SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 1)
    Identifier X
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      Subquery (children 1)
       SelectWithUnionQuery (children 1)
        ExpressionList (children 3)
         SelectQuery (children 1)
          ExpressionList (children 1)
           Literal UInt64_3 (alias X)
         SelectQuery (children 1)
          ExpressionList (children 1)
           Literal UInt64_2 (alias X)
         SelectQuery (children 1)
          ExpressionList (children 1)
           Literal UInt64_1 (alias X)
   ExpressionList (children 1)
    OrderByElement (children 1)
     Identifier X