1union - MULTILINESTRING (two Lines)
2:memory: #use in-memory database
3SELECT AsText(GUnion(GeomFromText('LINESTRING(30 30, 31 31)'), GeomFromText('LINESTRING(20 20, 10 10)')));
41 # rows (not including the header row)
51 # columns
6AsText(GUnion(GeomFromText('LINESTRING(30 30, 31 31)'), GeomFromText('LINESTRING(20 20, 10 10)')))
7MULTILINESTRING((30 30, 31 31), (20 20, 10 10))
8