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Posted to dev@orc.apache.org by "Owen O'Malley (JIRA)" <ji...@apache.org> on 2018/01/19 18:56:00 UTC

[jira] [Created] (ORC-292) Build optional indexes on columns

Owen O'Malley created ORC-292:
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             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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