presto-base-jdbc/src/main/java/io/prestosql/plugin/jdbc/DriverConnectionFactory.java/DriverConnectionFactory/openConnection
class DriverConnectionFactory:    @Override
    public Connection openConnection(JdbcIdentity identity)
            throws SQLException
    {
        Properties properties = getCredentialProperties(identity);
        Connection connection = driver.connect(connectionUrl, properties);
        checkState(connection != null, "Driver returned null connection");
        return connection;
    }