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From "Alan Woodward (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (LUCENE-6272) Scorer should not extend PostingsEnum
Date Sat, 21 Feb 2015 15:27:11 GMT

     [ https://issues.apache.org/jira/browse/LUCENE-6272?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Alan Woodward resolved LUCENE-6272.
-----------------------------------
       Resolution: Fixed
    Fix Version/s: 5.1
         Assignee: Alan Woodward

> 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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