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From "Yan Zhou (JIRA)" <j...@apache.org>
Subject [jira] Updated: (PIG-993) [zebra] Abitlity to drop a column group in a table
Date Mon, 12 Oct 2009 16:59:31 GMT

     [ https://issues.apache.org/jira/browse/PIG-993?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Yan Zhou updated PIG-993:
-------------------------

    Attachment: zebra_drop_cg.patch

This new version  of patch is needed due to the upstream changes in Pig-992. Although this
Jira is functionally independent of Pig-992, but the application sequence of the patches must
be honored.

> [zebra] Abitlity to drop a column group in a table
> --------------------------------------------------
>
>                 Key: PIG-993
>                 URL: https://issues.apache.org/jira/browse/PIG-993
>             Project: Pig
>          Issue Type: Bug
>            Reporter: Raghu Angadi
>            Assignee: Raghu Angadi
>             Fix For: 0.6.0
>
>         Attachments: DropColumnGroupExample.java, zebra-drop-cg.patch, zebra-drop-cg.patch
>
>
> A Zebra table is stored as multiple sub tables each containing a set of columns called
column group (CG). The user specifies how these columns are grouped while creating a table
through the _storage hint_.
> For some of the large tables, it might be necessary for users to remove a set of columns
and retain the rest. This jira provides a way for users to delete an entire column group.

> The following comments will have more details on API and the semantics. 

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