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Yan Zhou updated PIG-986: ------------------------- Attachment: ColumnGroupName.patch Must be applied after the patch for Jira 991 is applied. > [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 > > > 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. -- This message is automatically generated by JIRA. - You can reply to this email to add a comment to the issue online.