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Posted to dev@hive.apache.org by "Owen O'Malley (JIRA)" <ji...@apache.org> on 2013/03/28 16:39:15 UTC

[jira] [Created] (HIVE-4244) Make string dictionaries adaptive in ORC

Owen O'Malley created HIVE-4244:
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             Summary: Make string dictionaries adaptive in ORC
                 Key: HIVE-4244
                 URL: https://issues.apache.org/jira/browse/HIVE-4244
             Project: Hive
          Issue Type: Bug
          Components: Serializers/Deserializers
            Reporter: Owen O'Malley
            Assignee: Owen O'Malley


The ORC writer should adaptively switch between dictionary and direct encoding. I'd propose looking at the first 100,000 values in each column and decide whether there is sufficient loading in the dictionary to use dictionary encoding.

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