TypeMapper is not serializable, cause error when used in Broadcast State

[qingwei91]

Hi, I am using scala.math.BigDecimal in broadcast state, and it is not working.

I believe it is caused by TypeMapper which is used to handle java=>scala BigDecimal mapping, and broadcast state required the TypeInfo to be serializable.

I think this can be fixed by making TypeMapper serializable, do you think this is the right fix?

[jasiskis]

Same issue here.