@Override
    public StringBuilder toString(StringBuilder string, SerializationContext context, Deque<String> path, CompositeNode parent) {
        return string.append("(optimized sum of condition trees of size ").append(values.length*8).append(" bytes)");
    }
Returns (optimized sum of condition trees)
searchlib/src/main/java/com/yahoo/searchlib/rankingexpression/evaluation/gbdtoptimization/GBDTForestNode.java