[LUCENE-2879] MultiPhraseQuery sums its own idf instead of Similarity.

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 3.1, 4.0-ALPHA
• Component/s: core/query/scoring
• Lucene Fields: New, Patch Available
• Assignee: Robert Muir
• Reporter: Robert Muir
• Created: 23/Jan/11 05:43
• Updated: 28/Aug/22 12:39
• Resolved: 24/Jan/11 03:53

Description

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.