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