[1,NULL,2]	1
[1,NULL,2]	\N
[1,NULL,2]	2
[(1,2),(3,4),(5,6)]	(1,2)
[(1,2),(3,4),(5,6)]	(3,4)
[(1,2),(3,4),(5,6)]	(5,6)
['Hello','world']	Hello
['Hello','world']	world