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Date: Thu, 28 Jan 2010 00:16:34 +0000 (UTC)
From: "Namit Jain (JIRA)" <jira@apache.org>
To: hive-dev@hadoop.apache.org
Subject: [jira] Created: (HIVE-1115) optimize combinehiveinputformat in
 presence of many partitions
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optimize combinehiveinputformat in presence of many partitions
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                 Key: HIVE-1115
                 URL: https://issues.apache.org/jira/browse/HIVE-1115
             Project: Hadoop Hive
          Issue Type: Improvement
          Components: Query Processor
            Reporter: Namit Jain


A query like :


select ..  from T where ...

where T contains a very large number of partitions does not work very well with CombineHiveInputFomat.

A pool is created per directory, which leads to a high number of mappers.
In case all partitions share the same operator tree, and the same partition description, only a single pool should be created.

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