalDiffScore)
            return -1;
        return 0;
    }
@Override
    public int compareTo(HollowFieldDiff o) {
        if(o.getTotalDiffScore() > totalDiffScore)
            return 1;
        else if(o.getTotalDiffScore() < totalDiffScore)
            return -1;
        return 0;
    }
Comparison is based on the totalDiffScore().