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From "Namit Jain (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HIVE-308) UNION ALL should create different destination directories for different operands
Date Sun, 08 Mar 2009 16:23:56 GMT

    [ https://issues.apache.org/jira/browse/HIVE-308?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12679992#action_12679992
] 

Namit Jain commented on HIVE-308:
---------------------------------

I saw your other mail just now - if you are in a hurry, go ahead.
The changes look good


+1


> UNION ALL should create different destination directories for different operands
> --------------------------------------------------------------------------------
>
>                 Key: HIVE-308
>                 URL: https://issues.apache.org/jira/browse/HIVE-308
>             Project: Hadoop Hive
>          Issue Type: Bug
>          Components: Query Processor
>    Affects Versions: 0.3.0
>            Reporter: Zheng Shao
>            Priority: Blocker
>         Attachments: HIVE-308.1.patch
>
>
> The following query hangs:
> {code} 
> select * from (select 1 from zshao_lazy union all select 2 from zshao_lazy) a;
> {code} 
> The following query produce wrong results: (one map-reduce job overwrite/cannot overwrite
the result of the other)
> {code} 
> select * from (select 1 as id from zshao_lazy cluster by id union all select 2 as id
from zshao_meta) a;
> {code} 
> The reason of both is that the destination directory of the file sink operator conflicts
with each other.

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