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