// TODO(coopernurse): add type-specific converter
		return driver.Null{Converter: driver.DefaultParameterConverter}
	case "datetime":
		return driver.NotNull{Converter: driver.DefaultParameterConverter}
	case "nulldatetime":
		return driver.Null{Converter: driver.DefaultParameterConverter}
	case "any":
		return anyTypeConverter{}
	}
	panic("invalid fakedb column type of " + typ)
}