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From "Olga Natkovich (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (PIG-1529) Equating aliases does not work (B = A)
Date Mon, 02 Aug 2010 19:09:16 GMT

     [ https://issues.apache.org/jira/browse/PIG-1529?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Olga Natkovich resolved PIG-1529.
---------------------------------

    Resolution: Duplicate

This is duplicate of https://issues.apache.org/jira/browse/PIG-438

> Equating aliases does not work (B = A)
> --------------------------------------
>
>                 Key: PIG-1529
>                 URL: https://issues.apache.org/jira/browse/PIG-1529
>             Project: Pig
>          Issue Type: Improvement
>    Affects Versions: 0.7.0
>            Reporter: Viraj Bhat
>
> I wanted to do a self-join
> {code}
> 1       one
> 1       uno
> 2       two
> 2       dos
> 3       three
> 3       tres
> {code}
> viraj@machine~/pigscripts >pig -x local script.pig
> script.pig
> -- since the below does not work
> {code}
> A = load 'Adataset.txt' as (key:int, value:chararray);
> C = join A by key, A by key;
> dump C;
> {code} 
> -- i tried the below it fails with:
> {code}
> A = load 'Adataset.txt' as (key:int, value:chararray);
> B = A;
> C = join A by key, B by key;
> dump C;
> {code}
> 2010-07-30 23:19:32,789 [main] ERROR org.apache.pig.tools.grunt.Grunt - ERROR 1000: Error
during parsing. Currently PIG does not support assigning an existing relation (B) to another
alias (A)
> Details at logfile: /homes/viraj/pigscripts/pig_1280531249235.log
> There is a workaround currently:
> {code}
> A = load 'Adataset.txt' as (key:int, value:chararray);
> B = foreach A generate *;
> C = join A by key, B by key;
> dump C;
> {code}
> Viraj

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