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