SelectWithUnionQuery (children 2)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 1)
    Identifier x
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      Subquery (children 1)
       SelectWithUnionQuery (children 1)
        ExpressionList (children 1)
         SelectQuery (children 2)
          ExpressionList (children 2)
           Identifier dummy (alias x)
           Function plus (alias dummy) (children 1)
            ExpressionList (children 2)
             Identifier dummy
             Literal UInt64_1
          ExpressionList (children 1)
           OrderByElement (children 1)
            Function identity (children 1)
             ExpressionList (children 1)
              Identifier x
 Identifier Null