Alan Woodward created LUCENE-6272:
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Summary: Scorer should not extend PostingsEnum
Key: LUCENE-6272
URL: https://issues.apache.org/jira/browse/LUCENE-6272
Project: Lucene - Core
Issue Type: Improvement
Reporter: Alan Woodward
Priority: Minor
Scorer currently has to implement a whole bunch of methods that are never
called. The only method that Scorer uses in addition to the methods on
DocIdSetIterator is freq(), and as currently implemented this means different
things on different Scorers:
* TermScorer returns its underlying termfreq
* MinShouldMatchScorer returns how many of its subscorers are matching
* {Exact|Sloppy}PhraseScorer returns how many phrases it has found on a document
In addition, freq() is never actually called on TermScorer, and it's only used
in explain() on the phrase scorers.
We should make Scorer extend DocIdSetIterator instead. In place of freq(),
Scorer would have a coord() method that by default returns 1, and for boolean
scorers returns how many subscorers are matching.
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