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https://issues.apache.org/jira/browse/LUCENE-446?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12492378
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Doron Cohen commented on LUCENE-446:
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I intend to take a shot at this, with the approach of two parts/steps -
1) simple scoring based on values of stored field.
2) composing a document score as (some / math / extensible) function of one
or more scores of sub queries.
Thinking of a new package: o.a.l.search.function.
This would seem to bring together LUCENE-446 and LUCENE-850 and I think would
be handy for trying various scoring techniques.
(Background/motivation: I was considering using payloads for trying some
static scoring alternatives (e.g. link info based), but I realized that
function queries are much more suitable for this, and would be a handy addition
to Lucene core.)
> 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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