title: How to manufacture Django ORM QueySet from existing data / get back to ORM queries from plain SQL?
body: <p>My case:
  In one place of my Django app I decided to use plain SQL, for optimization purpose - I was need a complex join, and Django ORM does not capable do such job. But use of plain SQL caused another problem - this function preferably should return a QuerySet object, and it is become impossible.</p>
  
  <p>And so Im wonder - is there any approaches for constructing QuerySets manually?</p>