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https://issues.apache.org/jira/browse/LUCENE-2880?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13686631#comment-13686631
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Adam Ringel commented on LUCENE-2880:
-------------------------------------
I subclassed DefaultSimilarity to work around this.
Seemed simple enough.
{code}
public class LUCENE2880_SloppyFreqDistanceAdjuster {
private static Logger logger =
Logger.getLogger(LUCENE2880_SloppyFreqDistanceAdjuster.class);
public int distance(int distance) {
if(distance < 2) {
logger.warn("distance - distacne is <, 2, has
LUCENE-2880 been resolved?");
return 0;
}
return distance - 2;
}
}
public class LUCENE2880_DefaultSimilarity extends DefaultSimilarity {
private static final long serialVersionUID = 1L;
private static final LUCENE2880_SloppyFreqDistanceAdjuster ADJUSTER =
new LUCENE2880_SloppyFreqDistanceAdjuster();
@Override
public float sloppyFreq(int distance) {
return super.sloppyFreq(ADJUSTER.distance(distance));
}
}
{code}
> 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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