1RingsCutAtNodes - non-polygon (linestring)
2:memory: #use in-memory database
3SELECT RingsCutAtNodes(GeomFromText('LINESTRING(1 3, 2 6)'))
41 # rows (not including the header row)
51 # columns
6RingsCutAtNodes(GeomFromText('LINESTRING(1 3, 2 6)'))
7(NULL)