[jira] Updated: (PIG-429) Self join wth implicit split has the join output in wrong order

["Pradeep Kamath (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/PIG-429?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Pradeep Kamath updated PIG-429:
-------------------------------

    Attachment: PIG-429.patch

patch for issue - passes all unit tests

> Self join wth implicit split has the join output in wrong order
> ---------------------------------------------------------------
>
>                 Key: PIG-429
>                 URL: https://issues.apache.org/jira/browse/PIG-429
>             Project: Pig
>          Issue Type: Bug
>    Affects Versions: types_branch
>            Reporter: Pradeep Kamath
>             Fix For: types_branch
>
>         Attachments: PIG-429.patch
>
>
> Query:
> {code}
> A = load 'st10k' split by 'file';
> B = filter A by $1 > 25;
> D = join A by $0, B by $0;
> dump D;
> {code}
> In the output the columns from B are projected out first and from A next. On closer examination of the code, the ImplicitSplitInserter class adds in the split and two splitoutput operators into the plan and tries the connect the successors of LOad to these. However it does this by iterating over its successors and disconnecting from them and connecting up the split-splitoutput to the successors. However the order in which it gets its successors is NOT the same as the order in which cogroup (join) expects its inputs. Hence the discrepancy. 

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