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https://issues.apache.org/jira/browse/LUCENE-6272?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14330288#comment-14330288
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Robert Muir commented on LUCENE-6272:
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Thanks Alan!
> 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
> Assignee: Alan Woodward
> Priority: Minor
> Fix For: 5.1
>
> Attachments: LUCENE-6272.patch, LUCENE-6272.patch, LUCENE-6272.patch
>
>
> 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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