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https://issues.apache.org/jira/browse/LUCENE-9628?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17242585#comment-17242585
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Adrien Grand commented on LUCENE-9628:
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bq. In BooleanWeight#bulkScorer, we check if score mode is TOP_SCORES and if
so, force non-bulk scoring. Should we expand this to include modes like
TOP_DOCS?
I think so. DefaultBulkScorer seems to be the only bulk scorer which knows how
to deal with {{LeafCollector#competitiveIterator}}, so we seem to be disabling
the numeric sort optimization with boolean queries today? Let's switch to
ScoreMode#isExhaustive? What do you think [~mayyas]?
bq. In ConstantScoreQuery, we create the delegate weight with a hardcoded
COMPLETE_NO_SCORES. I'm not sure it actually causes problems, but it seems like
this doesn't handle TOP_DOCS correctly.
I suspect that this could be a problem if the wrapped query uses the ScoreMode
as an indication of whether it will need to handle
{{LeafCollector#competitiveIterator}} or not, which seems to be something we'd
like to do for boolean queries since BS1 (BooleanScorer) only really makes
sense if we know we're going to collect all matches.
I think it'd be helpful if we improved ScoreMode javadocs to be more explicit
regarding the expectations we have on scorers. TOP_SCORES mentions the
relationship with {{Scorer#setMinCompetitiveScore}}, we should add something
similar to TOP_DOCS and TOP_DOCS_WITH_SCORES regarding bulk scorers and
{{LeafCollector#competitiveIterator}}?
> Make sure to account for ScoreMode.TOP_DOCS in queries
> ------------------------------------------------------
>
> Key: LUCENE-9628
> URL: https://issues.apache.org/jira/browse/LUCENE-9628
> Project: Lucene - Core
> Issue Type: Test
> Components: core/search
> Reporter: Julie Tibshirani
> Priority: Minor
>
> I noticed a few places where we are directly check the {{ScoreMode}} type
> that should perhaps be generalized. These could affect whether numeric sort
> optimization is applied:
> * In {{BooleanWeight#bulkScorer}}, we check if score mode is {{TOP_SCORES}}
> and if so, force non-bulk scoring. Should we expand this to include modes
> like {{TOP_DOCS}}?
> * In {{ConstantScoreQuery}}, we create the delegate weight with a hardcoded
> {{COMPLETE_NO_SCORES}}. I'm not sure it actually causes problems, but it
> seems like this doesn't handle {{TOP_DOCS}} correctly.
> Apologies this issue isn’t more precise – I am not up-to-speed on the numeric
> sort optimization but wanted to raise these in case they’re helpful.
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