[{(:articles/list
 {:filter [:and [:= false :article/hidden]
                {:article/author [:= :user/username "lucy"]}]})
  [:article/title
   :article/created-date
   {:article/author [:user/id :user/username :user/karma]}]}]
id
title
author_id
hidden
created_date
1
Hello world
10
false
2018-10-11
2
Welcome
20
false
2018-11-10
3
Unfinished
20
true
2018-09-20
id
username
karma
10
mark
21
20
lucy
42
{:articles/list
 [{:article/title "Welcome"
   :article/created-date "2018-11-10"
   :article/author {:user/id 20
                    :user/username "lucy"
                    :user/karma 42}}]}