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Date: Sun, 28 Feb 2010 09:19:05 +0000 (UTC)
From: "Robert Muir (JIRA)" <jira@apache.org>
To: java-dev@lucene.apache.org
Subject: [jira] Resolved: (LUCENE-2286) enable
 DefaultSimilarity.setDiscountOverlaps by default
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     [ https://issues.apache.org/jira/browse/LUCENE-2286?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Robert Muir resolved LUCENE-2286.
---------------------------------

    Resolution: Fixed

Committed revision 917148.

> enable DefaultSimilarity.setDiscountOverlaps by default
> -------------------------------------------------------
>
>                 Key: LUCENE-2286
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2286
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: Query/Scoring
>            Reporter: Robert Muir
>            Assignee: Robert Muir
>             Fix For: 3.1
>
>         Attachments: LUCENE-2286.patch
>
>
> I think we should enable setDiscountOverlaps in DefaultSimilarity by default.
> If you are using synonyms or commongrams or a number of other 0-posInc-term-injecting methods, these currently screw up your length normalization.
> These terms have a position increment of zero, so they shouldnt count towards the length of the document.
> I've done relevance tests with persian showing the difference is significant, and i think its a big trap to anyone using synonyms, etc: your relevance can actually get worse if you don't flip this boolean flag.

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