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https://issues.apache.org/jira/browse/HIVE-741?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12898132#action_12898132
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Ted Xu commented on HIVE-741:
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Thanks for Ning and Amareshwari, we are looking forward to see the bug fixed. I
think it's Okay to solve it by modifying the *JoinOperators, but it will be
great if we can filter the NULL values in mappers, say, in ReduceSinkOperator,
provided if we can know which part of the reduce sink key is from join (other
than from group by, distinct, etc,.).
> 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
>
> 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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