How to use raw sql with ecto Repo

I have an upsert requirement, so I need to call a postgres stored procedure or use a common table expression. I also use the pgcrypto exgtension for passwords and would like to use postgres functions (such as "crypt" to encode/decode passwords). But I can not find a way to get Ecto to play with raw sql in part or whole, is it intended that ecto will only support the elixir dsl and not allow shelli

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http://sorentwo.com/2016/02/08/folding-window-functions-into-ecto.html