Function create

src/AggregateFunctions/AggregateFunctionAvgWeighted.cpp:227–235

template <class First, class ... TArgs>
IAggregateFunction * create(const IDataType & second_type, TArgs && ... args)
{
    const WhichDataType which(second_type);

#define LINE(Type) \
    case TypeIndex::Type:       return new AggregateFunctionAvgWeighted<First, Type>(std::forward<TArgs>(args)...)
    AT_SWITCH(LINE)
#undef LINE
}

// Not using helper functions because there are no templates for binary decimal/numeric function.
template <class... TArgs>