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Date: Tue, 4 Aug 2015 18:25:04 +0000 (UTC)
From: "Szehon Ho (JIRA)" <jira@apache.org>
To: issues@hive.apache.org
Message-ID: <JIRA.12846376.1437430604000.369614.1438712704932@Atlassian.JIRA>
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 <JIRA.12846376.1437430604758@arcas>
Subject: [jira] [Updated] (HIVE-11319) CTAS with location qualifier
 overwrites directories
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     [ https://issues.apache.org/jira/browse/HIVE-11319?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Szehon Ho updated HIVE-11319:
-----------------------------
    Labels: backward-incompatible  (was: )

> CTAS with location qualifier overwrites directories
> ---------------------------------------------------
>
>                 Key: HIVE-11319
>                 URL: https://issues.apache.org/jira/browse/HIVE-11319
>             Project: Hive
>          Issue Type: Bug
>          Components: Parser
>    Affects Versions: 0.14.0, 1.0.0, 1.2.0
>            Reporter: Yongzhi Chen
>            Assignee: Yongzhi Chen
>              Labels: backward-incompatible
>         Attachments: HIVE-11319.1.patch, HIVE-11319.2.patch
>
>
> CTAS with location clause acts as an insert overwrite. This can cause problems when there sub directories with in a directory.
> This cause some users accidentally wipe out directories with very important data. We should  ban CTAS with location to a non-empty directory. 
> Reproduce:
> create table ctas1  
> location '/Users/ychen/tmp' 
> as 
> select * from jsmall limit 10;
> create table ctas2  
> location '/Users/ychen/tmp' 
> as 
> select * from jsmall limit 5;
> Both creates will succeed. But value in table ctas1 will be replaced by ctas2 accidentally. 


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