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Based on Google's HyperLogLog++ paper. Uses a bias correcting interpolation as a sub algorithm for Hll estimates within a specific range. Change-Id: If4fe692b4308f6a57aea6167e9bc00db11eaaab9 Reviewed-on: http://gerrit.cloudera.org:8080/415 Tested-by: Internal Jenkins Reviewed-by: Henry Robinson <henry@cloudera.com>