title: What's happening in queryset converting to list
body: <p>I have some problem in using methods in mongoengine,just as follows (just show the key codes ):</p>
  
  <pre><code> from mongoengine import *
  
   class AB(Document):
        ........
  
   queryset=AB.objects(__raw__=rawquery)
   num1=queryset.count()
   querylist=list(queryset)
   num2=len(querylist)
  </code></pre>
  
  <p>The problem is that in my project num1=111 ,however num2=55 </p>
  
  <p>my question is why num1 &lt; num2 ?</p>
  
  <p>what is happening in the code <code>"querylist=list(queryset)"</code>?</p>
  
  <p>thank u!</p>