[jira] [Created] (ARROW-13653) [C++][Dataset] Remove UnionDataset in favor of UnionExecNode

[David Li (Jira)]

David Li created ARROW-13653:
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             Summary: [C++][Dataset] Remove UnionDataset in favor of 
UnionExecNode
                 Key: ARROW-13653
                 URL: https://issues.apache.org/jira/browse/ARROW-13653
             Project: Apache Arrow
          Issue Type: Improvement
          Components: C++
            Reporter: David Li


As a follow-up to ARROW-11981, we should actually remove UnionDataset.



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