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https://issues.apache.org/jira/browse/PIG-651?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12757297#action_12757297
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Alan Gates commented on PIG-651:
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Is it worth adding this complexity to the code for a 2% speed up?  I'd vote no.

> PERFORMANCE: Use specialized POForEachNoFlatten for cases where the foreach 
> has no flattens
> -------------------------------------------------------------------------------------------
>
>                 Key: PIG-651
>                 URL: https://issues.apache.org/jira/browse/PIG-651
>             Project: Pig
>          Issue Type: Improvement
>    Affects Versions: 0.2.0
>            Reporter: Pradeep Kamath
>            Assignee: Pradeep Kamath
>         Attachments: PIG-651.patch
>
>
> POForEach has lot of code to handle flattening (cross product) of the fields 
> in the generate. This is relevant only when atleast one field in the generate 
> needs to be flattened. If all fields in the generate do not need to be 
> flattened, a more simplified and hopefully more efficient POForEach can be 
> used.

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