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From "Uwe Schindler (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (LUCENE-2880) SpanQuery scoring inconsistencies
Date Thu, 09 May 2013 23:05:57 GMT

     [ https://issues.apache.org/jira/browse/LUCENE-2880?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Uwe Schindler updated LUCENE-2880:
----------------------------------

    Fix Version/s:     (was: 4.3)
                   4.4
    
> SpanQuery scoring inconsistencies
> ---------------------------------
>
>                 Key: LUCENE-2880
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2880
>             Project: Lucene - Core
>          Issue Type: Bug
>            Reporter: Robert Muir
>             Fix For: 4.4
>
>         Attachments: LUCENE-2880.patch
>
>
> Spinoff of LUCENE-2879.
> You can see a full description there, but the gist is that SpanQuery sums up freqs with
"sloppyFreq".
> However this slop is simply spans.end() - spans.start()
> For a SpanTermQuery for example, this means its scoring 0.5 for TF versus TermQuery's
1.0.
> As you can imagine, I think in practical situations this would make it difficult for
SpanQuery users to
> really use SpanQueries for effective ranking, especially in combination with non-Spanqueries
(maybe via DisjunctionMaxQuery, etc)
> The problem is more general than this simple example: for example SpanNearQuery should
be consistent with PhraseQuery's slop.

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