MultiPhraseQuery sums its own idf instead of Similarity.
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Key: LUCENE-2879
URL: https://issues.apache.org/jira/browse/LUCENE-2879
Project: Lucene - Java
Issue Type: Bug
Components: Query/Scoring
Reporter: Robert Muir
Assignee: Robert Muir
Fix For: 2.9.5, 3.0.4, 3.1, 4.0
MultiPhraseQuery is a generalized version of PhraseQuery, and computes IDF the
same way by default (by summing across the terms).
The problem is it doesn't let the Similarity do this: PhraseQuery calls
Similarity.idfExplain(Collection<Term> terms, IndexSearcher searcher),
but MultiPhraseQuery just sums itself, calling Similarity.idf(int, int) for
each term.
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