makepolygon - Linestring NULL interiors
:memory: #use in-memory database
SELECT ST_MakePolygon(GeomFromText('LINESTRING(1 1, 1 20, 20 20, 20 1, 1 1)', 4326), NULL);
1 # rows (not including the header row)
1 # columns
ST_MakePolygon(GeomFromText('LINESTRING(1 1, 1 20, 20 20, 20 1, 1 1)', 4326), NULL);
(NULL)