List all transformation/ aggregation in a query

I have a long query with many transformations. I need to list all aggregation and transformation done within the query.

For example

select sum(a)as product,
sum(quantity)as salesprice,
productcodefrom factSalesgroupby
productcode

As result, I need

Transformation    column------------------------------------
sum(a)            product
sum(quantity)     salespricegroupby
productcode       Regroupment

Is there a way to do it?