framework/resources/Functional/joins/nulleqjoin/neqjn_union.q

SELECT t1.col_int 
FROM typeall_l t1, typeall_r t2
WHERE t1.col_int = t2.col_int OR ( t1.col_int IS NULL AND t2.col_int IS NULL )
UNION
SELECT t2.col_int
FROM typeall_l t1, typeall_r t2
WHERE t1.col_int = t2.col_int OR ( t1.col_int IS NULL AND t2.col_int IS NULL );