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From "bharath v (JIRA)" <j...@apache.org>
Subject [jira] Created: (HIVE-1938) Cost Based Query optimization in Hive
Date Tue, 01 Feb 2011 06:52:29 GMT
Cost Based Query optimization in Hive
-------------------------------------

                 Key: HIVE-1938
                 URL: https://issues.apache.org/jira/browse/HIVE-1938
             Project: Hive
          Issue Type: Improvement
          Components: Query Processor
         Environment: *nix,java
            Reporter: bharath v


Current optimization in Hive is just rule-based and involves applying a set of rules on the
Plan tree. This depends on hints given by the user (which may or may-not be correct) and might
result in execution of costlier plans.So this jira aims at building a cost-model which can
give a good estimate various plans before hand (using some meta-data already collected) and
we can choose the best plan which incurs the least cost.

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