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From "Siying Dong (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-2451) TABLESAMBLE(BUCKET xxx) sometimes doesn't trigger input pruning as regression of HIVE-1538
Date Fri, 16 Sep 2011 17:34:08 GMT

     [ https://issues.apache.org/jira/browse/HIVE-2451?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

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

    Status: Open  (was: Patch Available)

There's a bug.

> 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
>
>
> 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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