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https://issues.apache.org/jira/browse/ARROW-6185?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Micah Kornfield resolved ARROW-6185.
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Resolution: Fixed
Fix Version/s: 0.15.0
Issue resolved by pull request 5054
[https://github.com/apache/arrow/pull/5054]
> [Java] Provide hash table based dictionary builder
> --------------------------------------------------
>
> Key: ARROW-6185
> URL: https://issues.apache.org/jira/browse/ARROW-6185
> Project: Apache Arrow
> Issue Type: New Feature
> Components: Java
> Reporter: Liya Fan
> Assignee: Liya Fan
> Priority: Major
> Labels: pull-request-available
> Fix For: 0.15.0
>
> Time Spent: 2h
> Remaining Estimate: 0h
>
> This is related ARROW-5862. We provide another type of dictionary builder
> based on hash table. Compared with a search based dictionary encoder, a hash
> table based encoder process each new element in O(1) time, but require extra
> memory space.
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