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https://issues.apache.org/jira/browse/HIVE-20842?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Vineet Garg updated HIVE-20842:
-------------------------------
    Status: Open  (was: Patch Available)

> Fix logic introduced in HIVE-20660 to estimate statistics for group by
> ----------------------------------------------------------------------
>
>                 Key: HIVE-20842
>                 URL: https://issues.apache.org/jira/browse/HIVE-20842
>             Project: Hive
>          Issue Type: Bug
>          Components: Statistics
>    Affects Versions: 4.0.0
>            Reporter: Vineet Garg
>            Assignee: Vineet Garg
>            Priority: Major
>         Attachments: HIVE-20842.1.patch, HIVE-20842.2.patch, 
> HIVE-20842.3.patch, HIVE-20842.4.patch, HIVE-20842.5.patch
>
>
> HIVE-20660 introduced better estimation for group by operator. But the logic 
> did not account for Partial and Full group by separately.
> For partial group by parallelism (i.e. number of tasks) should be taken into 
> account.



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