About INTERSECTION ALL AND EXCEPT ALL

[jz...@cornell.edu]

Greetings, when I read through the django source code, I see the union and union all method is implemented. However, if I remember it right, in PostgreSQL, intersection and difference are also have the all method (which means the result will contains duplicates).

Here is the documentation of the PostgreSQL:

   https://www.postgresql.org/docs/9.6/static/queries-union.html

So I would like to create a pull request to introduce that feature if you like.

How do you think about that?