docs: public Ordering createNewOrderingUpToIndex(int exclusiveIndex) {
  		if (exclusiveIndex == 0) {
  			return null;
  		}
  		final Ordering newOrdering = new Ordering();
  		for (int i = 0; i < exclusiveIndex; i++) {
  			newOrdering.appendOrdering(this.indexes.get(i), this.types.get(i), this.orders.get(i));
  		}
  		return newOrdering;
  	}