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From "dhruba borthakur (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-4084) Add explain plan capabilities to Hive QL
Date Thu, 18 Sep 2008 17:38:44 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-4084?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

dhruba borthakur updated HADOOP-4084:

    Resolution: Fixed
        Status: Resolved  (was: Patch Available)

I just committed this. Thanks Ashish!

> Add explain plan capabilities to Hive QL
> ----------------------------------------
>                 Key: HADOOP-4084
>                 URL: https://issues.apache.org/jira/browse/HADOOP-4084
>             Project: Hadoop Core
>          Issue Type: New Feature
>          Components: contrib/hive
>            Reporter: Ashish Thusoo
>            Assignee: Ashish Thusoo
>             Fix For: 0.19.0
>         Attachments: patch-4084, patch-4084, patch-4084_v3
> Adding explain plan for queries in hive.
> The current proposal is to support something like:
> SELECT ....
> This will output the following:
> Abstract Syntax Tree:
> Number of Stages:
> Dependencies between Stages:
> Plan for each stage:
> If EXTENDED keyword is used then much more information will be emitted where as without
that keyword only logical information will be emitted.
> e.g. In case of a group by query 
> SELECT T.c1, count(1) FROM T GROUP BY T.c1;
> The explain plan itself has two stages
> Stage1 and Stage2
> Stage1 will have the plan for generating the partial aggregates
> and Stage2 will have the plan for generating the complete aggregates.
> I also plan to convert the parse and semantic analysis tests so that they use this for
finding differences in the plan instead of the programmatic plan dumps that we are using today

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