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https://issues.apache.org/jira/browse/PIG-2119?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13186010#comment-13186010
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Daniel Dai commented on PIG-2119:
---------------------------------
Patch committed to 0.9 branch as per Dmitriy's request (PIG-2474)
> 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: 0.9.2, 0.10, 0.11
>
> 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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