Add score threshold into Scorer.score()
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Key: LUCENE-3364
URL: https://issues.apache.org/jira/browse/LUCENE-3364
Project: Lucene - Java
Issue Type: Improvement
Components: core/query/scoring
Reporter: John Wang
This is an optimization for scoring.
Given a Scorer.score() implementation, where features are gathered to calculate
a score.
Proposal, add a parameter to score, e.g. score(float threshold)
This threshold is the minimum score to "beat" to make it to the current
PriorityQueue. This could potential save a great deal of wasted calculation in
the cases where recall is large.
In our case specifically, some of the features needed to do calculation can be
expensive to obtain, it would be nice to have a place to decide whether or not
even fetching these features are necessary.
Also, if we know the score would be low, simply threshold can be returned.
Let me know if this makes sense and I can work on a patch.
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