Incorrect SQL generated for queries involving more than one 
AbstractSchemaNames, generated SQL FROM clause is missing 'Table alias'

                 Key: OPENJPA-25
             Project: OpenJPA
          Issue Type: Bug
          Components: query
            Reporter: Catalina Wei

select e, d from EmpBean e, DeptBean d generates following SQL where t2 is 
          SELECT t1.empid, t2.deptno FROM EmpBean t0 JOIN EmpBean t1 ON (1 = 1)
 'DeptBean t2' is missing in the FROM clause.
Similar problem occurs to the following query:
  select d from EmpBean e left join e.dept d, ProjectBean p where e.salary = 
p.budget ==> incorrect SQL (t3 is undefined): 
SELECT t1.deptno, t1.budget, t1.mgr_empid,, t1.reportsTo_deptno FROM 
EmpBean t0 LEFT OUTER JOIN DeptBean t1 ON t0.dept_deptno = t1.deptno JOIN 
EmpBean t2 ON (1 = 1) WHERE (t2.salary = t3.budget) 

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