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From "Vineet Garg (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-20842) Fix logic introduced in HIVE-20660 to estimate statistics for group by
Date Thu, 15 Nov 2018 20:30:00 GMT

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

Vineet Garg updated HIVE-20842:
-------------------------------
    Status: Patch Available  (was: Open)

> 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-20842.10.patch, HIVE-20842.11.patch, HIVE-20842.12.patch,
HIVE-20842.2.patch, HIVE-20842.3.patch, HIVE-20842.4.patch, HIVE-20842.5.patch, HIVE-20842.6.patch,
HIVE-20842.7.patch, HIVE-20842.8.patch, HIVE-20842.9.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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