1Centroid - polygonZM (problem case - GEOS throws away the Z and M coordinates)
2:memory: #use in-memory database
3SELECT astext(centroid(geomFromText('POLYGONZM((0 0 1 4, 0 2 1 4, 2 2 1 4, 2 0 1 4, 0 0 1 4))')))
41 # rows (not including the header row)
51 # columns
6astext(centroid(geomFromText('POLYGONZM((0 0 1 4, 0 2 1 4, 2 2 1 4, 2 0 1 4, 0 0 1 4))')))
7POINT(1 1)
8
9