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https://issues.apache.org/jira/browse/LUCENE-10123?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17421204#comment-17421204
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ASF subversion and git services commented on LUCENE-10123:
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Commit 7357bdc272dc26c1289c613716c3ff269c9e9389 in lucene's branch
refs/heads/main from Adrien Grand
[ https://gitbox.apache.org/repos/asf?p=lucene.git;h=7357bdc ]
LUCENE-10123: Handling of singletons in DocValuesConsumer. (#320)
This avoids double wrapping of doc values in `Lucene90DocValuesConsumer`.
> Avoid double wrapping of doc values at merge time
> -------------------------------------------------
>
> Key: LUCENE-10123
> URL: https://issues.apache.org/jira/browse/LUCENE-10123
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Adrien Grand
> Priority: Minor
> Time Spent: 1h
> Remaining Estimate: 0h
>
> If you have a SORTED_SET/SORTED_NUMERIC doc values that are effectively
> single-valued, the Lucene90 doc-values format internally stores them the same
> way that it stores SORTED/NUMERIC doc values, and they get wrapped with a
> singleton wrapper ({{DocValues::singleton}}) at read time.
> However {{DocValuesConsumer}} doesn't optimize for singletons, which means
> that the merging process will create a merged view of the singleton wrappers,
> and that Lucene90DocValuesConsumer will then wrap this back to a
> single-valued view using {{SortedSetSelector}}.
> I think it would be simpler if {{DocValuesConsumer}} detected singleton
> wrappers, unwrapped them, created a SORTED/NUMERIC merged view and only then
> wrapped it with a singleton wrapper so that {{SortedSetSelector}} would just
> unwrap it?
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