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https://issues.apache.org/jira/browse/LUCENE-7623?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Alan Woodward updated LUCENE-7623:
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Attachment: LUCENE-7623.patch
Here is a patch with two new queries, FunctionScoreQuery and FunctionMatchQuery.
* FunctionScoreQuery takes a query to wrap and a DoubleValuesSource, and
modifies the internal query's score using the per-document values. This can
act as a replacement for FunctionQuery using a constant or per-field
DoubleValuesSource, or as a replacement for CustomScoreQuery or BoostedQuery
using an expression. The wrapped query's scores are passed to any DoubleValues
created via getValues(LeafReaderContext, DoubleValues).
* FunctionMatchQuery takes a DoubleValuesSource and a Predicate<Double>, and
returns any documents with a value that matches the predicate. It works by
linear scan, but uses two-phase iteration so it should be efficient when
combined with a more restrictive query. Unlike FunctionRangeQuery, it returns
a constant score, so if you want to use the DoubleValues as scores, you will
need to wrap it with a FunctionScoreQuery.
The patch also adds some more informative toString() implementations to
expressions and field DoubleValues, to make the Explanations for
FunctionScoreQuery more useful.
> Add FunctionScoreQuery and FunctionMatchQuery
> ---------------------------------------------
>
> Key: LUCENE-7623
> URL: https://issues.apache.org/jira/browse/LUCENE-7623
> Project: Lucene - Core
> Issue Type: New Feature
> Reporter: Alan Woodward
> Assignee: Alan Woodward
> Priority: Minor
> Attachments: LUCENE-7623.patch
>
>
> We should update the various function scoring queries to use the new
> DoubleValues API
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