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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "attribute_weighted_set_blueprint.h"
#include <vespa/searchcommon/attribute/i_search_context.h>
#include <vespa/searchlib/common/bitvector.h>
#include <vespa/searchlib/fef/matchdatalayout.h>
#include <vespa/searchlib/query/query_term_ucs4.h>
#include <vespa/searchlib/queryeval/weighted_set_term_search.h>
#include <vespa/vespalib/objects/visit.h>
#include <vespa/vespalib/util/stringfmt.h>
#include <vespa/vespalib/stllike/hash_map.hpp>
#include <vespa/searchlib/queryeval/filter_wrapper.h>
#include <vespa/searchlib/queryeval/orsearch.h>
namespace search {
namespace {
using attribute::ISearchContext;
using attribute::IAttributeVector;
//-----------------------------------------------------------------------------
class UseAttr
{
private:
const attribute::IAttributeVector &_attr;
protected:
const attribute::IAttributeVector &attribute() const { return _attr; }
public:
explicit UseAttr(const attribute::IAttributeVector & attr)
: _attr(attr) {}
};
//-----------------------------------------------------------------------------
class UseStringEnum : public UseAttr
{
public:
using TokenT = uint32_t;
explicit UseStringEnum(const IAttributeVector & attr)
: UseAttr(attr) {}
auto mapToken(const ISearchContext &context) const {
return attribute().findFoldedEnums(context.queryTerm()->getTerm());
}
TokenT getToken(uint32_t docId) const {
return attribute().getEnum(docId);
}
};
//-----------------------------------------------------------------------------
class UseInteger : public UseAttr
{
public:
using TokenT = uint64_t;
explicit UseInteger(const IAttributeVector & attr) : UseAttr(attr) {}
std::vector<int64_t> mapToken(const ISearchContext &context) const {
std::vector<int64_t> result;
Int64Range range(context.getAsIntegerTerm());
if (range.isPoint()) {
result.push_back(range.lower());
}
return result;
}
TokenT getToken(uint32_t docId) const {
return attribute().getInt(docId);
}
};
//-----------------------------------------------------------------------------
template <typename T>
class AttributeFilter final : public queryeval::SearchIterator
{
private:
using Key = typename T::TokenT;
using Map = vespalib::hash_map<Key, int32_t, vespalib::hash<Key>, std::equal_to<Key>, vespalib::hashtable_base::and_modulator>;
using TFMD = fef::TermFieldMatchData;
TFMD &_tfmd;
T _attr;
Map _map;
int32_t _weight;
public:
AttributeFilter(fef::TermFieldMatchData &tfmd,
const IAttributeVector & attr,
const std::vector<int32_t> & weights,
const std::vector<ISearchContext*> & contexts)
: _tfmd(tfmd), _attr(attr), _map(), _weight(0)
{
for (size_t i = 0; i < contexts.size(); ++i) {
for (int64_t token : _attr.mapToken(*contexts[i])) {
_map[token] = weights[i];
}
}
}
void and_hits_into(BitVector & result,uint32_t begin_id) override {
auto end = _map.end();
result.foreach_truebit([&, end](uint32_t key) { if ( _map.find(_attr.getToken(key)) == end) { result.clearBit(key); }}, begin_id);
}
void doSeek(uint32_t docId) override {
auto pos = _map.find(_attr.getToken(docId));
if (pos != _map.end()) {
_weight = pos->second;
setDocId(docId);
}
}
void doUnpack(uint32_t docId) override {
_tfmd.reset(docId);
fef::TermFieldMatchDataPosition pos;
pos.setElementWeight(_weight);
_tfmd.appendPosition(pos);
}
void visitMembers(vespalib::ObjectVisitor &) const override {}
};
//-----------------------------------------------------------------------------
} // namespace search::<unnamed>
AttributeWeightedSetBlueprint::AttributeWeightedSetBlueprint(const queryeval::FieldSpec &field, const IAttributeVector & attr)
