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Date: Fri, 16 Sep 2011 18:25:09 +0000 (UTC)
From: "Siying Dong (JIRA)" <jira@apache.org>
To: hive-dev@hadoop.apache.org
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Subject: [jira] [Updated] (HIVE-2451) TABLESAMBLE(BUCKET xxx) sometimes
 doesn't trigger input pruning as regression of HIVE-1538
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     [ https://issues.apache.org/jira/browse/HIVE-2451?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Siying Dong updated HIVE-2451:
------------------------------

    Attachment: HIVE-2451.2.patch

Changed an assert issue and recover the some test result files which were changed incorrectly by HIVE-1538.

> TABLESAMBLE(BUCKET xxx) sometimes doesn't trigger input pruning as regression of HIVE-1538
> ------------------------------------------------------------------------------------------
>
>                 Key: HIVE-2451
>                 URL: https://issues.apache.org/jira/browse/HIVE-2451
>             Project: Hive
>          Issue Type: Bug
>            Reporter: Siying Dong
>            Assignee: Siying Dong
>         Attachments: HIVE-2451.1.patch, HIVE-2451.2.patch
>
>
> Example:
> select count(1) from <bucket_table> TABLESAMPLE(BUCKET xxx out of yyy) where <partition_column> = 'xxx'
> will not trigger input pruning.
> The reason is that we assume sample filtering operator only happens as the second filter after table scan, which is broken by HIVE-1538, even if the feature doesn't turn on.

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