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From "kalyan ram (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-2478) Support dry run option in hive
Date Wed, 05 Oct 2011 12:38:34 GMT

    [ https://issues.apache.org/jira/browse/HIVE-2478?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13120890#comment-13120890
] 

kalyan ram commented on HIVE-2478:
----------------------------------

Yes we can use EXPLAIN as well. In MySql older versions for some queries having sub queries
<explain> was executing the sub queries so I was thinking on those terms. So in Hive
is it that we never execute the query if EXPLAIN is present ? This feature might still be
useful in remote cases where you can't go and change your queries. For example if you want
to check if your queries will work against a new version of hive we can set this property
and check without modifying the query.
                
> Support dry run option in hive
> ------------------------------
>
>                 Key: HIVE-2478
>                 URL: https://issues.apache.org/jira/browse/HIVE-2478
>             Project: Hive
>          Issue Type: Improvement
>          Components: Configuration
>    Affects Versions: 0.9.0
>            Reporter: kalyan ram
>            Priority: Minor
>         Attachments: HIVE-2478-1.patch
>
>
> Hive currently doesn't support a dry run option. For some complex queries we just want
to verify the query syntax initally before running it. A dry run option where just the parsing
is done without actual execution is a good option.

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