Scalar values aliasing

[Nosfistis]

At the moment while it is possible to add scalar values (e.g. SELECT 1) with .function('1'), it is not possible to alias them, which is particularly useful in cases such as unions. For example:

SELECT 1 AS priority, col FROM a UNION SELECT 2 AS priority, col FROM b;

It is not possible to get the priority column from this query at the moment.