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https://issues.apache.org/jira/browse/LUCENE-8099?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16294508#comment-16294508
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David Smiley commented on LUCENE-8099:
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Oh, you're right of course about the dependency; I missed the "test" scope.
RE DoubleValueSource helper: which issue do you refer to? I'd like to learn
more. I found LUCENE-7736 though the committed code does show that the lambdas
/ "ReaderFunction" instances are in fact compared for equality in
org.apache.lucene.queries.function.IndexReaderFunctions.IndexReaderDoubleValuesSource
I think score-multiplication is extremely common. I like the utility method
you did here for Solr but that's harder to do in Lucene land because it uses
various modules (expressions + queries) that don't depend on each other. If we
were to reconsider adding more direct functionality for this, perhaps it might
add no new _public_ classes -- just a static factory method on
FunctionScoreQuery? Something to consider.
> Deprecate CustomScoreQuery, BoostedQuery and BoostingQuery
> ----------------------------------------------------------
>
> Key: LUCENE-8099
> URL: https://issues.apache.org/jira/browse/LUCENE-8099
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Alan Woodward
> Assignee: Alan Woodward
> Priority: Minor
> Attachments: LUCENE-8099.patch
>
>
> After LUCENE-7998, these three queries can all be replaced by a
> FunctionScoreQuery. Using lucene-expressions makes them much easier to use
> as well.
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