eliaporciani opened a new pull request, #12253:
URL: https://github.com/apache/lucene/pull/12253
### Description
Add function queries for computing similarity scores between knn vectors.
Example:
```java
var v1 = new DenseVectorFloatConstValueSource(List.of(1, 2, 4));
var v2 = new DenseVectorFloatFieldSource("knnFloatField");
var functionQuery = new FunctionQuery(
new
FloatDenseVectorSimilarityFunction(VectorSimilarityFunction.EUCLIDEAN, v1, v2));
```
link to the issue: https://github.com/apache/lucene/issues/12252
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