Raghu Angadi updated PIG-986:

    Status: Patch Available  (was: Open)

> [zebra] Zebra Column Group Naming Support
> -----------------------------------------
>                 Key: PIG-986
>                 URL: https://issues.apache.org/jira/browse/PIG-986
>             Project: Pig
>          Issue Type: New Feature
>          Components: impl
>    Affects Versions: 0.4.0
>            Reporter: Chao Wang
>            Assignee: Chao Wang
>             Fix For: 0.6.0
>         Attachments: ColumnGroupName.patch, ColumnGroupName.patch, 
> ColumnGroupName.patch
> We introduce column group name to Zebra and make it a first-class citizen in 
> Zebra. This can ease management of column groups.
> We plan to introduce an "as" clause for column group name in Zebra's syntax.
> Functional Specifications:
> 1) Column group names are optional. For column groups which do not have a 
> user-provided name, Zebra will assign some default column group names 
> internally that is unique for that table - CG0, CG1, CG2 ... Note: If CGx is 
> used by user, then it can not be used for internal names.
> 2) We introduce an "AS" clause in Zebra's syntax for column group names. If 
> it occurs, it has to immediately follow [ ]. For example, "[a1, a2] as PI 
> secure by user:joe group:secure perm:640; [a3, a4] as General compress by 
> lzo". Note that keyword "AS" is case insensitive.
> 3) Column group names are unique within one table and are case sensitive, 
> i.e., c1 and C1 are different.
> 4) Column group names will be used as the physical column group directory 
> path names.
> 5) Zebra V2 will support dropColumnGroup by column group names (will 
> integrate with Raghu's A29 drop column work).
> 6) Zebra V2 can support backward compatibility (If there are Zebra V1 created 
> tables in production when V2 is released). More specifically, this means that 
> Zebra V2 can load from V1-created tables and do dropColumnGroup on it.
> 7) Does NOT support renaming.

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