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https://issues.apache.org/jira/browse/LUCENE-10189?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17430647#comment-17430647
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Robert Muir commented on LUCENE-10189:
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For the SortedSetCase, seems like we want to fix the IW component to use
{{DocValues.singleton}}, box it up, and return it from {{SortedSetDocValues
getDocValues()}} ?
Then the DocValuesConsumer can simply check with {{DocValues.unwrapSingleton}}.
The same codepath can work for merge and flush.
> Optimize SortedSet/SortedNumeric doc values writers for fields that are
> effectively single-valued
> -------------------------------------------------------------------------------------------------
>
> Key: LUCENE-10189
> URL: https://issues.apache.org/jira/browse/LUCENE-10189
> Project: Lucene - Core
> Issue Type: Wish
> Reporter: Adrien Grand
> Priority: Minor
>
> I was wondering how much overhead multi-valued doc-value types have over
> their single-valued counterparts, so I hacked IndexTaxis to index all
> doc-value fields via Sorted(Set|Numeric)DocValuesField instead of
> (Sorted|Numeric)DocValuesField and flush times increased by 30%. It should be
> easy to automatically detect such cases in the doc values writers?
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