Documentation omission / question for CTE handling

The README covers CTEs briefly, but doesn't mention how to handle explicit column lists should you need it. E.g. a CTE like:

WITH my_query (col1, col2, col3, col4) AS (
  SELECT a, b, a, b FROM my_table
)

Is it possible to generate the above without a SqlLiteral? I used one in my solution, but every time I do it feels like I'm misbehaving. What's the right way?

Aside: this arose because of user-supplied queries with multiple columns of the same name b/c of joins. A query like this one:

select a.*, b.*
from a join b USING (my_id)

The above will have 2 columns named my_id. In this situation the CTE must specify the column list (with ambiguities corrected!) or the result is an ambiguous column name error (at least in PG).

rails / arel

Documentation omission / question for CTE handling #448