Ji Liu created ARROW-6289:
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Summary: [Java] Add empty() in UnionVector to create instance
Key: ARROW-6289
URL: https://issues.apache.org/jira/browse/ARROW-6289
Project: Apache Arrow
Issue Type: Improvement
Components: Java
Reporter: Ji Liu
Assignee: Ji Liu
Currently complex type vectors all have {{empty}}() API to create instance
except {{UnionVector}}.
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