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https://issues.apache.org/jira/browse/LUCENE-6850?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Adrien Grand updated LUCENE-6850:
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Attachment: LUCENE-6850.patch
Here is a patch. BooleanWeight.bulkScorer now has the same optimization as
BooleanWeight.scorer in the case that only one of the optional clauses creates
a non-null scorer.
> BooleanWeight should not use BS1 when there is a single non-null clause
> -----------------------------------------------------------------------
>
> Key: LUCENE-6850
> URL: https://issues.apache.org/jira/browse/LUCENE-6850
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Adrien Grand
> Assignee: Adrien Grand
> Priority: Minor
> Attachments: LUCENE-6850.patch
>
>
> When a disjunction has a single non-null scorer, we still use BS1 for
> bulk-scoring, which first collects matches into a bit set and then calls the
> collector. This is inefficient: we should just call the inner bulk scorer
> directly and wrap the scorer to apply the coord factor (like
> BooleanTopLevelScorers.BoostedScorer does).
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