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https://issues.apache.org/jira/browse/ARROW-11981?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17302515#comment-17302515
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Ben Kietzman commented on ARROW-11981:
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[~davidli] [~westonpace]
> [C++][Dataset][Compute] Replace UnionDataset with Union ExecNode
> ----------------------------------------------------------------
>
> Key: ARROW-11981
> URL: https://issues.apache.org/jira/browse/ARROW-11981
> Project: Apache Arrow
> Issue Type: Improvement
> Components: C++
> Affects Versions: 3.0.0
> Reporter: Ben Kietzman
> Priority: Major
> Labels: dataset
>
> UnionDataset allows Fragments of multiple schemas and differing file formats
> to be scanned together as a single Dataset. This is useful functionality but
> makes the Dataset interface somewhat difficult to reason about since it must
> be general enough to accommodate UnionDataset.
> After ARROW-11928 it will probably be more natural to support unioning of
> datasets through a subclass of ExecNode. Reconciliation of differing schemas
> can then be trivially handled by a full ProjectNode.
> Note this would obviate both ARROW-11001 and ARROW-11749. In addition,
> Dataset could be simplified to a concrete class containing a set of
> compatibly typed/formatted Fragments.
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