Function append

src/Common/parseRemoteDescription.cpp:17–36

The Cartesian product of two sets of rows, the result is written in place of the first argument

/// The Cartesian product of two sets of rows, the result is written in place of the first argument
static void append(std::vector<String> & to, const std::vector<String> & what, size_t max_addresses)
{
    if (what.empty())
        return;

    if (to.empty())
    {
        to = what;
        return;
    }

    if (what.size() * to.size() > max_addresses)
        throw Exception(ErrorCodes::BAD_ARGUMENTS, "Table function 'remote': first argument generates too many result addresses");
    std::vector<String> res;
    for (const auto & elem_to : to)
        for (const auto & elem_what : what)
            res.push_back(elem_to + elem_what);

    to.swap(res);
}


/// Parse number from substring