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https://issues.apache.org/jira/browse/LUCENE-5834?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14068424#comment-14068424
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ASF subversion and git services commented on LUCENE-5834:
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Commit 1612251 from [~jpountz] in branch 'dev/trunk'
[ https://svn.apache.org/r1612251 ]
LUCENE-5834: Empty sorted set and numeric doc values are now singletons.
> 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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