Add canAssign from CHAR and VARCHAR to PolyGeometry

Makes the validation pass, which results in a better error message
later.

core/src/main/java/org/polypheny/db/type/PolyTypeUtil.java

@@ -519,6 +519,12 @@ public static boolean canAssignFrom( AlgDataType toType, AlgDataType fromType )
             return false;
         }
 
+        if ( toType.getPolyType().getFamily() == PolyTypeFamily.GEO ) {
+            if ( fromType.getPolyType() == PolyType.CHAR || fromType.getPolyType() == PolyType.VARCHAR ) {
+                return true;
+            }
+        }
+
         return toType.getFamily() == fromType.getFamily();
     }