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From "Zheng Shao (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HIVE-805) Session level metastore
Date Thu, 04 Feb 2010 06:42:28 GMT

    [ https://issues.apache.org/jira/browse/HIVE-805?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12829476#action_12829476
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Zheng Shao commented on HIVE-805:
---------------------------------

As with my last comment, I think we should interpret the option "hive.metastore.dryrun" at
compile time instead of at execution time.
It should be compiled into the plan.

The execution code can look at the plan and then decide which metastore to "create" the table
in.

Now with "view" in, we should also make it work for views.


> Session level metastore
> -----------------------
>
>                 Key: HIVE-805
>                 URL: https://issues.apache.org/jira/browse/HIVE-805
>             Project: Hadoop Hive
>          Issue Type: New Feature
>          Components: Query Processor
>    Affects Versions: 0.6.0
>            Reporter: Ashish Thusoo
>            Assignee: Ashish Thusoo
>         Attachments: HIVE-805-1.patch, HIVE-805.patch
>
>
> Implement a shadow metastore that is in memory and runs for a session. This can contain
definitions for session specific views that can be used to implement data flow variables in
Hive. It can also be used for testing scripts. First we will support the later use case where
in all the DDL statements in the session create objects in the session metastore and all the
queries are converted to explain internal. Any thoughts on load commands?
> This feature is enabled when
> set hive.session.test = true
> is done in the session.

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