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https://issues.apache.org/jira/browse/ARROW-10437?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ben Kietzman reassigned ARROW-10437:
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Assignee: (was: Ben Kietzman)
> [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
> Priority: Major
> Labels: dataset
> Fix For: 6.0.0
>
>
> 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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