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https://issues.apache.org/jira/browse/LUCENE-446?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12483878
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Yonik Seeley commented on LUCENE-446:
-------------------------------------

> i think once upon a time Yonik held off because he wasn't sure if he liked 
> the API

Right... it's just never been at the top of my list to revisit.

The main thing I was wondering is if I should have a whole ValueSource thing... 
perhaps FunctionQuery should be able to use other Queries directly.  For 
example, one could have
MultiplyFunctionQuery(MyNormalQuery, MyFieldFunctionQuery) to boost a query by 
another query (in this case a function query).

Right now, increasing the score of a document based on a field value is done in 
an additive way by adding a FunctionQuery clause to a BooleanQuery.  One could 
create a ValueSource that wraps another query to get a multiplicative effect, 
but is that the simplest approach?


> FunctionQuery - score based on field value
> ------------------------------------------
>
>                 Key: LUCENE-446
>                 URL: https://issues.apache.org/jira/browse/LUCENE-446
>             Project: Lucene - Java
>          Issue Type: New Feature
>          Components: Search
>    Affects 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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