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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "matchcountfeature.h"
#include "utils.h"
#include "valuefeature.h"
#include <vespa/vespalib/util/stash.h>
using namespace search::fef;
namespace search::features {
namespace {
/**
* Implements the executor for the matchCount feature for index and
* attribute fields.
*/
class MatchCountExecutor : public fef::FeatureExecutor {
private:
std::vector<fef::TermFieldHandle> _handles;
const fef::MatchData *_md;
void handle_bind_match_data(const fef::MatchData &md) override {
_md = &md;
}
public:
MatchCountExecutor(uint32_t fieldId, const fef::IQueryEnvironment &env);
void execute(uint32_t docId) override;
};
MatchCountExecutor::MatchCountExecutor(uint32_t fieldId, const IQueryEnvironment &env)
: FeatureExecutor(),
_handles(),
_md(nullptr)
{
for (uint32_t i = 0; i < env.getNumTerms(); ++i) {
TermFieldHandle handle = util::getTermFieldHandle(env, i, fieldId);
if (handle != IllegalHandle) {
_handles.push_back(handle);
}
}
}
void
MatchCountExecutor::execute(uint32_t docId) {
size_t output = 0;
for (uint32_t i = 0; i < _handles.size(); ++i) {
const TermFieldMatchData *tfmd = _md->resolveTermField(_handles[i]);
if (tfmd->getDocId() == docId) {
output++;
}
}
outputs().set_number(0, static_cast<feature_t>(output));
}
}
MatchCountBlueprint::MatchCountBlueprint() :
Blueprint("matchCount"),
_field(nullptr)
{
}
void
MatchCountBlueprint::visitDumpFeatures(const IIndexEnvironment &, IDumpFeatureVisitor &) const
{
}
bool
MatchCountBlueprint::setup(const IIndexEnvironment &, const ParameterList & params)
{
_field = params[0].asField();
describeOutput("out", "Returns number of matches in the field of all terms in the query");
return true;
}
Blueprint::UP
MatchCountBlueprint::createInstance() const
{
return std::make_unique<MatchCountBlueprint>();
}
FeatureExecutor &
MatchCountBlueprint::createExecutor(const IQueryEnvironment & queryEnv, vespalib::Stash &stash) const
{
if (_field == nullptr) {
return stash.create<SingleZeroValueExecutor>();
}
return stash.create<MatchCountExecutor>(_field->id(), queryEnv);
}
}
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