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https://issues.apache.org/jira/browse/PIG-1584?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13016639#comment-13016639
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Olga Natkovich commented on PIG-1584:
-------------------------------------
It looks like we already do not mention inner or outer keywords neither in the
syntax of group/cogroup, nor in any discussions.
The only place I found the reference is in examples where I suggest to do the
following:
- remove all examples from GROUP section that refer to INNER cogroup
- There is also example in the description of IsEmpty function that uses inner
cogroup, it should be changed to an outer join as follows:
SSN = load 'ssn.txt' using PigStorage() as (ssn:long);
SSN_NAME = load 'students.txt' using PigStorage() as (ssn:long, name:chararray);
-- do a left out join of SSN with SSN_Name
X = JOIN SSN by ssn LEFT OUTER, SSN_NAME by ssn;
-- only keep those ssn's for which there is no name
Y = filter X by IsEmpty(SSN_NAME);
> deal with inner cogroup
> -----------------------
>
> Key: PIG-1584
> URL: https://issues.apache.org/jira/browse/PIG-1584
> Project: Pig
> Issue Type: Bug
> Reporter: Olga Natkovich
> Assignee: Corinne Chandel
> Fix For: 0.9.0
>
>
> The current implementation of inner in case of cogroup is in conflict with
> join. We need to decide of whether to fix inner cogroup or just remove the
> functionality if it is not widely used
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