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From "Ashutosh Chauhan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-2780) Implement more restrictive table sampler
Date Sun, 13 Jan 2013 00:40:12 GMT

    [ https://issues.apache.org/jira/browse/HIVE-2780?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13552106#comment-13552106
] 

Ashutosh Chauhan commented on HIVE-2780:
----------------------------------------

I believe this new head sampler can only be used for FileInputFormat and only when its uncompressed.
Correct? I think since thats a pretty common setup, its useful even in its restricted form.
I applied the patch, but there were conflicts, I manually resolved the conflicts. Running
tests now. 
                
> Implement more restrictive table sampler
> ----------------------------------------
>
>                 Key: HIVE-2780
>                 URL: https://issues.apache.org/jira/browse/HIVE-2780
>             Project: Hive
>          Issue Type: Improvement
>            Reporter: Navis
>            Assignee: Navis
>            Priority: Trivial
>         Attachments: ASF.LICENSE.NOT.GRANTED--HIVE-2780.D1623.1.patch, ASF.LICENSE.NOT.GRANTED--HIVE-2780.D1623.2.patch
>
>
> Current table sampling scans whole block, making more rows included than expected especially
for small tables.

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