[jira] Updated: (LUCENE-2879) MultiPhraseQuery sums its own idf instead of Similarity.

["Robert Muir (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/LUCENE-2879?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Robert Muir updated LUCENE-2879:
--------------------------------

    Attachment: LUCENE-2879.patch

patch, i added a test for this.

> MultiPhraseQuery sums its own idf instead of Similarity.
> --------------------------------------------------------
>
>                 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
>
>         Attachments: LUCENE-2879.patch
>
>
> 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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