Converts the geometry to a multi-surface value.
SELECT NEW ST_GeomCollection().ST_ToMultiSurface()
The following example returns the result MultiSurface (((3 3, 8 3, 4 8, 3 3))).
SELECT Shape.ST_ToMultiSurface() FROM SpatialShapes WHERE ShapeID = 22
SQL/MM (ISO/IEC 13249-3: 2006) 5.1.33