Kuzu LIST to c++ std::vector

[dlawnsgh95]

i want to convert result of query RETURN CAST("[1,2]" AS UINT16[])" into std::vectot<uint16_t> in c++.
is there any way to do this in c++ api?

[acquamarin]

Hi @dlawnsgh95
To parse nested types in QueryResultSet, you can utilize the NestedVal class.

A simple example would be:

#include <iostream>

#include "kuzu.hpp"
using namespace kuzu::main;

int main() {
    auto database = std::make_unique<Database>("" /* fill db path */);
    auto connection = std::make_unique<Connection>(database.get());
    auto queryResult = connection->query("RETURN CAST(\"[1,2]\" AS UINT16[])");
    std::vector<uint16_t> result;
    auto resultTuple = queryResult->getNext()->getValue(0);
    auto numElements = kuzu::common::NestedVal::getChildrenSize(resultTuple);
    for (auto i = 0u; i < numElements; i++) {
        result.push_back(
            kuzu::common::NestedVal::getChildVal(resultTuple, i)->getValue<uint16_t>());
    }

    for (auto& element : result) {
        std::cout << element << std::endl;
    }
}