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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:
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> 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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