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https://issues.apache.org/jira/browse/HIVE-741?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12899177#action_12899177
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Namit Jain commented on HIVE-741:
---------------------------------
For inner, left and right outer joins, a simpler fix would be to add a filter
on top.
For example, for
A join B on A.c1 = B.c2
add a filter before A (A.c1 is not null) and B (B.c2 is not null)
For
A left outer join B on A.c1 = B.c2, the filter before A is not needed and
similarly, for
A right outer join B on A.c1 = B.c2, the filter before B is not needed
Some special handling might still be needed for full outer joins and sort-merge
joins
> 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.
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