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From "Julien Le Dem (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (PIG-2659) add source location of the aliases in the physical plan
Date Sat, 12 May 2012 15:00:49 GMT

     [ https://issues.apache.org/jira/browse/PIG-2659?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Julien Le Dem resolved PIG-2659.
--------------------------------

       Resolution: Fixed
    Fix Version/s: 0.11
    
> add source location of the aliases in the physical plan
> -------------------------------------------------------
>
>                 Key: PIG-2659
>                 URL: https://issues.apache.org/jira/browse/PIG-2659
>             Project: Pig
>          Issue Type: Improvement
>          Components: impl
>            Reporter: Julien Le Dem
>            Assignee: Julien Le Dem
>             Fix For: 0.11
>
>         Attachments: PIG-2659.patch, PIG-2659_a.patch, PIG-2659_b.patch, PIG-2659_c.patch,
PIG-2659_d.patch
>
>
> The goal is to provide better information about what is actually running in a job.
> In particular when alias names are being reused.
> For example with the following script:
> {code}
> A = LOAD 'foo' using PigStorage();
> B = GROUP A BY $0;
> A = FOREACH B GENERATE COUNT(A);
> STORE A INTO 'bar';
> {code}
> The job conf will contain the following information
> {code}
> pig.alias.location: M: A[1,4],A[3,4],B[2,4] C: A[3,4],B[2,4] R: A[3,4]
> {code}
> A caveat is that the Logical Plan Optimizer throws away the original information when
merging Logical Operators.
> this is already the case today with pig.alias 

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