select
 1 a,
 2 b,
 3 c,
 'string' s,
 now() now,
 '{"k": "v", "k2": 2, "k3": true, "k4": null}'::json json_obj,
 '{"k": "v", "k2": 2, "k3": true, "k4": null}'::jsonb jsonb_obj,
 '[1,2,3,3,null,"str"]'::json json_arr,
 '[1,2,3,3,null,"str"]'::jsonb jsonb_arr