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Posted to dev@hive.apache.org by "Navis (JIRA)" <ji...@apache.org> on 2014/10/08 11:00:44 UTC

[jira] [Updated] (HIVE-8397) Approximated cardinality with HyperLogLog UDAF

     [ https://issues.apache.org/jira/browse/HIVE-8397?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Navis updated HIVE-8397:
------------------------
    Summary: Approximated cardinality with HyperLogLog UDAF  (was: Approximated cardinality with HuperLogLog UDAF)

> Approximated cardinality with HyperLogLog 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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