Matcher
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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
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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