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docset_iterators_scorers.cpp
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docset_iterators_scorers.cpp
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#include "docset_iterators.h"
#include "similarity.h"
#include "queryexec_ctx.h"
using namespace Trinity;
using namespace Trinity::DocsSetIterators;
static IteratorScorer *default_wrapper(queryexec_ctx *const rctx, DocsSetIterators::Iterator *const it) {
switch (it->type) {
case DocsSetIterators::Type::PostingsListIterator: {
struct Wrapper final
: public IteratorScorer {
Similarity::IndexSourceTermsScorer *const scorer;
Similarity::ScorerWeight * weight;
Wrapper(Iterator *const it, queryexec_ctx *const rctx)
: IteratorScorer{it}, scorer{rctx->scorer} {
const auto termID = static_cast<Codecs::PostingsListIterator *>(it)->decoder()->execCtxTermID;
const auto term = rctx->tctxMap[termID].second;
weight = scorer->new_scorer_weight(&term, 1);
}
~Wrapper() {
delete weight;
}
inline double iterator_score() override final {
const auto i = static_cast<const Codecs::PostingsListIterator *>(it);
return scorer->score(i->current(), i->freq, weight);
}
};
return new Wrapper(it, rctx);
} break;
case DocsSetIterators::Type::DisjunctionSome: {
struct Wrapper final
: public IteratorScorer {
Wrapper(Iterator *const it)
: IteratorScorer{it} {
}
double iterator_score() override final {
double sum{0};
auto i = static_cast<DisjunctionSome *>(it);
i->update_matched_cnt();
for (auto l{i->lead}; l; l = l->next)
sum += static_cast<IteratorScorer *>(l->it->rdp)->iterator_score();
return sum;
}
};
return new Wrapper(it);
}
case DocsSetIterators::Type::Filter: {
struct Wrapper final
: public IteratorScorer {
Wrapper(Iterator *it)
: IteratorScorer{it} {
}
// TODO: for when we support this
// inline auto iterator() override final { return static_cast<Filter *>(it)->req; }
double iterator_score() override final {
return static_cast<IteratorScorer *>(static_cast<Filter *>(it)->req->rdp)->iterator_score();
}
};
return new Wrapper(it);
}
case DocsSetIterators::Type::Optional: {
struct Wrapper final
: public IteratorScorer {
Wrapper(Iterator *it)
: IteratorScorer{it} {
}
// TODO: for when we support it
// inline auto iterator() override final { return statc_cast<Optional *>(it)->main; }
double iterator_score() override final {
auto it = static_cast<Optional *>(this->it);
auto main{it->main};
auto opt{it->opt};
auto score = static_cast<IteratorScorer *>(main->rdp)->iterator_score();
const auto id = main->current();
auto optId = opt->current();
if (optId < id)
optId = opt->advance(id);
if (optId == id)
score += static_cast<IteratorScorer *>(opt->rdp)->iterator_score();
return score;
}
};
return new Wrapper(it);
}
case DocsSetIterators::Type::DisjunctionAllPLI: {
struct Wrapper final
: public IteratorScorer {
Wrapper(Iterator *it)
: IteratorScorer{it} {
}
double iterator_score() override final {
double sum{0};
static_cast<DisjunctionAllPLI *>(it)->pq.for_each_top([&sum](const auto it) { sum += static_cast<IteratorScorer *>(it->rdp)->iterator_score(); },
[](const auto a, const auto b) noexcept {
return a->current() == b->current();
});
return sum;
}
};
return new Wrapper(it);
}
case DocsSetIterators::Type::Disjunction: {
struct Wrapper final
: public IteratorScorer {
Wrapper(Iterator *it)
: IteratorScorer{it} {
}
double iterator_score() override final {
double sum{0};
static_cast<Disjunction *>(it)->pq.for_each_top([&sum](const auto it) { sum += static_cast<IteratorScorer *>(it->rdp)->iterator_score(); },
[](const auto a, const auto b) noexcept {
return a->current() == b->current();
});
return sum;
}
};
return new Wrapper(it);
}
case DocsSetIterators::Type::ConjuctionAllPLI: {
struct Wrapper final
: public IteratorScorer {
Wrapper(Iterator *it)
: IteratorScorer{it} {
}
double iterator_score() override final {
double res{0};
auto it = static_cast<ConjuctionAllPLI *>(this->it);
const auto size{it->size};
const auto its{it->its};
for (uint16_t i{0}; i != size; ++i)
res += static_cast<IteratorScorer *>(its[i]->rdp)->iterator_score();
return res;
}
};
return new Wrapper(it);
}
case DocsSetIterators::Type::Conjuction: {
struct Wrapper final
: public IteratorScorer {
Wrapper(Iterator *it)
: IteratorScorer{it} {
}
double iterator_score() override final {
double res{0};
auto it = static_cast<Conjuction *>(this->it);
const auto size{it->size};
const auto its{it->its};
for (uint16_t i{0}; i != size; ++i)
res += static_cast<IteratorScorer *>(its[i]->rdp)->iterator_score();
return res;
}
};
return new Wrapper(it);
}
case DocsSetIterators::Type::Phrase: {
struct Wrapper final
: public IteratorScorer {
Similarity::IndexSourceTermsScorer *const scorer;
Similarity::ScorerWeight * weight;
Wrapper(Iterator *it, queryexec_ctx *const rctx)
: IteratorScorer{it}, scorer{rctx->scorer} {
auto p = static_cast<DocsSetIterators::Phrase *>(it);
str8_t terms[p->size];
for (uint32_t i{0}; i != p->size; ++i) {
const auto termID = static_cast<const Codecs::PostingsListIterator *>(p->its[i])->decoder()->execCtxTermID;
const auto term = rctx->tctxMap[termID].second;
terms[i] = term;
}
weight = scorer->new_scorer_weight(terms, p->size);
}
~Wrapper() {
delete weight;
}
inline double iterator_score() override final {
const auto it = static_cast<const Phrase *>(this->it);
return scorer->score(it->current(), it->matchCnt, weight);
}
};
return new Wrapper(it, rctx);
}
case DocsSetIterators::Type::VectorIDs:
case DocsSetIterators::Type::Dummy:
case DocsSetIterators::Type::AppIterator:
return nullptr;
}
return nullptr;
}
DocsSetIterators::Iterator *DocsSetIterators::wrap_iterator(queryexec_ctx *const rctx, DocsSetIterators::Iterator *it) {
it->rdp = default_wrapper(rctx, it);
return it;
}