AbacusSql.select

You're seeing just the function select, go back to AbacusSql module for more information.
Link to this function

select(query, key, term, opts \\ [])

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Specs

select(Ecto.Query.t(), atom() | String.t(), t(), options()) :: Ecto.Query.t()

Adds or merges a selection to the query.

Example:

query = from u in User
query = select(query, "name", ~S[concat(name, " (", count(blog_posts.id), " posts)")])
Repo.all(query) == [%{"name" => "Peter (31 posts)"}, %{"name" => "Mark (13 posts)"}]