SELECT '#2427', st_astext(st_pointn(ST_CurveToLine('CIRCULARSTRING(-1 0,0 1,0 -1)'),1));
+SELECT '#2168', ST_Distance(g1,g2) As dist_g1_g2, ST_Distance(g2,g1) AS dist_g2_g1
+ FROM (SELECT 'POINT(18.5107234 54.7587757)'::geography As g1, 'POINT(18.58218 54.7344227)'::geography As g2) As a;
+
-- Clean up
DELETE FROM spatial_ref_sys;
#2423|POLYGON((-10 0,-9.2388 3.82683,-7.07107 7.07107,-3.82683 9.2388,0 10,3.82683 9.2388,7.07107 7.07107,9.2388 3.82683,10 0,-10 0))
#2424|MULTILINESTRING((0 0,10 0,24 3,30 10))
#2427|POINT(-1 0)
+#2168|5340.762373947|5340.762373947