[jira] [Created] (ARROW-14615) [C++] Support nested field refs into unions

[David Li (Jira)]

David Li created ARROW-14615:
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             Summary: [C++] Support nested field refs into unions
                 Key: ARROW-14615
                 URL: https://issues.apache.org/jira/browse/ARROW-14615
             Project: Apache Arrow
          Issue Type: Improvement
          Components: C++
            Reporter: David Li
            Assignee: David Li


Also move the implementation into a kernel so it can be more easily used. 
Follow-up to ARROW-13987.



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