private function selectAddress($key)
{
// Select the user type
$query = "SELECT value FROM {$this->tableNamePrefix} WHERE key=?";
$statement = new SimpleStatement($query);
$options = new ExecutionOptions(array("arguments" => array($key)));
$rows = $this->session->execute($statement, $options);
// Ensure the user type is valid
$this->assertCount(1, $rows);
$row = $rows->first();
$this->assertNotNull($row);
$this->assertArrayHasKey("value", $row);
$userType = $row["value"];
$this->assertInstanceOf('Cassandra\\UserTypeValue', $userType);
// Return the user type
return $userType;
}