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From "Viraj Bhat (JIRA)" <j...@apache.org>
Subject [jira] Created: (PIG-1529) Equating aliases does not work (B = A)
Date Fri, 30 Jul 2010 23:29:16 GMT
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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