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https://issues.apache.org/jira/browse/ARROW-6600?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ji Liu closed ARROW-6600.
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Resolution: Later
> [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
> Priority: Major
> Labels: pull-request-available
> Time Spent: 1.5h
> Remaining Estimate: 0h
>
> 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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