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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 "queryterm.h"
#include <optional>
namespace search::streaming {
/*
* Nearest neighbor query node for streaming search.
*/
class NearestNeighborQueryNode: public QueryTerm {
public:
class RawScoreCalculator {
public:
virtual ~RawScoreCalculator() = default;
/**
* Convert the given distance to a raw score.
*
* This is used during unpacking, and also signals that the entire document was a match.
*/
virtual double to_raw_score(double distance) = 0;
};
private:
uint32_t _target_hits;
double _distance_threshold;
// When this value is set it also indicates a match for this query node.
std::optional<double> _distance;
RawScoreCalculator* _calc;
public:
NearestNeighborQueryNode(std::unique_ptr<QueryNodeResultBase> resultBase,
const string& query_tensor_name, const string& field_name,
uint32_t target_hits, double distance_threshold,
int32_t unique_id, search::query::Weight weight);
NearestNeighborQueryNode(const NearestNeighborQueryNode &) = delete;
NearestNeighborQueryNode & operator = (const NearestNeighborQueryNode &) = delete;
NearestNeighborQueryNode(NearestNeighborQueryNode &&) = delete;
NearestNeighborQueryNode & operator = (NearestNeighborQueryNode &&) = delete;
~NearestNeighborQueryNode() override;
bool evaluate() override;
void reset() override;
NearestNeighborQueryNode* as_nearest_neighbor_query_node() noexcept override;
const vespalib::string& get_query_tensor_name() const { return getTermString(); }
uint32_t get_target_hits() const { return _target_hits; }
double get_distance_threshold() const { return _distance_threshold; }
void set_raw_score_calc(RawScoreCalculator* calc_in) { _calc = calc_in; }
void set_distance(double value) { _distance = value; }
const std::optional<double>& get_distance() const { return _distance; }
// This is used during unpacking, and also signals to the RawScoreCalculator that the entire document was a match.
std::optional<double> get_raw_score() const;
};
}
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