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https://issues.apache.org/jira/browse/HIVE-8397?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Navis updated HIVE-8397:
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Attachment: HIVE-8397.2.patch.txt
> 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
> Attachments: HIVE-8397.1.patch.txt, HIVE-8397.2.patch.txt
>
>
> 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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