You are viewing a plain text version of this content. The canonical link for it is here.
Posted to dev@hive.apache.org by "Amareshwari Sriramadasu (JIRA)" <ji...@apache.org> on 2010/08/16 13:45:17 UTC
[jira] Updated: (HIVE-741) NULL is not handled correctly in join
[ 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.txt
Attaching a simple patch which fixes JoinOperator (for reduce-side joins) and MapJoinOperator (for map-side joins) to not group the null join keys together.
Any comments on the approach/code are welcome.
Verified that SMBMapJoinOperator already filters nulls properly.
> 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: patch-741.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.
--
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.