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Date: Tue, 24 Aug 2010 14:29:17 -0400 (EDT)
From: "Ning Zhang (JIRA)" <jira@apache.org>
To: hive-dev@hadoop.apache.org
Subject: [jira] Commented: (HIVE-741) NULL is not handled correctly in join
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    [ https://issues.apache.org/jira/browse/HIVE-741?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12902004#action_12902004 ] 

Ning Zhang commented on HIVE-741:
---------------------------------

+1. Will commit if tests pass.

> NULL is not handled correctly in join
> -------------------------------------
>
>                 Key: HIVE-741
>                 URL: https://issues.apache.org/jira/browse/HIVE-741
>             Project: Hadoop Hive
>          Issue Type: Bug
>            Reporter: Ning Zhang
>            Assignee: Amareshwari Sriramadasu
>         Attachments: join_nulls.q.out, patch-741-1.txt, patch-741-2.txt, patch-741-3.txt, patch-741-4.txt, patch-741-5.txt, patch-741-6.txt, patch-741.txt, smbjoin_nulls.q.txt
>
>
> With the following data in table input4_cb:
> Key        Value
> ------       --------
> NULL     325
> 18          NULL
> The following query:
> {code}
> select * from input4_cb a join input4_cb b on a.key = b.value;
> {code}
> returns the following result:
> NULL    325    18   NULL
> The correct result should be empty set.
> When 'null' is replaced by '' it works.

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