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From "Anja Gruenheid (JIRA)" <j...@apache.org>
Subject [jira] Created: (HIVE-1940) Query Optimization Using Column Metadata and Histograms
Date Wed, 02 Feb 2011 00:52:28 GMT
Query Optimization Using Column Metadata and Histograms
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                 Key: HIVE-1940
                 URL: https://issues.apache.org/jira/browse/HIVE-1940
             Project: Hive
          Issue Type: New Feature
          Components: Metastore, Query Processor
            Reporter: Anja Gruenheid


The current basis for cost-based query optimization in Hive is information gathered on tables
and partitions. To make further improvements in query optimization possible, the next step
is to develop and implement possibilities to gather information on columns as discussed in
issue HIVE-33. After that, an implementation of histograms is a possible option to use and
collect run-time statistics. Next to the actual implementation of these features, it is also
necessary to develop a consistent storage model for the MetaStore.

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