lbug 0.16.0

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

#include "planner/operator/logical_operator.h"

namespace lbug {
namespace planner {

struct LogicalAggregatePrintInfo final : OPPrintInfo {
    binder::expression_vector keys;
    binder::expression_vector aggregates;

    LogicalAggregatePrintInfo(binder::expression_vector keys, binder::expression_vector aggregates)
        : keys(std::move(keys)), aggregates(std::move(aggregates)) {}

    std::string toString() const override;

    std::unique_ptr<OPPrintInfo> copy() const override {
        return std::unique_ptr<LogicalAggregatePrintInfo>(new LogicalAggregatePrintInfo(*this));
    }

private:
    LogicalAggregatePrintInfo(const LogicalAggregatePrintInfo& other)
        : OPPrintInfo(other), keys(other.keys), aggregates(other.aggregates) {}
};

class LogicalAggregate final : public LogicalOperator {
    static constexpr LogicalOperatorType operatorType_ = LogicalOperatorType::AGGREGATE;

public:
    LogicalAggregate(binder::expression_vector keys, binder::expression_vector aggregates,
        std::shared_ptr<LogicalOperator> child)
        : LogicalOperator{operatorType_, std::move(child)}, keys{std::move(keys)},
          aggregates{std::move(aggregates)} {}
    LogicalAggregate(binder::expression_vector keys, binder::expression_vector dependentKeys,
        binder::expression_vector aggregates, std::shared_ptr<LogicalOperator> child,
        common::cardinality_t cardinality)
        : LogicalOperator{operatorType_, std::move(child), cardinality}, keys{std::move(keys)},
          dependentKeys{std::move(dependentKeys)}, aggregates{std::move(aggregates)} {}

    void computeFactorizedSchema() override;
    void computeFlatSchema() override;

    f_group_pos_set getGroupsPosToFlatten();

    std::string getExpressionsForPrinting() const override;

    bool hasKeys() const { return !keys.empty(); }
    binder::expression_vector getKeys() const { return keys; }
    void setKeys(binder::expression_vector expressions) { keys = std::move(expressions); }
    binder::expression_vector getDependentKeys() const { return dependentKeys; }
    void setDependentKeys(binder::expression_vector expressions) {
        dependentKeys = std::move(expressions);
    }
    binder::expression_vector getAllKeys() const {
        binder::expression_vector result;
        result.insert(result.end(), keys.begin(), keys.end());
        result.insert(result.end(), dependentKeys.begin(), dependentKeys.end());
        return result;
    }
    binder::expression_vector getAggregates() const { return aggregates; }

    std::unique_ptr<LogicalOperator> copy() override {
        return make_unique<LogicalAggregate>(keys, dependentKeys, aggregates, children[0]->copy(),
            cardinality);
    }

private:
    void insertAllExpressionsToGroupAndScope(f_group_pos groupPos);

private:
    binder::expression_vector keys;
    // A dependentKeyExpression depend on a keyExpression (e.g. a.age depends on a.ID) and will not
    // be treated as a hash key during hash aggregation.
    binder::expression_vector dependentKeys;
    binder::expression_vector aggregates;
};

} // namespace planner
} // namespace lbug