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