SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function length (children 1)
     ExpressionList (children 1)
      Function dictGetKeys (children 1)
       ExpressionList (children 3)
        Literal \'dict_big\'
        Literal \'grp\'
        Literal \'123\'
