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Posted to issues@hive.apache.org by "Zoltan Haindrich (Jira)" <ji...@apache.org> on 2020/02/27 09:40:00 UTC

[jira] [Assigned] (HIVE-22939) Datasketches support

     [ https://issues.apache.org/jira/browse/HIVE-22939?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Zoltan Haindrich reassigned HIVE-22939:
---------------------------------------


> Datasketches support
> --------------------
>
>                 Key: HIVE-22939
>                 URL: https://issues.apache.org/jira/browse/HIVE-22939
>             Project: Hive
>          Issue Type: Improvement
>            Reporter: Zoltan Haindrich
>            Assignee: Zoltan Haindrich
>            Priority: Major
>
> We could probably integrate with the Datasketches  more closely; it has very usefull alogrithms which could utilized various ways:
> * provide an optional way to transparently rewrite count(distinct) to use some distinct counting sketch
> * fequent items could be gathered during statistics collection; knowing the most frequent elements could extremely helpfull in giving more accurate estimates for our plans
> * and...it also has a way to estimate a CDF function; which might be usefull in giving better estimates for range queries
> https://datasketches.apache.org/



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