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From "Robert Muir (JIRA)" <j...@apache.org>
Subject [jira] Updated: (LUCENE-2286) enable DefaultSimilarity.setDiscountOverlaps by default
Date Thu, 25 Feb 2010 14:39:28 GMT

     [ https://issues.apache.org/jira/browse/LUCENE-2286?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Robert Muir updated LUCENE-2286:
--------------------------------

    Attachment: LUCENE-2286.patch

attached is a patch, with backwards-break in CHANGES.

> 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
>         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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