SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function reverse (children 1)
     ExpressionList (children 1)
      Function array (children 1)
       ExpressionList (children 3)
        Function array (children 1)
         ExpressionList
        Literal Array_[\'\']
        Literal Array_[NULL]