Top per group: Take(1) works but FirstOrDefault() doesn't?

Question

I\'m using EF 4.3.1... just upgraded to 4.4 (problem remains) with database-first POCO entities generated by the EF 4.x DbContext Generator. I have the following

Answer 1

Today I just find out that q.OrderBy(a=>a.Customer.FirstOrDefault().Name) will not hit database if FirstOrDefault() is inside Sorting Clause.