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From "Yongzhi Chen (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-11319) CTAS with location qualifier overwrites directories
Date Mon, 03 Aug 2015 02:11:04 GMT

     [ https://issues.apache.org/jira/browse/HIVE-11319?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Yongzhi Chen updated HIVE-11319:
--------------------------------
    Attachment: HIVE-11319.2.patch

> 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
>         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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