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From "Amareshwari Sriramadasu (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HIVE-741) NULL is not handled correctly in join
Date Tue, 24 Aug 2010 06:38:17 GMT

     [ https://issues.apache.org/jira/browse/HIVE-741?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Amareshwari Sriramadasu updated HIVE-741:
-----------------------------------------

    Attachment: patch-741-6.txt

Patch with following changes:
* Renamed the method hasNullElements to hasAllNulls
* Added keyToHasNullsMap to SMBMapJoinOperator to cache whether key has nulls or not, which
is populated when the key elements are computed.
* Added appropriate "order by" clauses to smb join queries in the testcase

> 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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