[jira] [Updated] (PIG-2119) DuplicateForEachColumnRewrite makes assumptions about the position of LOGGenerate in the plan

["Thejas M Nair (Updated) (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/PIG-2119?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Thejas M Nair updated PIG-2119:
-------------------------------

    Affects Version/s: 0.9.1
                       0.9.0

+1
                
> DuplicateForEachColumnRewrite makes assumptions about the position of LOGGenerate in the plan
> ---------------------------------------------------------------------------------------------
>
>                 Key: PIG-2119
>                 URL: https://issues.apache.org/jira/browse/PIG-2119
>             Project: Pig
>          Issue Type: Bug
>    Affects Versions: 0.9.0, 0.9.1
>            Reporter: Gianmarco De Francisci Morales
>            Assignee: Daniel Dai
>             Fix For: 0.10
>
>         Attachments: PIG-2119-1.patch
>
>
> The input:
> {code}
> grunt> cat b.txt
> a       11
> b       3
> c       10
> a       12
> b       10
> c       15
> {code}
> The script:
> {code}
> a = load 'b.txt' AS (id:chararray, num:int);
> b = group a by id;
> c = foreach b { 
>   d = order a by num DESC;
>   n = COUNT(a);
>   e = limit d 1;
>   generate n;
> }
> {code}
> The exception:
> {code}
> Caused by: java.lang.ClassCastException: org.apache.pig.newplan.logical.relational.LOLimit cannot be cast to org.apache.pig.newplan.logical.relational.LOGenerate
>         at org.apache.pig.newplan.logical.rules.DuplicateForEachColumnRewrite$DuplicateForEachColumnRewriteTransformer.check(DuplicateForEachColumnRewrite.java:87)
>         at org.apache.pig.newplan.optimizer.PlanOptimizer.optimize(PlanOptimizer.java:108)
> {code}
> I know the script is a bit pointless, but I was just testing and modifying the script bit by bit.
> If I remove the limit in any case I get the same exception but with LOSort.
> The problem, I think, is that the rule assumes there is only 1 sink in the nested block and that this sink is a LOGenerate.

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