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Date: Sun, 3 Jun 2007 19:38:15 -0700 (PDT)
From: "Hoss Man (JIRA)" <jira@apache.org>
To: java-dev@lucene.apache.org
Subject: [jira] Commented: (LUCENE-446) search.function - (1) score based on
 field value, (2) simple score customizability
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    [ https://issues.apache.org/jira/browse/LUCENE-446?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12501082 ] 

Hoss Man commented on LUCENE-446:
---------------------------------

Doron: I haven't really been able to keep up with the way this issue has evolved, or dig into your new patches, but to answer your question about the Ord functions: yes they are very useful, and it active use in Solr.  I believe the warning about MultiSearcher mainly has to do with the fact that the MultiSearcher/FieldCache APIs give us know way to know the "lowest" of "highest" value in a field cache across an entire logical index, so the Ord functions can't really be queried against a MultiSearcher.

> 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
>            Assignee: Doron Cohen
>            Priority: Minor
>             Fix For: 2.2
>
>         Attachments: function.patch.txt, 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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