You are viewing a plain text version of this content. The canonical link for it is here.

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

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

Zoltan Haindrich created HIVE-22939:
---------------------------------------

             Summary: 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


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/



--
This message was sent by Atlassian Jira
(v8.3.4#803005)