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https://issues.apache.org/jira/browse/LUCENE-8935?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16893713#comment-16893713
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Jim Ferenczi commented on LUCENE-8935:
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Sorry I misunderstood the logic but the number of scoring clauses is already
computed from the pruned list of scorers so the actual patch works. It's the
scorer supplier that can be null but in such case they would not appear in
Boolean2ScorerSupplier.
> BooleanQuery with no scoring clauses cannot skip documents when running
> TOP_SCORES mode
> ---------------------------------------------------------------------------------------
>
> Key: LUCENE-8935
> URL: https://issues.apache.org/jira/browse/LUCENE-8935
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Jim Ferenczi
> Priority: Minor
> Attachments: LUCENE-8935.patch
>
>
> Today a boolean query that is composed of filtering clauses only (more than
> one) cannot skip documents when the search is executed with the TOP_SCORES
> mode. However since all documents have a score of 0 it should be possible to
> early terminate the query as soon as we collected enough top hits. Wrapping
> the resulting boolean scorer in a constant score scorer should allow early
> termination in this case and would speed up the retrieval of top hits case
> considerably if the total hit count is not requested.
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