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https://issues.apache.org/jira/browse/LUCENE-5207?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13767542#comment-13767542
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Robert Muir commented on LUCENE-5207:
-------------------------------------
{quote}
Finally its simple: Once we allow foreign, user-defined functions, we must add
the Classloader argument to the compiler again, otherwise you cannot register
methods from classes of foreign classloaders. An alternative would be to let
the compiler figure out himself by passing a list of java.lang.reflect.Method
and it chooses the correct classloader automatically.
{quote}
I think we can add this to the second method signature?
> lucene expressions module
> -------------------------
>
> Key: LUCENE-5207
> URL: https://issues.apache.org/jira/browse/LUCENE-5207
> Project: Lucene - Core
> Issue Type: New Feature
> Reporter: Ryan Ernst
> Attachments: LUCENE-5207.patch
>
>
> Expressions are geared at defining an alternative ranking function (e.g.
> incorporating the text relevance score and other field values/ranking
> signals). So they are conceptually much more like ElasticSearch's scripting
> support (http://www.elasticsearch.org/guide/reference/modules/scripting/)
> than solr's function queries.
> Some additional notes:
> * In addition to referring to other fields, they can also refer to other
> expressions, so they can be used as "computed fields".
> * You can rank documents easily by multiple expressions (its a SortField at
> the end), e.g. Sort by year descending, then some function of score price and
> time ascending.
> * The provided javascript expression syntax is much more efficient than using
> a scripting engine, because it does not have dynamic typing (compiles to
> .class files that work on doubles). Performance is similar to writing a
> custom FieldComparator yourself, but much easier to do.
> * We have solr integration to contribute in the future, but this is just the
> standalone lucene part as a start. Since lucene has no schema, it includes an
> implementation of Bindings (SimpleBindings) that maps variable names to
> SortField's or other expressions.
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