Ben Kietzman created ARROW-11749:
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Summary: [C++][Dataset] Support projections between children of
UnionDatasets
Key: ARROW-11749
URL: https://issues.apache.org/jira/browse/ARROW-11749
Project: Apache Arrow
Issue Type: Improvement
Components: C++
Affects Versions: 3.0.0
Reporter: Ben Kietzman
Assignee: Ben Kietzman
Fix For: 4.0.0
ARROW-11174 adds support for arbitrary expressions in projection. It'd be
useful to have that power when unifying disparate child datasets. For example,
even the simple case where a column is renamed in a newer data file currently
cannot be accommodated.
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