message: ensuring we have bound either finalize or combine
diff: @@ -205,7 +205,8 @@ static unique_ptr<FunctionData> BindAggregateState(ClientContext &context, Scala
  if (bound_function.name == "finalize") {
  bound_function.return_type = bound_aggr.return_type;
  - } else if (bound_function.name == "combine") {
  + } else {
  + D_ASSERT(bound_function.name == "combine");
  bound_function.return_type = arg_return_type;
  }
  