MySQL: Use shift() instead of array filter for queue item transfer

lib/dialects/mysql/connector-manager.js

@@ -60,6 +60,7 @@ module.exports = (function() {
     }
 
     enqueue.call(this, queueItem)
+    //queueItem.query.run(queueItem.sql, queueItem.client)
 
     return queueItem.query
   }
@@ -160,10 +161,9 @@ module.exports = (function() {
 
   var transferQueuedItems = function(count) {
     for(var i = 0; i < count; i++) {
-      var queueItem = this.queue[0]
+      var queueItem = this.queue.shift();
       if(queueItem) {
         enqueue.call(this, queueItem)
-        this.queue = without(this.queue, queueItem)
       }
     }
   }
@@ -210,6 +210,4 @@ module.exports = (function() {
   }
 
   return ConnectorManager
-})()
-
-
+})()
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