SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function toColumnTypeName (children 1)
     ExpressionList (children 1)
      Function array (children 1)
       ExpressionList (children 1)
        Function assumeNotNull (children 1)
         ExpressionList (children 1)
          Function materialize (children 1)
           ExpressionList (children 1)
            Literal NULL
