Adrien Grand created LUCENE-6850:
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Summary: 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
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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