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From "Pradeep Kamath (JIRA)" <j...@apache.org>
Subject [jira] Created: (PIG-927) null should be handled consistently in Join
Date Tue, 18 Aug 2009 20:34:14 GMT
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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