Chris M. Hostetter created SOLR-17951:
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Summary: Optimize re-ranking based on "functions"
Key: SOLR-17951
URL: https://issues.apache.org/jira/browse/SOLR-17951
Project: Solr
Issue Type: Improvement
Reporter: Chris M. Hostetter
Lucene 10.3 added a {{DoubleValuesSourceRescorer}} alternative to the existing
{{QueryRescorer}} as way to re-rank documents based on {{DoubleValues}} w/o
needing the overhead of a query wrapper.
I took a stab at refactoring the existing logic in {{ReRankQParserPlugin}} to
try and "optimize" situations where the {{reRankQuery}} is a "function" based
query by unwrapping it to get the underlying {{ValueSource}} (or
{{DoubleValuesSource}}) -- similar to how {{QParser.parseAsValueSource()}}
avoids an unnecessary {{QueryValueSource}} wrapper if the underlying QParser
returns a "function" query.
ie: make this faster...
{noformat}
rq={!rerank reRankQuery=$rrq}
rrq={!func}something(cool)
{noformat}
I'll attach my patch, but (un)fortunately it caused
{{TestDenseVectorFunctionQuery}} to help uncover [a lucene
bug|https://github.com/apache/lucene/issues/15328] in
{{VectorSimilarityFunction}} ... so we should either wait for that to be fixed,
or perhaps write our own substitute for {{ValueSource.asDoubleValuesSource()}}
that _explicitly_ calls {{floatVal(doc)}} to work around the issue
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