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https://issues.apache.org/jira/browse/LUCENE-5834?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Adrien Grand updated LUCENE-5834:
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Attachment: LUCENE-5834.patch
Patch.
> Make empty doc values impls singletons
> --------------------------------------
>
> Key: LUCENE-5834
> URL: https://issues.apache.org/jira/browse/LUCENE-5834
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Adrien Grand
> Assignee: Adrien Grand
> Priority: Trivial
> Fix For: 5.0, 4.10
>
> Attachments: LUCENE-5834.patch
>
>
> Making these empty instances singletons would allow to use
> {{unwrapSingleton}} to check if they are single-valued.
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