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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