: queryeval::ComplexLeafBlueprint(field),
_numDocs(attr.getNumDocs()),
_estHits(0),
_weights(),
_attr(attr),
_contexts()
{
set_allow_termwise_eval(true);
}
AttributeWeightedSetBlueprint::~AttributeWeightedSetBlueprint()
{
while (!_contexts.empty()) {
delete _contexts.back();
_contexts.pop_back();
}
}
void
AttributeWeightedSetBlueprint::addToken(std::unique_ptr<ISearchContext> context, int32_t weight)
{
_estHits = std::min(_estHits + context->approximateHits(), _numDocs);
setEstimate(HitEstimate(_estHits, (_estHits == 0)));
_weights.push_back(weight);
_contexts.push_back(context.release());
}
queryeval::SearchIterator::UP
AttributeWeightedSetBlueprint::createLeafSearch(const fef::TermFieldMatchDataArray &tfmda, bool strict) const
{
assert(tfmda.size() == 1);
assert(getState().numFields() == 1);
fef::TermFieldMatchData &tfmd = *tfmda[0];
bool field_is_filter = getState().fields()[0].isFilter();
if ((tfmd.isNotNeeded() || field_is_filter) && (_contexts.size() == 1)) {
return _contexts[0]->createIterator(&tfmd, strict);
}
if (strict) { // use generic weighted set search
fef::MatchDataLayout layout;
auto handle = layout.allocTermField(tfmd.getFieldId());
auto match_data = layout.createMatchData();
auto child_tfmd = match_data->resolveTermField(handle);
std::vector<queryeval::SearchIterator*> children(_contexts.size());
for (size_t i = 0; i < _contexts.size(); ++i) {
// TODO: pass ownership with unique_ptr
children[i] = _contexts[i]->createIterator(child_tfmd, true).release();
}
return queryeval::WeightedSetTermSearch::create(children, tfmd, field_is_filter, _weights, std::move(match_data));
} else { // use attribute filter optimization
bool isString = (_attr.isStringType() && _attr.hasEnum());
assert(!_attr.hasMultiValue());
if (isString) {
return std::make_unique<AttributeFilter<UseStringEnum>>(tfmd, _attr, _weights, _contexts);
} else {
assert(_attr.isIntegerType());
return std::make_unique<AttributeFilter<UseInteger>>(tfmd, _attr, _weights, _contexts);
}
}
}
queryeval::SearchIterator::UP
AttributeWeightedSetBlueprint::createFilterSearch(bool strict, FilterConstraint) const
{
std::vector<std::unique_ptr<queryeval::SearchIterator>> children;
children.reserve(_contexts.size());
for (auto& context : _contexts) {
auto wrapper = std::make_unique<queryeval::FilterWrapper>(1);
wrapper->wrap(context->createIterator(wrapper->tfmda()[0], strict));
children.emplace_back(std::move(wrapper));
}
return queryeval::OrSearch::create(std::move(children), strict, queryeval::UnpackInfo());
}
void
AttributeWeightedSetBlueprint::fetchPostings(const queryeval::ExecuteInfo &execInfo)
{
if (execInfo.isStrict()) {
for (auto * context : _contexts) {
context->fetchPostings(execInfo);
}
}
}
void
AttributeWeightedSetBlueprint::visitMembers(vespalib::ObjectVisitor &visitor) const
{
ComplexLeafBlueprint::visitMembers(visitor);
visitor.visitString("attribute", _attr.getName());
visitor.openStruct("terms", "TermList");
for (size_t i = 0; i < _contexts.size(); ++i) {
const ISearchContext * context = _contexts[i];
visitor.openStruct(vespalib::make_string("[%zu]", i), "Term");
visitor.visitBool("valid", context->valid());
if (context-> valid()) {
bool isString = (_attr.isStringType() && _attr.hasEnum());
if (isString) {
visitor.visitString("term", context->queryTerm()->getTerm());
} else {
visitor.visitInt("term", context->getAsIntegerTerm().lower());
}
visitor.visitInt("weight", _weights[i]);
}
visitor.closeStruct();
}
visitor.closeStruct();
}
} // namespace search
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