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From "Navis (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HIVE-8397) Approximated cardinality with HuperLogLog UDAF
Date Wed, 08 Oct 2014 09:00:43 GMT
Navis created HIVE-8397:
---------------------------

             Summary: Approximated cardinality with HuperLogLog UDAF
                 Key: HIVE-8397
                 URL: https://issues.apache.org/jira/browse/HIVE-8397
             Project: Hive
          Issue Type: Improvement
          Components: UDF
            Reporter: Navis
            Assignee: Navis
            Priority: Trivial


Useful sometimes for quick estimation of bulk data. 
{noformat}
select hll(key), hll(value) from src;
{noformat}

Also can be used with hive.fetch.task.aggr=true;




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