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https://issues.apache.org/jira/browse/LUCY-111?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Marvin Humphrey updated LUCY-111:
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Attachment: Matcher.pm
> Matcher
> -------
>
> Key: LUCY-111
> URL: https://issues.apache.org/jira/browse/LUCY-111
> Project: Lucy
> Issue Type: New Feature
> Components: Core - Search
> Reporter: Marvin Humphrey
> Assignee: Marvin Humphrey
> Priority: Blocker
> Attachments: Matcher.bp, Matcher.c, Matcher.pm
>
>
> 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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