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https://issues.apache.org/jira/browse/ARROW-5883?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ASF GitHub Bot updated ARROW-5883:
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Labels: pull-request-available (was: )
> [Java] Support Dictionary Encoding for List type
> ------------------------------------------------
>
> Key: ARROW-5883
> URL: https://issues.apache.org/jira/browse/ARROW-5883
> Project: Apache Arrow
> Issue Type: Improvement
> Components: Java
> Reporter: Ji Liu
> Assignee: Ji Liu
> Priority: Minor
> Labels: pull-request-available
>
> As described in
> [http://arrow.apache.org/docs/format/Layout.html#dictionary-encoding], List
> type encoding should be supported.
> Now ListVector getObject returns a ArrayList implementation, and its equals
> and hashCode are already overwritten, so it could be directly supported to be
> hashMap key in DictionaryEncoder. Since we won't change Dictionary data
> during encoding/decoding process, use mutable key seems dose't matter.
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