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From "Marvin Humphrey (JIRA)" <>
Subject [jira] Updated: (LUCY-111) Matcher
Date Wed, 16 Jun 2010 19:02:27 GMT


Marvin Humphrey updated LUCY-111:

    Attachment: Matcher.bp

> Matcher
> -------
>                 Key: LUCY-111
>                 URL:
>             Project: Lucy
>          Issue Type: New Feature
>          Components: Core - Search
>            Reporter: Marvin Humphrey
>            Assignee: Marvin Humphrey
>            Priority: Blocker
>         Attachments: Matcher.bp, Matcher.c
> A Matcher is an object which matches a set of Lucy doc ids, iterating over
> them via Next() and Advance().  It combines the roles of Lucene's
> DocIdSetIterator and Scorer classes.
> Some -- but not all -- Matchers implement a Score() method.  We can refer to
> such Matchers informally as "scorers", but Lucy won't need a Scorer class a la
> Lucene.   In Lucy, Query classes will compile down to Matchers that either
> Score() or don't.  This allows us to perform optimizations on branches of
> compound scorers: compiling "foo AND NOT bar" will produce a scoring Matcher
> for "foo" and a non-scoring Matcher for "bar", since the "bar" branch can
> never contribute to the score.

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