public static KllFloatsSketch deserializeKll(final byte[] buf) {
    return deserializeKll(buf, 0, buf.length);
  }
This function deserializes the serialized KLL sketch from a byte array.
@param buf to deserialize
@return KLL sketch
standalone-metastore/metastore-server/src/main/java/org/apache/hadoop/hive/common/histogram/kll/KllUtils.java