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Posted to jira@arrow.apache.org by "Will Jones (Jira)" <ji...@apache.org> on 2022/10/03 21:49:00 UTC

[jira] [Created] (ARROW-17923) [C++] Consider dictionary arrays for special fragment fields

Will Jones created ARROW-17923:
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             Summary: [C++] Consider dictionary arrays for special fragment fields
                 Key: ARROW-17923
                 URL: https://issues.apache.org/jira/browse/ARROW-17923
             Project: Apache Arrow
          Issue Type: Improvement
          Components: C++
            Reporter: Will Jones


I noticed in ARROW-15281 we made {{__filename}} a string column. In common cases, this will be inefficient if materialized. If possible, it may be better to have them be dictionary arrays.

As an example, [here|https://github.com/apache/arrow/pull/12826#issuecomment-1230745059] is a user report of 10x increased memory usage caused by accidentally including these special fragment columns.



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