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https://issues.apache.org/jira/browse/PIG-963?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12756166#action_12756166
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Daniel Dai commented on PIG-963:
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+1

> Join in local mode matches null keys
> ------------------------------------
>
>                 Key: PIG-963
>                 URL: https://issues.apache.org/jira/browse/PIG-963
>             Project: Pig
>          Issue Type: Bug
>    Affects Versions: 0.4.0
>            Reporter: Pradeep Kamath
>            Assignee: Pradeep Kamath
>         Attachments: PIG-963-2.patch, PIG-963.patch
>
>
> Semantics of join and cogroup dictate that null values for the keys from 
> different inputs are NOT supposed to match. This is true in map reduce mode 
> but local mode incorrectly matches these records.

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