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From "stack (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-1608) [HbaseShell] Relational Algrebra Operators
Date Mon, 08 Oct 2007 23:33:51 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-1608?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12533227
] 

stack commented on HADOOP-1608:
-------------------------------

Ignore comment above where I say it does not add new operators to the shell -- I see now that
it does.

> [HbaseShell] Relational Algrebra Operators
> ------------------------------------------
>
>                 Key: HADOOP-1608
>                 URL: https://issues.apache.org/jira/browse/HADOOP-1608
>             Project: Hadoop
>          Issue Type: Improvement
>          Components: contrib/hbase
>         Environment: All environments 
>            Reporter: Edward Yoon
>            Priority: Minor
>             Fix For: 0.16.0
>
>         Attachments: patch_v01.txt, patch_v02.txt, patch_v03.txt, patch_v04.txt, patch_v05.txt,
patch_v06.txt
>
>
> Development of relational algebra operators has begun.
>  * Projection 
>   ** selects a subset of the columnfamilies of a relation  
>   ** Result = π ~column_list~ (Relation) 
> {code}
> Hbase > Result = Relation.Projection('year','legnth');
> Hbase > save Result into table('result');
> {code}
>  * Selection
>   ** See : HADOOP-2003 issue's description
> {code}
> Hbase> Result = Relation.Selection(length > 100 and studioName = 'Fox'); 
> Hbase> save Result into table('result');
> {code}
>  * Product 
>  * Rename
>  * Group
>  * Sort

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