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From "Ashish Thusoo (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HIVE-463) Add a pre execution hook to ql
Date Mon, 04 May 2009 22:46:30 GMT

     [ https://issues.apache.org/jira/browse/HIVE-463?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Ashish Thusoo updated HIVE-463:
-------------------------------

    Attachment: patch-463_3.txt

Fixed build.xml. The class is only needed in ql and hwi tests.


> Add a pre execution hook to ql
> ------------------------------
>
>                 Key: HIVE-463
>                 URL: https://issues.apache.org/jira/browse/HIVE-463
>             Project: Hadoop Hive
>          Issue Type: New Feature
>          Components: Query Processor
>    Affects Versions: 0.4.0
>            Reporter: Ashish Thusoo
>            Assignee: Ashish Thusoo
>            Priority: Minor
>         Attachments: patch-463.txt, patch-463_2.txt, patch-463_3.txt
>
>
> There may be cases where user defined logic needs to be executed between the compilation
and execution phases of a query. One simple example that we ran into is based on archival.
If an external utility archives table partitions of example, then a plugin logic can check
that for the partitions and take suitable action such as:
> - Unarchiving the partition seemlessly
> - Throwing an error
> etc..
> This same framework can also be used for updating query compilation stats.

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