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Date: Wed, 24 Aug 2011 18:46:29 +0000 (UTC)
From: "Siying Dong (JIRA)" <jira@apache.org>
To: hive-dev@hadoop.apache.org
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Subject: [jira] [Commented] (HIVE-2352) create empty files if and only if
 table is bucketed and hive.enforce.bucketing=true
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    [ https://issues.apache.org/jira/browse/HIVE-2352?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13090399#comment-13090399 ] 

Siying Dong commented on HIVE-2352:
-----------------------------------

I ran tests twice. Both crashed. I think it is an important patch and will improve latency of some queries (like scanning a large dataset for one or two rows) dramatically (Currently I sometimes do a "ORDER BY LIMIT BY" to speed it up if I know the data set is small). We should raise the priority.

> create empty files if and only if table is bucketed and hive.enforce.bucketing=true
> -----------------------------------------------------------------------------------
>
>                 Key: HIVE-2352
>                 URL: https://issues.apache.org/jira/browse/HIVE-2352
>             Project: Hive
>          Issue Type: Bug
>            Reporter: Franklin Hu
>            Assignee: Franklin Hu
>            Priority: Minor
>             Fix For: 0.8.0
>
>         Attachments: hive-2352.1.patch, hive-2352.2.patch, hive-2352.3.patch
>
>
> create table t1 (key int, value string) stored as rcfile;
> insert overwrite table t1 select * from src where false;
> Creates an empty RCFile with no rows and size 151B. The file not should be created since there are no rows.

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