F-expressions used with iexact lookup produces invalid SQL

[Łukasz Rekucki]

Example queries generated from Employee.objects.filter(firstname__iexact=F('lastname')):

-- 1. PostgreSQL

SELECT "expressions_employee"."id", "expressions_employee"."firstname", "expressions_employee"."lastname" 
FROM "expressions_employee" WHERE UPPER("expressions_employee"."firstname"::text) = UPPER() "expressions_employee"."lastname"
-- DatabaseError: syntax error at or near ""expressions_employee""
-- LINE 1: ...xpressions_employee"."firstname"::text) = UPPER() "expressio...

-- 2. SQLite

SELECT "expressions_employee"."id", "expressions_employee"."firstname", "expressions_employee"."lastname" 
FROM "expressions_employee" WHERE "expressions_employee"."firstname" LIKE  ESCAPE '\' "expressions_employee"."lastname"
-- DatabaseError: near "ESCAPE": syntax error

I found the error on Django 1.2. Reproduced on trunk (see attachment)

[Łukasz Rekucki]

Test case to reproduce the error.

[Aymeric Augustin]

I could reproduce the error with that test case.

It seems to me that #11722 reported the same problem.