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From "Karim Saadah (JIRA)" <j...@apache.org>
Subject [jira] Created: (PIG-1289) PIG Join fails while doing a filter on joined data
Date Wed, 10 Mar 2010 16:37:27 GMT
PIG Join fails while doing a filter on joined data
--------------------------------------------------

                 Key: PIG-1289
                 URL: https://issues.apache.org/jira/browse/PIG-1289
             Project: Pig
          Issue Type: Bug
    Affects Versions: 0.6.0
            Reporter: Karim Saadah
            Priority: Minor


PIG Join fails while doing a filter on joined data

Here are the steps to reproduce it:
-bash-3.1$ pig -latest -x local
grunt> a = load 'first.dat' using PigStorage('\u0001') as (f1:int, f2:chararray);
grunt> DUMP a;
(1,A)
(2,B)
(3,C)
(4,D)

grunt> b = load 'second.dat' using PigStorage() as (f3:chararray);
grunt> DUMP b;
(A)
(D)
(E)

grunt> c = join a by f2 LEFT OUTER, b by f3;
grunt> DUMP c;
(1,A,A)
(2,B,)
(3,C,)
(4,D,D)
grunt> describe c;
c: {a::f1: int,a::f2: chararray,b::f3: chararray}
grunt> d = filter c by (f3 is null or f3 =='');

grunt> dump d;
2010-03-03 15:00:37,129 [main] INFO  org.apache.pig.impl.logicalLayer.optimizer.PruneColumns
- No column pruned for b
2010-03-03 15:00:37,129 [main] INFO  org.apache.pig.impl.logicalLayer.optimizer.PruneColumns
- No map keys pruned for b
2010-03-03 15:00:37,129 [main] INFO  org.apache.pig.impl.logicalLayer.optimizer.PruneColumns
- No column pruned for a
2010-03-03 15:00:37,130 [main] INFO  org.apache.pig.impl.logicalLayer.optimizer.PruneColumns
- No map keys pruned for a
2010-03-03 15:00:37,130 [main] ERROR org.apache.pig.tools.grunt.Grunt - ERROR 1002: Unable
to store alias d


This one is failing too:

grunt> d = filter c by (b::f3 is null or b::f3 =='');

or this one not returning results as expected:

grunt> d = foreach c generate f1 as f1, f2 as f2, f3 as f3;
grunt> e = filter d by (f3 is null or f3 =='');
grunt> DUMP e;
(1,A,)
(2,B,)
(3,C,)
(4,D,)

while the expected result is
(2,B,)
(3,C,)



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