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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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