[WIP] Try moving get_from_clause() to later.

[schinckel]

I have two seperate apps that add different functionality related to the ORM, that are both hitting problems because by the time the SQL for the WHERE clause is generated, the FROM clause is all done.

I wonder if anyone knows if there is a reason this is the case?

This PR is a test to see if there are any weird failures that are triggered by moving these bits around.