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Date: Thu, 2 Mar 2006 19:56:39 +0100 (CET)
From: "Yonik Seeley (JIRA)" <jira@apache.org>
To: java-dev@lucene.apache.org
Subject: [jira] Commented: (LUCENE-446) FunctionQuery - score based on field
 value
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    [ http://issues.apache.org/jira/browse/LUCENE-446?page=comments#action_12368570 ] 

Yonik Seeley commented on LUCENE-446:
-------------------------------------

This version is now slightly out of date.
For now, consider the definitive version to be in Solr:
http://incubator.apache.org/solr
http://svn.apache.org/viewcvs.cgi/incubator/solr/trunk/src/java/org/apache/solr/search/function/

Solr currently has a QueryParser hack to parse a FunctionQuery...  you use _val_ as the fieldName to create a FunctionQuery
Examples:
  _val_:myfield
 _val_:"max(myfield,2.0)"
 _val_:"max(linear(myfield,1.0,.1), 5.0)"


> FunctionQuery - score based on field value
> ------------------------------------------
>
>          Key: LUCENE-446
>          URL: http://issues.apache.org/jira/browse/LUCENE-446
>      Project: Lucene - Java
>         Type: New Feature
>   Components: Search
>     Versions: 1.9
>     Reporter: Yonik Seeley
>  Attachments: 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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