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From "Pradeep Kamath (JIRA)" <j...@apache.org>
Subject [jira] Commented: (PIG-927) null should be handled consistently in Join
Date Wed, 16 Sep 2009 18:51:57 GMT

    [ https://issues.apache.org/jira/browse/PIG-927?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12756170#action_12756170
] 

Pradeep Kamath commented on PIG-927:
------------------------------------

I meant "This is a issue in both map reduce and local mode"

> 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
>
> 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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