1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
|
// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "constant_feature.h"
#include "valuefeature.h"
#include <vespa/searchlib/fef/featureexecutor.h>
#include <vespa/searchlib/fef/properties.h>
#include <vespa/eval/eval/function.h>
#include <vespa/eval/eval/value_cache/constant_value.h>
#include <vespa/vespalib/util/stash.h>
#include <vespa/log/log.h>
LOG_SETUP(".features.constant_feature");
using namespace search::fef;
using vespalib::eval::ValueType;
using vespalib::eval::Function;
using vespalib::eval::SimpleConstantValue;
namespace search::features {
/**
* Feature executor that returns a constant value.
*/
class ConstantFeatureExecutor : public fef::FeatureExecutor
{
private:
const vespalib::eval::Value &_value;
public:
ConstantFeatureExecutor(const vespalib::eval::Value &value)
: _value(value)
{}
bool isPure() override { return true; }
void execute(uint32_t) override {
outputs().set_object(0, _value);
}
static FeatureExecutor &create(const vespalib::eval::Value &value, vespalib::Stash &stash) {
return stash.create<ConstantFeatureExecutor>(value);
}
};
ConstantBlueprint::ConstantBlueprint()
: Blueprint("constant"),
_key(),
_value()
{
}
ConstantBlueprint::~ConstantBlueprint() = default;
void
ConstantBlueprint::visitDumpFeatures(const IIndexEnvironment &,
IDumpFeatureVisitor &) const
{
}
Blueprint::UP
ConstantBlueprint::createInstance() const
{
return std::make_unique<ConstantBlueprint>();
}
bool
ConstantBlueprint::setup(const IIndexEnvironment &env,
const ParameterList ¶ms)
{
_key = params[0].getValue();
_value = env.getConstantValue(_key);
if (!_value) {
auto type_prop = env.getProperties().lookup(getName(), "type");
auto value_prop = env.getProperties().lookup(getName(), "value");
if ((type_prop.size() == 1) && (value_prop.size() == 1)) {
auto type = ValueType::from_spec(type_prop.get());
auto value = Function::parse(value_prop.get())->root().get_const_value();
if (!type.is_error() && value && (value->type() == type)) {
_value = std::make_unique<SimpleConstantValue>(std::move(value));
} else {
fail("Constant '%s' has invalid spec: type='%s', value='%s'",
_key.c_str(), type_prop.get().c_str(), value_prop.get().c_str());
}
} else {
fail("Constant '%s' not found", _key.c_str());
}
} else if (_value->type().is_error()) {
fail("Constant '%s' has invalid type", _key.c_str());
}
FeatureType output_type = _value
? FeatureType::object(_value->type())
: FeatureType::number();
describeOutput("out", "The constant looked up in index environment using the given key.",
output_type);
return (_value && !_value->type().is_error());
}
FeatureExecutor &
ConstantBlueprint::createExecutor(const IQueryEnvironment &env, vespalib::Stash &stash) const
{
(void) env;
if (_value) {
return ConstantFeatureExecutor::create(_value->value(), stash);
} else {
// Note: Should not happen, setup() has already failed
return stash.create<SingleZeroValueExecutor>();
}
}
}
|
