docs: public static double getLPNormP(AbstractMaterializeKNNPreprocessor<?> kNN) {
      DistanceFunction<?> distanceFunction = kNN.getDistanceQuery().getDistanceFunction();
      if(LPNormDistanceFunction.class.isInstance(distanceFunction)) {
        return ((LPNormDistanceFunction) distanceFunction).getP();
      }
      return Double.NaN;
    }