SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function toTypeName (children 1)
     ExpressionList (children 1)
      Function dictGetKeys (children 1)
       ExpressionList (children 3)
        Literal \'dict_complex1_kv\'
        Literal \'attr\'
        Literal UInt64_1
