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Posted to jira@arrow.apache.org by "Ben Kietzman (Jira)" <ji...@apache.org> on 2020/10/30 20:27:00 UTC

[jira] [Created] (ARROW-10437) [C++][Dataset] Ensure virtual columns are not materialized on write

Ben Kietzman created ARROW-10437:
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             Summary: [C++][Dataset] Ensure virtual columns are not materialized on write
                 Key: ARROW-10437
                 URL: https://issues.apache.org/jira/browse/ARROW-10437
             Project: Apache Arrow
          Issue Type: Improvement
          Components: C++
    Affects Versions: 2.0.0
            Reporter: Ben Kietzman
            Assignee: Ben Kietzman
             Fix For: 3.0.0


If a column is virtual on read and will remain virtual after writing then materializing and grouping on it is a pure waste. Maybe Partitioning::Partition should take a "already known" partition expression and only group on columns not in it?



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