AbacusSql.select_list

You're seeing just the function select_list, go back to AbacusSql module for more information.
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select_list(query, terms, opts \\ [])

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Selects the given terms as a list.

Example:

query = from u in User
query = select(query, ["name", "count(blog_posts.id)"])
Repo.all(query) == [["Peter", 31], ["Mark", 13]]