That's it. I am not totally sure, because if type 1 was boolean and type 2 is integer, the second is more general and should work too. If bronze data does not define types for col10 (which I assume not, because there are two different types for the same column), you should be able to specify a single type for col10 so it works (you will need to make a refresh of silver table of course).

Let me know it it works! I hope so 🙂