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https://issues.apache.org/jira/browse/LUCENE-446?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12481936
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Grant Ingersoll commented on LUCENE-446:
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Is there any motivation out there to push this down from Solr to Lucene? I see
from time to time on java-user that it comes in handy for people using Lucene.
What do the Solr people think about moving it into 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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