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Posted to issues@hive.apache.org by "Pengcheng Xiong (JIRA)" <ji...@apache.org> on 2016/08/12 18:15:20 UTC

[jira] [Updated] (HIVE-14362) Support explain analyze in Hive

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

Pengcheng Xiong updated HIVE-14362:
-----------------------------------
    Attachment: HIVE-14362.01.patch

initial patch, still some problems. UpdateDelete, columnStats, Index, Masking, any thing involving a new context.

> 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
>
>
> 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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