Description:
------------
I've attached a patch that adds support for the fetch table name attribute to the PDO MySQL driver. This could be very helpful when building multiple data objects off subsets of the same query (i.e., one per table).

Reproduce code:
---------------
<?php

  $db = new PDO('mysql:host=localhost;dbname=test', 'root', '');
  $db->setAttribute(PDO::ATTR_FETCH_TABLE_NAMES, 1);

  $rows = $db->query('SELECT * FROM test LIMIT 1')->fetchAll(PDO::FETCH_ASSOC);
  var_dump($rows);

?>

Patch is available from: http://dothedrew.net/misc/pdo_mysql-fetch_tables.patch

Expected result:
----------------
array(1) {
  [0]=>
  array(2) {
    ["test.name"]=>
    string(6) "Andrew"
    ["test.id"]=>
    string(1) "1"
  }
}


Actual result:
--------------
array(1) {
  [0]=>
  array(2) {
    ["name"]=>
    string(6) "Andrew"
    ["id"]=>
    string(1) "1"
  }
}