[ARROW-6600] [Java] Implement dictionary-encoded subfields for Union type

• Type: Sub-task
• Status: Closed
• Priority: Major
• Resolution: Later
• Component/s: Java
• Labels: pull-request-available
• External issue URL: https://github.com/apache/arrow/issues/22956
• Assignee: Ji Liu
• Reporter: Ji Liu
• Created: 18/Sep/19 14:50
• Updated: 11/Jan/23 07:48
• Resolved: 15/Nov/19 06:31

Description

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.

 

Issue Links

• links to: GitHub Pull Request #5422