Problem using two different database

I was able to mount a query and return an array, but it does not show me the name of the columns (key)...

PHP Code:

$data['test'] = $this->md_test->buscaPedidoAtual($dt);
$row = $data['test']->result_array();

echo '<pre>';
var_dump($row);
echo '</pre>'; 


Result:

Code:

array(49) {
 ["100"]=>
 string(3) "100"
 ["1"]=>
 string(1) "1"
 ["0131826"]=>
 string(7) "0131826"
 ...
 ...
...
...