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From "Richard Ding (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (PIG-1999) Macro alias masker should consider schema context
Date Thu, 05 May 2011 17:07:03 GMT

     [ https://issues.apache.org/jira/browse/PIG-1999?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Richard Ding resolved PIG-1999.
-------------------------------

      Resolution: Fixed
    Hadoop Flags: [Reviewed]

Unit tests pass. Patch committed to trunk and 0.9 branch.

> Macro alias masker should consider schema context 
> --------------------------------------------------
>
>                 Key: PIG-1999
>                 URL: https://issues.apache.org/jira/browse/PIG-1999
>             Project: Pig
>          Issue Type: Bug
>          Components: impl
>    Affects Versions: 0.9.0
>            Reporter: Richard Ding
>            Assignee: Richard Ding
>             Fix For: 0.9.0
>
>         Attachments: PIG-1999_1.patch, PIG-1999_2.patch
>
>
> Macro alias masker doesn't consider the current schema context. This results errors when
deciding with alias to mask. Here is an example:
> {code}
> define toBytearray(in, intermediate) returns e { 
>    a = load '$in' as (name:chararray, age:long, gpa: float);
>    b = group a by  name;
>    c = foreach b generate a, (1,2,3);
>    store c into '$intermediate' using BinStorage();
>    d = load '$intermediate' using BinStorage() as (b:bag{t:tuple(x,y,z)}, t2:tuple(a,b,c));
>    $e = foreach d generate COUNT(b), t2.a, t2.b, t2.c;
> };
>  
> f = toBytearray ('data', 'output1');
> {code} 
> Now the alias masker mistakes b in COUNT(b) as an alias instead of b in the current schema.
> The workaround is to not use alias as as names in the schema definition. 

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