postgres::Row::operator[]

[SidorovichPavel]

postgres::Row::operator[] accepts a const std::string& as an argument. A more idiomatic approach would be to accept a std::string_view instead, as implemented in userver for json and e.t.

[itrofimow]

Row::operator[](const std::string&) eventually ends up in PQfnumber which expects a null-terminated string, so for now there's no way to improve the interface, unfortunately.

However, we are planning to vendor libpq at some point, and when it happens we could add a PQfnumber overload which accepts a string size.