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From "Owen O'Malley (JIRA)" <j...@apache.org>
Subject [jira] [Created] (ORC-292) Build optional indexes on columns
Date Fri, 19 Jan 2018 18:56:00 GMT
Owen O'Malley created ORC-292:
---------------------------------

             Summary: Build optional indexes on columns
                 Key: ORC-292
                 URL: https://issues.apache.org/jira/browse/ORC-292
             Project: ORC
          Issue Type: Improvement
            Reporter: Owen O'Malley


For small cardinality string columns, including nested columns, it would be really nice to
have an optional index at the stripe level that records for each value, which row groups that
value occurs in.

I would propose making a new index that maps from the dictionary position to row group number.



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