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https://issues.apache.org/jira/browse/LUCENE-446?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12501082
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Hoss Man commented on LUCENE-446:
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Doron: I haven't really been able to keep up with the way this issue has
evolved, or dig into your new patches, but to answer your question about the
Ord functions: yes they are very useful, and it active use in Solr. I believe
the warning about MultiSearcher mainly has to do with the fact that the
MultiSearcher/FieldCache APIs give us know way to know the "lowest" of
"highest" value in a field cache across an entire logical index, so the Ord
functions can't really be queried against a MultiSearcher.
> 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
> Assignee: 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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