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Posted to issues@hive.apache.org by "Vineet Garg (JIRA)" <ji...@apache.org> on 2018/10/30 21:34:00 UTC

[jira] [Updated] (HIVE-20842) Fix logic introduced in HIVE-20660 to estimate statistics for group by

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

Vineet Garg updated HIVE-20842:
-------------------------------
    Attachment: HIVE-20842.1.patch

> 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-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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