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https://issues.apache.org/jira/browse/PIG-4001?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14036254#comment-14036254
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Cheolsoo Park commented on PIG-4001:
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+1. Will commit this later today.
> POPartialAgg aggregates too aggressively when multiple values aggregated
> ------------------------------------------------------------------------
>
> Key: PIG-4001
> URL: https://issues.apache.org/jira/browse/PIG-4001
> Project: Pig
> Issue Type: Bug
> Affects Versions: 0.13.0
> Reporter: Travis Woodruff
> Assignee: Travis Woodruff
> Priority: Minor
> Attachments: PIG-4001.patch
>
>
> {{POPartialAgg.aggregateRawRow()}} is counting values in
> {{numEntriesInTarget}}, but all the values that {{numEntriesInTarget}} is
> compared to count tuples.
> This is similar to PIG-3649 but has less of a performance impact, as it
> generally does not cause map-side aggregation to be disabled entirely (since
> {{aggregateRawRow()}} is unlikely to be called before
> {{checkSizeReduction()}}; however, it can cause second-level aggregation to
> be run too often.
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