\set hexagon '\'880326b885fffff\''
\set neighbor '\'880326b887fffff\''
\set pentagon '\'831c00fffffffff\''
\set uniedge 'h3_get_h3_unidirectional_edge(:hexagon, :neighbor)'
SELECT :uniedge;
 h3_get_h3_unidirectional_edge 
-------------------------------
 1180326b885fffff
(1 row)

SELECT h3_h3_indexes_are_neighbors(:hexagon, :neighbor), TRUE expected;
 h3_h3_indexes_are_neighbors | expected 
-----------------------------+----------
 t                           | t
(1 row)

SELECT h3_h3_indexes_are_neighbors(:hexagon, :hexagon), FALSE expected;
 h3_h3_indexes_are_neighbors | expected 
-----------------------------+----------
 f                           | f
(1 row)

SELECT h3_h3_unidirectional_edge_is_valid(:uniedge), TRUE expected;
 h3_h3_unidirectional_edge_is_valid | expected 
------------------------------------+----------
 t                                  | t
(1 row)

SELECT h3_h3_unidirectional_edge_is_valid(:hexagon), FALSE expected;
 h3_h3_unidirectional_edge_is_valid | expected 
------------------------------------+----------
 f                                  | f
(1 row)

SELECT
	h3_get_origin_h3_index_from_unidirectional_edge(:uniedge),
	:hexagon expected;
 h3_get_origin_h3_index_from_unidirectional_edge |    expected     
-------------------------------------------------+-----------------
 880326b885fffff                                 | 880326b885fffff
(1 row)

SELECT
	h3_get_destination_h3_index_from_unidirectional_edge(:uniedge),
	:neighbor expected;
 h3_get_destination_h3_index_from_unidirectional_edge |    expected     
------------------------------------------------------+-----------------
 880326b887fffff                                      | 880326b887fffff
(1 row)

SELECT
	h3_get_h3_indexes_from_unidirectional_edge(:uniedge),
	(:hexagon, :neighbor) expected;
 h3_get_h3_indexes_from_unidirectional_edge |             expected              
--------------------------------------------+-----------------------------------
 (880326b885fffff,880326b887fffff)          | (880326b885fffff,880326b887fffff)
(1 row)

SELECT array_length(array_agg(edge), 1), 6 expected FROM (
	SELECT h3_get_h3_unidirectional_edges_from_hexagon(:hexagon) edge
) q;
 array_length | expected 
--------------+----------
            6 |        6
(1 row)

SELECT array_length(array_agg(edge), 1), 5 expected FROM (
	SELECT h3_get_h3_unidirectional_edges_from_hexagon(:pentagon) edge
) q;
 array_length | expected 
--------------+----------
            5 |        5
(1 row)

SELECT h3_get_origin_h3_index_from_unidirectional_edge(h3_get_h3_unidirectional_edges_from_hexagon(:hexagon)),
	h3_get_destination_h3_index_from_unidirectional_edge(h3_get_h3_unidirectional_edges_from_hexagon(:hexagon));
 h3_get_origin_h3_index_from_unidirectional_edge | h3_get_destination_h3_index_from_unidirectional_edge 
-------------------------------------------------+------------------------------------------------------
 880326b885fffff                                 | 880326b887fffff
 880326b885fffff                                 | 880326b8a9fffff
 880326b885fffff                                 | 880326b8abfffff
 880326b885fffff                                 | 880326b88dfffff
 880326b885fffff                                 | 880326b881fffff
 880326b885fffff                                 | 880326b8e3fffff
(6 rows)

SELECT h3_get_unidirectional_edge_boundary(:uniedge);
                    h3_get_unidirectional_edge_boundary                    
---------------------------------------------------------------------------
 ((89.5830164946548,64.7146398954916),(89.5790678021742,64.2872231517217))
(1 row)