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From "Pengcheng Xiong (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-14362) Support explain analyze in Hive
Date Fri, 19 Aug 2016 23:58:20 GMT

     [ https://issues.apache.org/jira/browse/HIVE-14362?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Pengcheng Xiong updated HIVE-14362:
-----------------------------------
    Attachment: HIVE-14362.02.patch

> Support explain analyze in Hive
> -------------------------------
>
>                 Key: HIVE-14362
>                 URL: https://issues.apache.org/jira/browse/HIVE-14362
>             Project: Hive
>          Issue Type: New Feature
>            Reporter: Pengcheng Xiong
>            Assignee: Pengcheng Xiong
>         Attachments: HIVE-14362.01.patch, HIVE-14362.02.patch, compare_on_cluster.pdf
>
>
> Right now all the explain levels only support stats before query runs. We would like
to have an explain analyze similar to Postgres for real stats after query runs. This will
help to identify the major gap between estimated/real stats and make not only query optimization
better but also query performance debugging easier.



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