Hibernate INNER join doesn't work..SQL Query Works...Weird Behavior

Query Returns zero records in HQL (Query 1 = Query 2 + Query 3):

Two OR conditions..Instead of returning results, it returns zero records

from Employee as emp where empState = 'ACTIVE' and exists (from EmployeeOrg as 
EmployeeOrg where 52 = 52 and ((EmployeeOrg.empDetailTable is null and 
EmployeeOrg.empId like '10002') or (EmployeeOrg.empDetailTable is not null and 
EmployeeOrg.empDetailTable.empId like '10002')));

Query2 Returns Records in HQL:

from Employee as emp where empState = 'ACTIVE' and exists (from EmployeeOrg 
as EmployeeOrg where 52 = 52 and ((EmployeeOrg.empDetailTable is null and 
EmployeeOrg.empId like '10002')));

Query3 Returns Zero Records in HQL

from Employee as emp where empState = 'ACTIVE' and exists (from EmployeeOrg 
as EmployeeOrg where 52 = 52 and (EmployeeOrg.empDetailTable is not null and 
EmployeeOrg.empDetailTable.empId like '10002'));

When we combine the condition - Query 1 results zero records

I suspect it is a hibernate bug or a default behaviour or query needs to be corrected.

Basically the OR and And condition doesn't work properly during joining multiple tables.

Thanks.