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/* postgres can not */
/* syntax version 1 */
select ListFlatten(null),ListFlatten([]),
ListFlatten(Just([])),ListFlatten(Nothing(EmptyList?)),
ListFlatten([[],[]]),ListFlatten([null,null]),
ListFlatten([Just([]),Just([])]),
ListFlatten(Just([[],[]])),ListFlatten(Just([null,null])),
ListFlatten(Just([Just([]),Just([])]));
select ListFlatten([[1,2],[3,4]]),
ListFlatten([[1,2],null,[3,4]]),
ListFlatten(Just([[1,2],[3,4]])),
ListFlatten(Just([[1,2],null,[3,4]])),
ListFlatten([Just([1,2]),Just([3,4])]),
ListFlatten(Just([Just([1,2]),Just([3,4])]));
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