Alan Woodward created LUCENE-6278:
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Summary: Rationalise Scorer.freq()
Key: LUCENE-6278
URL: https://issues.apache.org/jira/browse/LUCENE-6278
Project: Lucene - Core
Issue Type: Improvement
Reporter: Alan Woodward
Priority: Minor
At the moment, Scorer.freq() does different things depending on the Scorer
implementation:
* TermScorer and the phrase scorers return the frequency of that term or phrase
in the current document. TermScorer.freq() is not actually called anywhere
(apart from in a couple of tests), and {X}PhraseScorer.freq() is only called in
PhraseWeight.explain()
* The various Boolean scorers return the number of matching subscorers, and are
used for coord calculations.
I think this is confusing. I propose that we instead add a new coord() method
to Scorer that by default returns 1, and that is overridden by the boolean
scorers; and that we just remove freq() entirely. PhraseWeight.explain() can
call a package-private method on {X}PhraseScorer.
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