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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include "wand_parts.h"
#include "weak_and_heap.h"
#include <vespa/searchlib/queryeval/searchiterator.h>
#include <vespa/searchlib/fef/matchdata.h>
#include <vespa/searchlib/fef/termfieldmatchdata.h>
namespace search::queryeval {
/**
* WAND search iterator that uses a shared heap between match threads.
*/
struct ParallelWeakAndSearch : public SearchIterator
{
using score_t = wand::score_t;
using docid_t = wand::docid_t;
/**
* Params used to tweak the behavior of the WAND algorithm.
*/
struct MatchParams
{
WeakAndHeap &scores;
score_t scoreThreshold;
double thresholdBoostFactor;
uint32_t scoresAdjustFrequency;
docid_t docIdLimit;
MatchParams(WeakAndHeap &scores_,
score_t scoreThreshold_,
double thresholdBoostFactor_,
uint32_t scoresAdjustFrequency_)
: scores(scores_),
scoreThreshold(scoreThreshold_),
thresholdBoostFactor(thresholdBoostFactor_),
scoresAdjustFrequency(scoresAdjustFrequency_),
docIdLimit(0)
{}
MatchParams &setDocIdLimit(docid_t value) {
docIdLimit = value;
return *this;
}
};
/**
* Params used for rank calculation.
*/
struct RankParams
{
fef::TermFieldMatchData &rootMatchData;
fef::MatchData::UP childrenMatchData;
RankParams(fef::TermFieldMatchData &rootMatchData_,
fef::MatchData::UP &&childrenMatchData_)
: rootMatchData(rootMatchData_),
childrenMatchData(std::move(childrenMatchData_))
{}
};
using Terms = wand::Terms;
virtual size_t get_num_terms() const = 0;
virtual int32_t get_term_weight(size_t idx) const = 0;
virtual score_t get_max_score(size_t idx) const = 0;
virtual const MatchParams &getMatchParams() const = 0;
static SearchIterator::UP createArrayWand(const Terms &terms, const MatchParams &matchParams, RankParams &&rankParams, bool strict);
static SearchIterator::UP createHeapWand(const Terms &terms, const MatchParams &matchParams, RankParams &&rankParams, bool strict);
static SearchIterator::UP create(const Terms &terms, const MatchParams &matchParams, RankParams &&rankParams, bool strict);
static SearchIterator::UP create(fef::TermFieldMatchData &tmd,
const MatchParams &matchParams,
const std::vector<int32_t> &weights,
const std::vector<IDocumentWeightAttribute::LookupResult> &dict_entries,
const IDocumentWeightAttribute &attr,
bool strict);
};
}
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