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https://issues.apache.org/jira/browse/PIG-927?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12753249#action_12753249
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Alan Gates commented on PIG-927:
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It seems that the right semantic would be to follow SQL consistently, as that
is what we say we do.
> 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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