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\pset tuples_only on
-- neighbouring indexes (one hexagon, one pentagon) at resolution 3
\set geo POINT(-144.52399108028, 49.7165031828995)
\set hexagon '\'831c02fffffffff\'::h3index'
\set pentagon '\'831c00fffffffff\'::h3index'
\set edgecross '\'8003fffffffffff\'::h3index'
\set resolution 3
--
-- TEST h3_cell_to_latlng and h3_latlng_to_cell
--
-- convertion to geo works
SELECT h3_cell_to_latlng(:hexagon) ~= :geo;
-- convertion to h3 index works
SELECT h3_latlng_to_cell(:geo, :resolution) = :hexagon;
-- h3_cell_to_latlng is inverse of h3_latlng_to_cell
SELECT h3_cell_to_latlng(i) ~= :geo AND h3_get_resolution(i) = :resolution FROM (
SELECT h3_latlng_to_cell(:geo, :resolution) AS i
) AS q;
-- h3_latlng_to_cell is inverse of h3_cell_to_latlng
SELECT h3_latlng_to_cell(g, r) = :hexagon FROM (
SELECT h3_cell_to_latlng(:hexagon) AS g, h3_get_resolution(:hexagon) AS r
) AS q;
-- same for pentagon
SELECT h3_latlng_to_cell(g, r) = :pentagon FROM (
SELECT h3_cell_to_latlng(:pentagon) AS g, h3_get_resolution(:pentagon) AS r
) AS q;
--
-- TEST h3_cell_to_boundary
--
-- polyfill of geo boundary returns original index
SELECT h3_polygon_to_cells(h3_cell_to_boundary(:hexagon), null, :resolution) = :hexagon;
-- same for pentagon
SELECT h3_polygon_to_cells(h3_cell_to_boundary(:pentagon), null, :resolution) = :pentagon;
-- the boundary of an edgecrossing index is different with flag set to true
SELECT h3_cell_to_boundary(:hexagon) ~= h3_cell_to_boundary(:hexagon, true)
AND NOT h3_cell_to_boundary(:edgecross) ~= h3_cell_to_boundary(:edgecross, true);
-- cell to parent RES_MISMATCH
CREATE FUNCTION h3_fail_indexing_cell_to_parent() RETURNS boolean LANGUAGE PLPGSQL
AS $$
BEGIN
PERFORM h3_cell_to_parent('831c02fffffffff', 10);
RETURN false;
EXCEPTION WHEN OTHERS THEN
RETURN true;
END;
$$;
SELECT h3_fail_indexing_cell_to_parent();
DROP FUNCTION h3_fail_indexing_cell_to_parent;
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