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Date: Wed, 16 Jan 2013 07:08:12 +0000 (UTC)
From: "Arnab Guin (JIRA)" <jira@apache.org>
To: pig-dev@hadoop.apache.org
Message-ID: <JIRA.12622956.1354908888232.143669.1358320092969@arcas>
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References: <JIRA.12622956.1354908888232@arcas>
Subject: [jira] [Updated] (PIG-3083) Introduce new syntax that let's you
 project just the columns that come from a given :: prefix
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     [ https://issues.apache.org/jira/browse/PIG-3083?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Arnab Guin updated PIG-3083:
----------------------------

                 Tags: PIG-3078
               Labels: PIG-3078  (was: )
    Affects Version/s: 0.12
         Release Note: Support scope-wise references to load aliases within nested relations
               Status: Patch Available  (was: Open)
    
> Introduce new syntax that let's you project just the columns that come from a given :: prefix
> ---------------------------------------------------------------------------------------------
>
>                 Key: PIG-3083
>                 URL: https://issues.apache.org/jira/browse/PIG-3083
>             Project: Pig
>          Issue Type: Bug
>    Affects Versions: 0.12
>            Reporter: Jonathan Coveney
>              Labels: PIG-3078
>             Fix For: 0.12
>
>         Attachments: pig_jira_aguin_3083.patch
>
>
> This is basically a more refined approach than PIG-3078, but it is also more work. That JIRA is more of a stopgap until we do something like this.
> The idea would be to support something like the following:
> a = load 'a' as (x,y,z);
> b = load 'b'  as (x,y,z);
> c = join a by x, b by x;
> d = foreach c generate a::*;
> Obviously this is useful for any case where you have relations with columns with various prefixes.

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