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https://issues.apache.org/jira/browse/PIG-1554?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12925221#action_12925221
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Olga Natkovich commented on PIG-1554:
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most of the time for COUNT, the algebraic interface will be used. I am actually
not sure how often accumulator interface is used at this point so not sure how
many queries would be improved by this change
> PERF: create accumulative bag in RelationToExpressionProject
> ------------------------------------------------------------
>
> Key: PIG-1554
> URL: https://issues.apache.org/jira/browse/PIG-1554
> Project: Pig
> Issue Type: Improvement
> Reporter: Thejas M Nair
> Assignee: Thejas M Nair
> Fix For: 0.9.0
>
>
> In nested-foreach, RelationToExpressionProject creates a DefaultDataBag out
> of the results of PODistinct and POSort . If the results of the plan are
> going to be consumed by a operations that support accumulative interface such
> as COUNT the results can be linked to a new Accumulative bag .
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