SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 3)
    Function equals (children 1)
     ExpressionList (children 2)
      Function currentUser (children 1)
       ExpressionList
      Function user (children 1)
       ExpressionList
    Function equals (children 1)
     ExpressionList (children 2)
      Function currentUser (children 1)
       ExpressionList
      Function USER (children 1)
       ExpressionList
    Function equals (children 1)
     ExpressionList (children 2)
      Function current_user (children 1)
       ExpressionList
      Function currentUser (children 1)
       ExpressionList