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From "Ning Zhang (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HIVE-741) NULL is not handled correctly in join
Date Sat, 08 Aug 2009 04:04:14 GMT

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

Ning Zhang updated HIVE-741:
----------------------------

    Description: 
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.


  was:
This command fails with the following error:
{code}
hive/bin/hive -e "INSERT OVERWRITE LOCAL DIRECTORY 'abc' select null from zshao_tt"
FAILED: Error in semantic analysis:
java.lang.RuntimeException: Internal error: Cannot find ObjectInspector for VOID
{code}

When 'null' is replaced by '' it works.



> 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: Ning Zhang
>
> 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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