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https://issues.apache.org/jira/browse/PIG-5224?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15974882#comment-15974882
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Koji Noguchi commented on PIG-5224:
-----------------------------------

[~daijy], probably a silly question.  
In what situation do we still want to insert LOForEach for columnpruning when 
next operation is also a LOForEach? 

> Extra foreach from ColumnPrune preventing Accumulator usage
> -----------------------------------------------------------
>
>                 Key: PIG-5224
>                 URL: https://issues.apache.org/jira/browse/PIG-5224
>             Project: Pig
>          Issue Type: Improvement
>            Reporter: Koji Noguchi
>            Assignee: Koji Noguchi
>         Attachments: pig-5224-v0-testonly.patch, pig-5224-v1.patch
>
>
> {code}
> A = load 'input' as (id:int, fruit);
> B = foreach A generate id; -- to enable columnprune
> C = group B by id;
> D = foreach C {
>     o = order B by id;
>     generate org.apache.pig.test.utils.AccumulatorBagCount(o);
> }
> STORE D into ...
> {code}
> Pig fails to use Accumulator interface for this UDF.



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