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https://issues.apache.org/jira/browse/LUCENE-8613?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16724061#comment-16724061
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Alan Woodward commented on LUCENE-8613:
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If you're happy treating multi-valued fields as a set, then you can write a
LongValuesSource implementation that counts the number of values in the set
when advanceExact() is called - having a look at how
LongValuesSource.FieldValuesSource works should give you a good start.
> CoveringQuery to use multi-valued field length as minimum match
> ---------------------------------------------------------------
>
> Key: LUCENE-8613
> URL: https://issues.apache.org/jira/browse/LUCENE-8613
> Project: Lucene - Core
> Issue Type: Improvement
> Affects Versions: 7.5
> Reporter: Tristan Stevens
> Priority: Minor
>
> Currently CoveringQuery uses a long field's value for the minimumMatch for
> each document.
> There are use cases where this value may be derived from the length of a
> multi-valued field (including docValues).
> This request is to support an alternative constructor and implementation for
> CoveringQuery to take a field name that can be used for the per-document
> minimum match value.
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