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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include "fieldsearcher.h"
#include <vespa/eval/eval/value_type.h>
#include <vespa/searchcommon/attribute/distance_metric.h>
#include <vespa/searchlib/query/streaming/nearest_neighbor_query_node.h>
#include <vespa/searchlib/queryeval/nearest_neighbor_distance_heap.h>
#include <vespa/searchlib/tensor/distance_calculator.h>
#include <vespa/searchlib/tensor/tensor_ext_attribute.h>
namespace search::fef { class IQueryEnvironment; }
namespace search::tensor { class TensorExtAttribute; }
namespace vsm {
/**
* Class used to perform exact nearest neighbor search over the streamed values of a tensor field.
*
* The raw score from the distance calculation is stored in NearestNeighborQueryNode instances
* searching this field.
*/
class NearestNeighborFieldSearcher : public FieldSearcher {
private:
class NodeAndCalc : search::streaming::NearestNeighborQueryNode::RawScoreCalculator {
public:
search::streaming::NearestNeighborQueryNode* node;
std::unique_ptr<search::tensor::DistanceCalculator> calc;
search::queryeval::NearestNeighborDistanceHeap heap;
NodeAndCalc(search::streaming::NearestNeighborQueryNode* node_in,
std::unique_ptr<search::tensor::DistanceCalculator> calc_in);
double to_raw_score(double distance) override;
};
search::attribute::DistanceMetric _metric;
std::unique_ptr<search::tensor::TensorExtAttribute> _attr;
std::vector<std::unique_ptr<NodeAndCalc>> _calcs;
public:
NearestNeighborFieldSearcher(FieldIdT fid,
search::attribute::DistanceMetric metric);
~NearestNeighborFieldSearcher() override;
std::unique_ptr<FieldSearcher> duplicate() const override;
void prepare(search::streaming::QueryTermList& qtl,
const SharedSearcherBuf& buf,
const vsm::FieldPathMapT& field_paths,
search::fef::IQueryEnvironment& query_env) override;
void onValue(const document::FieldValue& fv) override;
static search::attribute::DistanceMetric distance_metric_from_string(vespalib::stringref value);
};
}
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