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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] Commented: (PIG-927) null should be handled consistently in Join
Date Thu, 15 Oct 2009 19:37:31 GMT

    [ https://issues.apache.org/jira/browse/PIG-927?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12766197#action_12766197
] 

Hadoop QA commented on PIG-927:
-------------------------------

-1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12422249/PIG-927-1.patch
  against trunk revision 825393.

    +1 @author.  The patch does not contain any @author tags.

    +1 tests included.  The patch appears to include 3 new or modified tests.

    +1 javadoc.  The javadoc tool did not generate any warning messages.

    +1 javac.  The applied patch does not increase the total number of javac compiler warnings.

    +1 findbugs.  The patch does not introduce any new Findbugs warnings.

    +1 release audit.  The applied patch does not increase the total number of release audit
warnings.

    -1 core tests.  The patch failed core unit tests.

    +1 contrib tests.  The patch passed contrib unit tests.

Test results: http://hudson.zones.apache.org/hudson/job/Pig-Patch-h7.grid.sp2.yahoo.net/82/testReport/
Findbugs warnings: http://hudson.zones.apache.org/hudson/job/Pig-Patch-h7.grid.sp2.yahoo.net/82/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Console output: http://hudson.zones.apache.org/hudson/job/Pig-Patch-h7.grid.sp2.yahoo.net/82/console

This message is automatically generated.

> 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: 0.4.0
>            Reporter: Pradeep Kamath
>            Assignee: Daniel Dai
>             Fix For: 0.6.0
>
>         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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