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Posted to jira@arrow.apache.org by "Ben Kietzman (Jira)" <ji...@apache.org> on 2021/02/23 20:13:00 UTC

[jira] [Created] (ARROW-11749) [C++][Dataset] Support projections between children of UnionDatasets

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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