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https://issues.apache.org/jira/browse/PIG-4587?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15105548#comment-15105548
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Rohini Palaniswamy commented on PIG-4587:
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Found that PIG-4377 fix for right outer join produces wrong results with left
outer join and skips records if it is not the first reducer which is very bad.
> Only apply isFirstReduceOfKey for Skewed right outer join
> ---------------------------------------------------------
>
> Key: PIG-4587
> URL: https://issues.apache.org/jira/browse/PIG-4587
> Project: Pig
> Issue Type: Bug
> Reporter: Rohini Palaniswamy
> Assignee: Daniel Dai
> Fix For: 0.16.0
>
>
> PIG-4377 introduced isFirstReduceOfKey to avoid extra records in case of over
> sampling. But the issue can occur only in the case of right outer join. But
> it is added to the plan in MRCompiler and TezCompiler (PIG-4580) for both
> left and right outer joins. We need to remove that extra check for right
> outer join. It is unnecessary performance penalty.
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