lbug 0.16.1

An in-process property graph database management system built for query speed and scalability
Documentation 
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

#pragma once

#include "binder/expression/expression.h"
#include "expression_evaluator.h"

namespace lbug {
namespace evaluator {

class PatternExpressionEvaluator : public ExpressionEvaluator {
    static constexpr EvaluatorType type_ = EvaluatorType::NODE_REL;

public:
    PatternExpressionEvaluator(std::shared_ptr<binder::Expression> pattern,
        evaluator_vector_t children)
        : ExpressionEvaluator{type_, std::move(pattern), std::move(children)}, idVector{nullptr} {}

    void evaluate() override;

    bool selectInternal(common::SelectionVector&) override { UNREACHABLE_CODE; }

    std::unique_ptr<ExpressionEvaluator> copy() override {
        return std::make_unique<PatternExpressionEvaluator>(expression, copyVector(children));
    }

protected:
    void resolveResultVector(const processor::ResultSet& resultSet,
        storage::MemoryManager* memoryManager) override;

    virtual void initFurther(const processor::ResultSet& resultSet);

protected:
    common::ValueVector* idVector;
    std::vector<std::shared_ptr<common::ValueVector>> parameters;
};

class UndirectedRelExpressionEvaluator final : public PatternExpressionEvaluator {
public:
    UndirectedRelExpressionEvaluator(std::shared_ptr<binder::Expression> pattern,
        evaluator_vector_t children, std::unique_ptr<ExpressionEvaluator> directionEvaluator)
        : PatternExpressionEvaluator{std::move(pattern), std::move(children)}, srcIDVector{nullptr},
          dstIDVector{nullptr}, directionVector{nullptr},
          directionEvaluator{std::move(directionEvaluator)} {}

    void evaluate() override;

    void initFurther(const processor::ResultSet& resultSet) override;

    std::unique_ptr<ExpressionEvaluator> copy() override {
        return std::make_unique<UndirectedRelExpressionEvaluator>(expression, copyVector(children),
            directionEvaluator->copy());
    }

private:
    common::ValueVector* srcIDVector;
    common::ValueVector* dstIDVector;
    common::ValueVector* directionVector;
    std::unique_ptr<ExpressionEvaluator> directionEvaluator;
};

} // namespace evaluator
} // namespace lbug