public void setCount(long count) {
    this.cachedCount = count;
    this.invalidateCount = true;
  }
Estimate bias from lookup table
@param count
         - cardinality before bias correction
@return cardinality after bias correction
standalone-metastore/metastore-server/src/main/java/org/apache/hadoop/hive/common/ndv/hll/HyperLogLog.java