hadoop-pig-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Daniel Dai (JIRA)" <j...@apache.org>
Subject [jira] Commented: (PIG-1289) PIG Join fails while doing a filter on joined data
Date Wed, 17 Mar 2010 01:07:27 GMT

    [ https://issues.apache.org/jira/browse/PIG-1289?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12846246#action_12846246
] 

Daniel Dai commented on PIG-1289:
---------------------------------

Oh, you are right. I need to further change the join type to regular join to make my idea
work. Since changing the join type may broke some other part of the code, so let's be safe
here and only push filter in front of a branch not generating null.

> 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
>            Assignee: Daniel Dai
>            Priority: Minor
>             Fix For: 0.7.0
>
>         Attachments: PIG-1289-1.patch
>
>
> 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,)

-- 
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.


Mime
View raw message