lbug 0.16.1

An in-process property graph database management system built for query speed and scalability
Documentation 
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#include "binder/binder.h"
#include "function/table/bind_data.h"
#include "function/table/bind_input.h"
#include "function/table/standalone_call_function.h"
#include "function/table/table_function.h"
#include "graph/graph_entry_set.h"
#include "parser/parser.h"
#include "processor/execution_context.h"

using namespace lbug::common;
using namespace lbug::graph;

namespace lbug {
namespace function {

struct ProjectGraphCypherBindData final : TableFuncBindData {
    std::string graphName;
    std::string cypherQuery;

    ProjectGraphCypherBindData(std::string graphName, std::string cypherQuery)
        : graphName{std::move(graphName)}, cypherQuery{std::move(cypherQuery)} {}

    std::unique_ptr<TableFuncBindData> copy() const override {
        return std::make_unique<ProjectGraphCypherBindData>(graphName, cypherQuery);
    }
};

static offset_t tableFunc(const TableFuncInput& input, TableFuncOutput&) {
    const auto bindData = dynamic_cast_checked<ProjectGraphCypherBindData*>(input.bindData);
    auto graphEntrySet = GraphEntrySet::Get(*input.context->clientContext);
    graphEntrySet->validateGraphNotExist(bindData->graphName);
    // bind graph entry to check if input is valid or not. Ignore bind result.
    auto parsedStatements = parser::Parser::parseQuery(bindData->cypherQuery);
    DASSERT(parsedStatements.size() == 1);
    auto binder = binder::Binder(input.context->clientContext);
    binder.bind(*parsedStatements[0]);
    auto entry = std::make_unique<ParsedCypherGraphEntry>(bindData->cypherQuery);
    graphEntrySet->addGraph(bindData->graphName, std::move(entry));
    return 0;
}

static std::unique_ptr<TableFuncBindData> bindFunc(const main::ClientContext*,
    const TableFuncBindInput* input) {
    auto graphName = input->getLiteralVal<std::string>(0);
    auto cypherQuery = input->getLiteralVal<std::string>(1);
    return std::make_unique<ProjectGraphCypherBindData>(graphName, cypherQuery);
}

function_set ProjectGraphCypherFunction::getFunctionSet() {
    function_set functionSet;
    auto func = std::make_unique<TableFunction>(name,
        std::vector{LogicalTypeID::STRING, LogicalTypeID::STRING});
    func->bindFunc = bindFunc;
    func->tableFunc = tableFunc;
    func->initSharedStateFunc = TableFunction::initEmptySharedState;
    func->initLocalStateFunc = TableFunction::initEmptyLocalState;
    func->canParallelFunc = []() { return false; };
    functionSet.push_back(std::move(func));
    return functionSet;
}

} // namespace function
} // namespace lbug