[jira] [Created] (ARROW-7699) [Java] Support concating dense union vectors in batch

[Liya Fan (Jira)]

Liya Fan created ARROW-7699:
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             Summary: [Java] Support concating dense union vectors in batch
                 Key: ARROW-7699
                 URL: https://issues.apache.org/jira/browse/ARROW-7699
             Project: Apache Arrow
          Issue Type: New Feature
          Components: Java
            Reporter: Liya Fan
            Assignee: Liya Fan


After supporting the dense union vector, we need to support concating dense 
union vectors in batch. 



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