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https://issues.apache.org/jira/browse/LUCENE-10620?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17555001#comment-17555001
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Adrien Grand commented on LUCENE-10620:
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I opened a draft PR that demonstrates the idea:
https://github.com/apache/lucene/pull/964.
> Can we pass the Weight to Collector?
> ------------------------------------
>
> Key: LUCENE-10620
> URL: https://issues.apache.org/jira/browse/LUCENE-10620
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Adrien Grand
> Priority: Minor
> Time Spent: 10m
> Remaining Estimate: 0h
>
> Today collectors cannot know about the Weight, and thus they cannot leverage
> {{Weight#count}}. {{IndexSearcher#count}} works around it by extending
> {{TotalHitCountCollector}} in order to shortcut counting the number of hits
> on a segment via {{Weight#count}} whenever possible.
> It works, but I would prefer this shortcut to work for all users of
> TotalHitCountCollector. For instance the faceting module creates a
> MultiCollector over a TotalHitCountCollector and a FacetCollector, and today
> it doesn't benefit from quick counts, which would enable it to only collect
> matches into a FacetCollector.
> I'm considering adding a new {{Collector#setWeight}} API to allow collectors
> to leverage {{Weight#count}}. I gave {{TotalHitCountCollector}} as an example
> above, but this could have applications for our top-docs collectors too,
> which could skip counting hits at all if the weight can provide them with the
> hit count up-front.
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