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From "Vineet Garg (JIRA)" <j...@apache.org>
Subject [jira] [Assigned] (HIVE-20842) Fix logic introduced in HIVE-20660 to estimate statistics for group by
Date Tue, 30 Oct 2018 21:30:00 GMT

     [ https://issues.apache.org/jira/browse/HIVE-20842?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Vineet Garg reassigned HIVE-20842:
----------------------------------


> 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
>
> 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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