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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "multi_term_or_filter_search.h"
#include "posting_iterator_pack.h"
#include <vespa/searchlib/fef/matchdata.h>
#include <vespa/searchlib/queryeval/iterator_pack.h>
#include <vespa/searchlib/common/bitvector.h>
#include <vespa/searchlib/queryeval/emptysearch.h>
using search::queryeval::SearchIteratorPack;
namespace search::attribute {
template<typename IteratorPack>
class MultiTermOrFilterSearchImpl : public MultiTermOrFilterSearch
{
// Vector that caches the docids of the current positions of the iterators in the pack.
// This reduces cache misses in doSeek() and seek_all().
std::vector<uint32_t> _docids;
IteratorPack _children;
fef::TermFieldMatchData* _tfmd;
void seek_all(uint32_t docId);
public:
explicit MultiTermOrFilterSearchImpl(IteratorPack&& children, fef::TermFieldMatchData* tfmd);
~MultiTermOrFilterSearchImpl() override;
void doSeek(uint32_t docId) override;
void doUnpack(uint32_t docid) override {
if (_tfmd != nullptr) {
_tfmd->resetOnlyDocId(docid);
}
}
void initRange(uint32_t begin, uint32_t end) override {
SearchIterator::initRange(begin, end);
_children.initRange(begin, end);
for (uint16_t i = 0; i < _children.size(); ++i) {
_docids[i] = _children.get_docid(i);
}
}
void or_hits_into(BitVector &result, uint32_t begin_id) override {
return _children.or_hits_into(result, begin_id);
}
void and_hits_into(BitVector &result, uint32_t begin_id) override {
return result.andWith(*get_hits(begin_id));
}
std::unique_ptr<BitVector> get_hits(uint32_t begin_id) override {
seek_all(getDocId());
return _children.get_hits(begin_id, getEndId());
}
Trinary is_strict() const override { return Trinary::True; }
};
template<typename IteratorPack>
MultiTermOrFilterSearchImpl<IteratorPack>::MultiTermOrFilterSearchImpl(IteratorPack&& children, fef::TermFieldMatchData* tfmd)
: MultiTermOrFilterSearch(),
_docids(children.size(), 0),
_children(std::move(children)),
_tfmd(tfmd)
{
}
template<typename IteratorPack>
MultiTermOrFilterSearchImpl<IteratorPack>::~MultiTermOrFilterSearchImpl() = default;
template<typename IteratorPack>
void
MultiTermOrFilterSearchImpl<IteratorPack>::seek_all(uint32_t docId) {
for (uint16_t i = 0; i < _children.size(); ++i) {
uint32_t next = _docids[i];
if (next < docId) {
next = _children.seek(i, docId);
_docids[i] = next;
}
}
}
template<typename IteratorPack>
void
MultiTermOrFilterSearchImpl<IteratorPack>::doSeek(uint32_t docId)
{
uint32_t min_doc_id = endDocId;
for (uint16_t i = 0; i < _children.size(); ++i) {
uint32_t next = _docids[i];
if (next < docId) {
next = _children.seek(i, docId);
_docids[i] = next;
}
if (next == docId) {
setDocId(next);
return;
}
min_doc_id = std::min(min_doc_id, next);
}
setDocId(min_doc_id);
}
namespace {
template <typename IteratorType, typename IteratorPackType>
std::unique_ptr<queryeval::SearchIterator>
create_helper(std::vector<IteratorType>&& children, fef::TermFieldMatchData* tfmd)
{
if (children.empty()) {
return std::make_unique<queryeval::EmptySearch>();
} else {
std::sort(children.begin(), children.end(),
[](const auto & a, const auto & b) { return a.size() > b.size(); });
using OrFilter = MultiTermOrFilterSearchImpl<IteratorPackType>;
return std::make_unique<OrFilter>(IteratorPackType(std::move(children)), tfmd);
}
}
}
std::unique_ptr<queryeval::SearchIterator>
MultiTermOrFilterSearch::create(std::vector<DocidIterator>&& children)
{
return create_helper<DocidIterator, DocidIteratorPack>(std::move(children), nullptr);
}
std::unique_ptr<queryeval::SearchIterator>
MultiTermOrFilterSearch::create(std::vector<DocidIterator>&& children, fef::TermFieldMatchData& tfmd)
{
return create_helper<DocidIterator, DocidIteratorPack>(std::move(children), &tfmd);
}
std::unique_ptr<queryeval::SearchIterator>
MultiTermOrFilterSearch::create(std::vector<DocidWithWeightIterator>&& children)
{
return create_helper<DocidWithWeightIterator, DocidWithWeightIteratorPack>(std::move(children), nullptr);
}
std::unique_ptr<queryeval::SearchIterator>
MultiTermOrFilterSearch::create(std::vector<DocidWithWeightIterator>&& children, fef::TermFieldMatchData& tfmd)
{
return create_helper<DocidWithWeightIterator, DocidWithWeightIteratorPack>(std::move(children), &tfmd);
}
std::unique_ptr<queryeval::SearchIterator>
MultiTermOrFilterSearch::create(const std::vector<SearchIterator *>& children,
std::unique_ptr<fef::MatchData> md)
{
if (children.empty()) {
return std::make_unique<queryeval::EmptySearch>();
} else {
using OrFilter = MultiTermOrFilterSearchImpl<SearchIteratorPack>;
return std::make_unique<OrFilter>(SearchIteratorPack(children, std::move(md)), nullptr);
}
}
}
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