Fixed small issues

ibis/expr/api.py

@@ -679,14 +679,14 @@ def cast(arg, target_type):
         # noop case if passed type is the same
         return arg
 
-    if (
-        target_type.lower() in ('geometry', 'geography')
-        and (
-            arg.type().geotype == target_type
-            or (arg.type().geotype is None and target_type == 'geometry')
-        )
-    ):
-        return arg
+    if isinstance(op.to, (dt.Geography, dt.Geometry)):
+        from_geotype = arg.type().geotype
+        to_geotype = op.to.geotype
+        if (
+            from_geotype == to_geotype
+            or (from_geotype is None and to_geotype == 'geometry')
+        ):
+            return arg
 
     result = op.to_expr()
     if not arg.has_name():

ibis/expr/datatypes.py

@@ -1568,7 +1568,8 @@ def can_cast_variadic(
 # geo spatial data type
 # cast between same type, used to cast from/to geometry and geography
 @castable.register(Array, (Point, LineString, Polygon, MultiPolygon))
-@castable.register((Point, LineString, Polygon, MultiPolygon), GeoSpatial)
+@castable.register((Point, LineString, Polygon, MultiPolygon), Geometry)
+@castable.register((Point, LineString, Polygon, MultiPolygon), Geography)
 def can_cast_geospatial(source, target, **kwargs):
     return True