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From "Doron Cohen (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-446) search.function - (1) score based on field value, (2) simple score customizability
Date Sat, 05 May 2007 07:21:15 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-446?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12493865
] 

Doron Cohen commented on LUCENE-446:
------------------------------------

Yonik (and other Solr's search.function people), 

I omitted some of the original functions/sources that were in your code: 
 -   LinearFloatFunction,   MaxFloatFunction,   ReciprocalFloatFunction, 
 -   OrdFieldSource,   ReverseOrdFieldSource

The first 3 should be straightforward to implemented by extending CustomScoreQuery, like the
code samples show. Do you think such implementations should be included, ready to use?

The last 2 Ord ones can be implemented as before, i.e. with the "expert" class ValueSource
that was kept. But they seemed spooky to me, with that comment regarding multi-searchers.
Are these just examples, or are they really useful? Do you think they should be included?

Thanks,
Doron

> 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.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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