1singlesidedbuffer - LINESTRING -X, float radius, right side 2:memory: #use in-memory database 3SELECT AsText(SingleSidedBuffer(GeomFromText('LINESTRING(0 20, 0 0)'), 3.5, 0)); 41 # rows (not including the header row) 51 # columns 6AsText(SingleSidedBuffer(GeomFromText('LINESTRING(0 20, 0 0)'), 3.5, 0)) 7POLYGON((0 20, 0 0, -3.5 0, -3.5 20, 0 20)) 8