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Date: Fri, 7 Aug 2009 20:58:14 -0700 (PDT)
From: "Ning Zhang (JIRA)" <jira@apache.org>
To: hive-dev@hadoop.apache.org
Subject: [jira] Commented: (HIVE-734) problem in dealing with null
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    [ https://issues.apache.org/jira/browse/HIVE-734?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12740834#action_12740834 ] 

Ning Zhang commented on HIVE-734:
---------------------------------

In the failing query, there is no column corresponding to null (select null from tt), so the semantic analyzer doesn't know the type of the NULL, therefore it is VOID type. That's why JavaVoidObjectInspector needs to be created. It is the similar that in (select 2 from tt), An JavaIntegerObjectInspector is needed for the constant 2. 

> problem in dealing with null
> ----------------------------
>
>                 Key: HIVE-734
>                 URL: https://issues.apache.org/jira/browse/HIVE-734
>             Project: Hadoop Hive
>          Issue Type: Bug
>            Reporter: Zheng Shao
>            Assignee: Ning Zhang
>
> 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.

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