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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "query_value.h"
#include "iindexenvironment.h"
#include "indexproperties.h"
#include "iqueryenvironment.h"
#include <vespa/searchlib/features/utils.h>
#include <vespa/document/datatype/tensor_data_type.h>
#include <vespa/eval/eval/fast_value.h>
#include <vespa/eval/eval/interpreted_function.h>
#include <vespa/eval/eval/value.h>
#include <vespa/eval/eval/value_codec.h>
#include <vespa/vespalib/locale/c.h>
#include <vespa/vespalib/util/issue.h>
#include <cerrno>
using document::TensorDataType;
using vespalib::Issue;
using vespalib::eval::DoubleValue;
using vespalib::eval::Function;
using vespalib::eval::InterpretedFunction;
using vespalib::eval::NodeTypes;
using vespalib::eval::SimpleObjectParams;
using vespalib::eval::TensorSpec;
using vespalib::eval::Value;
using vespalib::eval::ValueType;
using namespace search::fef::indexproperties;
namespace search::fef {
using ValueWrapper = AnyWrapper<Value::UP>;
InvalidValueTypeException::InvalidValueTypeException(const vespalib::string& query_key, const vespalib::string& type_str_in)
: vespalib::Exception("Invalid type '" + type_str_in + "' for query value '" + query_key + "'"),
_type_str(type_str_in)
{
}
InvalidTensorValueException::InvalidTensorValueException(const vespalib::eval::ValueType& type, const vespalib::string& expr_in)
: vespalib::Exception("Could not create tensor value of type '" + type.to_spec() + "' from the expression '" + expr_in + "'"),
_expr(expr_in)
{
}
namespace {
/**
* Convert a string to a feature value using special quoting mechanics;
* a string that can be converted directly into a feature
* (numeric value) will be converted. If the string cannot be
* converted directly, it will be hashed, after stripping the leading
* "'" if it exists.
*/
feature_t
as_feature(const vespalib::string& str)
{
char *end;
errno = 0;
double val = vespalib::locale::c::strtod(str.c_str(), &end);
if (errno != 0 || *end != '\0') { // not happy
if ( ! str.empty() && str[0] == '\'') {
val = features::util::getAsFeature(vespalib::stringref(str.substr(1)));
} else {
val = features::util::getAsFeature(vespalib::stringref(str));
}
}
return val;
}
// Create an empty tensor of the given type.
std::unique_ptr<Value>
empty_tensor(const ValueType& type)
{
const auto& factory = vespalib::eval::FastValueBuilderFactory::get();
return vespalib::eval::value_from_spec(TensorSpec(type.to_spec()), factory);
}
// Create a tensor value by evaluating a self-contained expression.
std::unique_ptr<Value>
as_tensor(const vespalib::string& expr, const ValueType& wanted_type)
{
const auto& factory = vespalib::eval::FastValueBuilderFactory::get();
auto fun = Function::parse(expr);
if (!fun->has_error() && (fun->num_params() == 0)) {
NodeTypes types = NodeTypes(*fun, {});
const ValueType & res_type = types.get_type(fun->root());
if (res_type == wanted_type) {
SimpleObjectParams params({});
InterpretedFunction ifun(factory, *fun, types);
InterpretedFunction::Context ctx(ifun);
return factory.copy(ifun.eval(ctx, params));
}
}
return {};
}
std::unique_ptr<Value>
decode_tensor_value(Property prop, const ValueType& value_type)
{
if (prop.found() && !prop.get().empty()) {
const vespalib::string& value = prop.get();
vespalib::nbostream stream(value.data(), value.size());
try {
auto tensor = vespalib::eval::decode_value(stream, vespalib::eval::FastValueBuilderFactory::get());
if (TensorDataType::isAssignableType(value_type, tensor->type())) {
return tensor;
} else {
Issue::report("Query value type is '%s' but decoded tensor type is '%s'",
value_type.to_spec().c_str(), tensor->type().to_spec().c_str());
}
} catch (const vespalib::eval::DecodeValueException& e) {
Issue::report("Query value has invalid binary format: %s", e.what());
}
}
return {};
}
}
Property
QueryValue::config_lookup(const IIndexEnvironment& env) const
{
const auto& props = env.getProperties();
auto res = props.lookup(_name); // query(foo)
if (!res.found()) {
res = props.lookup(_old_key); // $foo
}
return res;
}
Property
QueryValue::request_lookup(const IQueryEnvironment& env) const
{
const auto& props = env.getProperties();
auto res = props.lookup(_name); // query(foo)
if (!res.found()) {
res = props.lookup(_key); // foo
}
if (!res.found()) {
res = props.lookup(_old_key); // $foo
}
return res;
}
QueryValue::QueryValue()
: _key(),
_name(),
_old_key(),
_stored_value_key(),
_type(ValueType::double_type())
{
}
QueryValue::QueryValue(const vespalib::string& key, vespalib::eval::ValueType type)
: _key(key),
_name("query(" + key + ")"),
_old_key("$" + key),
_stored_value_key("query.value." + key),
_type(std::move(type))
{
}
QueryValue::~QueryValue() = default;
QueryValue
QueryValue::from_config(const vespalib::string& key, const IIndexEnvironment& env)
{
vespalib::string type_str = type::QueryFeature::lookup(env.getProperties(), key);
ValueType type = type_str.empty() ? ValueType::double_type() : ValueType::from_spec(type_str);
if (type.is_error()) {
throw InvalidValueTypeException(key, type_str);
}
return {key, std::move(type)};
}
std::unique_ptr<Value>
QueryValue::make_default_value(const IIndexEnvironment& env) const
{
Property p = config_lookup(env);
if (_type.is_double()) {
if (p.found()) {
return std::make_unique<DoubleValue>(as_feature(p.get()));
} else {
return std::make_unique<DoubleValue>(0);
}
} else {
if (p.found()) {
auto tensor = as_tensor(p.get(), _type);
if ( ! tensor) {
throw InvalidTensorValueException(_type, p.get().c_str());
}
return tensor;
} else {
return empty_tensor(_type);
}
}
}
void
QueryValue::prepare_shared_state(const fef::IQueryEnvironment& env, fef::IObjectStore& store) const
{
if (!_stored_value_key.empty() && _type.has_dimensions() && (store.get(_stored_value_key) == nullptr)) {
if (auto value = decode_tensor_value(request_lookup(env), _type)) {
store.add(_stored_value_key, std::make_unique<ValueWrapper>(std::move(value)));
}
}
}
const Value*
QueryValue::lookup_value(const fef::IObjectStore& store) const
{
if (const Anything* wrapped_value = store.get(_stored_value_key)) {
return ValueWrapper::getValue(*wrapped_value).get();
}
return nullptr;
}
double
QueryValue::lookup_number(const fef::IQueryEnvironment& env, double default_value) const
{
assert(!_type.has_dimensions());
auto p = request_lookup(env);
if (p.found()) {
return as_feature(p.get());
}
return default_value;
}
}
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