z SELECT tupleElement(t1, \'z\', \'z\') FROM t_tuple_element_default 0 SELECT tupleElement(t1, \'z\', 0) FROM t_tuple_element_default z SELECT tupleElement(t2, \'z\', \'z\') FROM t_tuple_element_default [(3,4)] SELECT tupleElement([(1, 2)], \'a\', [(3, 4)]) [[1,2,3]] SELECT tupleElement([[tuple(1)]], \'a\', [[1, 2, 3]]) SELECT tupleElement(t1, \'a\', [tuple(1)]) FROM t_tuple_element_default [(0)] SELECT tupleElement(t1, \'a\', [tuple(0)]) FROM t_tuple_element_default [(0)] SELECT tupleElement(t1, \'a\', [tuple(0)]) FROM t_tuple_element_default