Adrien Grand created LUCENE-6184:
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Summary: BooleanScorer should better deal with sparse clauses
Key: LUCENE-6184
URL: https://issues.apache.org/jira/browse/LUCENE-6184
Project: Lucene - Core
Issue Type: Improvement
Reporter: Adrien Grand
Assignee: Adrien Grand
Priority: Minor
Fix For: Trunk, 5.1
The way that BooleanScorer works looks like this:
{code}
for each (window of 2048 docs) {
for each (optional scorer) {
scorer.score(window)
}
}
{code}
This is not efficient for very sparse clauses (doc freq much lower than
maxDoc/2048) since we keep on scoring windows of documents that do not match
anything. BooleanScorer2 currently performs better in those cases.
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