Currently executing queries like: 

```
SELECT * FROM system.tables LIMIT 10;\G 
SELECT * FROM system.tables LIMIT 10\G;
```

Ends up with a syntax error.

From the documentation, it should not be an error:

> You can specify \G instead of or after the semicolon.


std::string prev_port_arg;
    for (int arg_num = 1; arg_num < argc; ++arg_num)
    {
        std::string_view arg = argv[arg_num];
        if (arg == "--external")
        {
            in_external_group = true;
            external_tables_arguments.emplace_back(Arguments{""}
        }
        /// Options with value after equal sign.
        else if (
            in_external_group
            && (arg.starts_with("--file=") || arg.starts_with("--name=") || arg.starts_with("--format=") || arg.starts_with("--structure=")
                || arg.starts_with("--types=")))
        {
            external_tables_arguments.back().emplace_back(arg
        }
        /// Options with value after whitespace.
         == "--file" || arg == "--name" || arg == "--format" || arg == "--structure" || arg == "--types"))
        {
            if (arg_num + 1 < argc)
            {
                external_tables_arguments.back().emplace_back(arg
                ++a
                arg = argv[arg_num];
                external_tables_arguments.back().emplace_back(arg
            }
            else
                break;
        }