[jira] Assigned: (PIG-927) null should be handled consistently in Join

["Daniel Dai (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/PIG-927?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Daniel Dai reassigned PIG-927:
------------------------------

    Assignee: Daniel Dai

> null should be handled consistently in Join
> -------------------------------------------
>
>                 Key: PIG-927
>                 URL: https://issues.apache.org/jira/browse/PIG-927
>             Project: Pig
>          Issue Type: Bug
>    Affects Versions: 0.3.0
>            Reporter: Pradeep Kamath
>            Assignee: Daniel Dai
>         Attachments: PIG-927-1.patch
>
>
> Currenlty Pig mostly follows SQL semantics for handling null. However there are certain cases where pig may need to handle nulls correctly. One example is the join - joins on single keys results in null keys not matching to produce an output. However if the join is on >1 keys, in the key tuple, if one of the values is null, it still matches with another key tuple which has a null for that value. We need to decide the right semantics here. 

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