public static KllHistogramEstimator getEmptyHistogramEstimator(int k) {
    return new KllHistogramEstimator(k);
  }
This method creates an empty histogram estimator with a KLL sketch of a given k parameter.
@param k the KLL parameter k for initializing the sketch
@return an empty histogram estimator with a KLL sketch of a given k parameter
standalone-metastore/metastore-server/src/main/java/org/apache/hadoop/hive/common/histogram/KllHistogramEstimatorFactory.java