Phoenix chunk huge files

So Phoenix, actually Plug, has a way to chunkify a response back to the client. This allowed us to create a stream out of an ecto query, then pipe that stream into a csv encoder and finally to Plug.Conn.chunk/2, which end up solving the huge memory spikes that we had when downloading a CSV. Here's a pseudo-code:

my_ecto_query
|> Repo.stream()
|> CSV.encode() # external lib that encodes from a stream into CSV
|> Enum.reduce_while(conn, fn chunk, conn ->
  case Conn.chunk(conn, chunk) do
    {:ok, conn} -> {:cont, conn}
    _ -> {:halt, conn}
  end
end)