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https://issues.apache.org/jira/browse/LUCENE-446?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12493297
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Doron Cohen commented on LUCENE-446:
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javadocs for the new org.apache.lucene.search.function package
can now be reviewed at http://people.apache.org/~doronc/api
> search.function - (1) score based on field value, (2) simple score
> customizability
> ----------------------------------------------------------------------------------
>
> Key: LUCENE-446
> URL: https://issues.apache.org/jira/browse/LUCENE-446
> Project: Lucene - Java
> Issue Type: New Feature
> Components: Search
> Reporter: Yonik Seeley
> Assigned To: Doron Cohen
> Priority: Minor
> Fix For: 2.2
>
> Attachments: function.patch.txt, function.zip, function.zip
>
>
> FunctionQuery can return a score based on a field's value or on it's ordinal
> value.
> FunctionFactory subclasses define the details of the function. There is
> currently a LinearFloatFunction (a line specified by slope and intercept).
> Field values are typically obtained from FieldValueSourceFactory.
> Implementations include FloatFieldSource, IntFieldSource, and OrdFieldSource.
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