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From "Siying Dong (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HIVE-2451) TABLESAMBLE(BUCKET xxx) sometimes doesn't trigger input pruning as regression of HIVE-1538
Date Thu, 15 Sep 2011 23:50:09 GMT
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


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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