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https://issues.apache.org/jira/browse/ARROW-6484?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Micah Kornfield resolved ARROW-6484.
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Fix Version/s: 0.15.0
Resolution: Fixed
Issue resolved by pull request 5321
[https://github.com/apache/arrow/pull/5321]
> [Java] Enable create indexType for DictionaryEncoding according to dictionary
> value count
> -----------------------------------------------------------------------------------------
>
> Key: ARROW-6484
> URL: https://issues.apache.org/jira/browse/ARROW-6484
> Project: Apache Arrow
> Issue Type: Improvement
> Components: Java
> Reporter: Ji Liu
> Assignee: Ji Liu
> Priority: Major
> Labels: pull-request-available
> Fix For: 0.15.0
>
> Time Spent: 0.5h
> Remaining Estimate: 0h
>
> Currently, when create {{DictionaryEncoding}}, we need to specify indexType,
> and it use Int(32, true) as default if this value is null.
> Actually, when dictionary valueCount is small, we should use
> Int(8,true)/Int(16,true) instead to reduce memory allocation.
> This issue is about to provide API for creating indexType according to
> valueCount and apply it to avro adapter for enum type.
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