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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