[jira] Updated: (PIG-993) [zebra] Abitlity to drop a column group in a table

["Raghu Angadi (JIRA)" <ji...@apache.org>]

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

Raghu Angadi updated PIG-993:
-----------------------------

    Attachment: zebra-drop-cg.patch
                DropColumnGroupExample.java

Attachments ; 

  DropColumnGropuExample.java : a simple example to illustrate the functionality.

  zebra-drop-cg.patch : This patch would apply only after a patch for PIG-896.
    
  Some of the tests included there are written by Jing Huang. Jing also helped with testing the patchon real clusters with various errors. Yan Zhou helped with correctly handling missing column groups.



> [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: 0.5.0
>
>         Attachments: DropColumnGroupExample.java, 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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