add maxtf to fieldinvertstate
-----------------------------
Key: LUCENE-2864
URL: https://issues.apache.org/jira/browse/LUCENE-2864
Project: Lucene - Java
Issue Type: New Feature
Components: Query/Scoring
Reporter: Robert Muir
Fix For: 3.1, 4.0
Attachments: LUCENE-2864.patch
the maximum within-document TF is a very useful scoring value,
we should expose it so that people can use it in scoring
consider the following sim:
{code}
@Override
public float idf(int docFreq, int numDocs) {
return 1.0F; /* not used */
}
@Override
public float computeNorm(String field, FieldInvertState state) {
return state.getBoost() / (float) Math.sqrt(state.getMaxTF());
}
{code}
which is surprisingly effective, but more interesting for practical reasons.
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