Ji Liu created ARROW-6600:
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Summary: [Java] Implement dictionary-encoded subfields for Union
type
Key: ARROW-6600
URL: https://issues.apache.org/jira/browse/ARROW-6600
Project: Apache Arrow
Issue Type: Sub-task
Components: Java
Reporter: Ji Liu
Assignee: Ji Liu
Implement dictionary-encoded subfields for {{Union}} type. Each child vector
could be encodable or not.
Meanwhile extra common logic into {{DictionaryEncoder}} as well as refactor
List subfield encoding to keep consistent with {{Struct/Union}} type.
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