SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 2)
    Identifier x
    Identifier y
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      Subquery (children 1)
       SelectWithUnionQuery (children 1)
        ExpressionList (children 2)
         SelectQuery (children 2)
          ExpressionList (children 3)
           Identifier x
           Identifier y
           Identifier y
          TablesInSelectQuery (children 1)
           TablesInSelectQueryElement (children 1)
            TableExpression (children 1)
             Subquery (children 1)
              SelectWithUnionQuery (children 1)
               ExpressionList (children 1)
                SelectQuery (children 1)
                 ExpressionList (children 2)
                  Literal UInt64_1 (alias x)
                  Literal UInt64_2 (alias y)
         SelectQuery (children 2)
          ExpressionList (children 3)
           Identifier x
           Identifier x
           Identifier y
          TablesInSelectQuery (children 1)
           TablesInSelectQueryElement (children 1)
            TableExpression (children 1)
             Subquery (children 1)
              SelectWithUnionQuery (children 1)
               ExpressionList (children 1)
                SelectQuery (children 1)
                 ExpressionList (children 2)
                  Literal UInt64_3 (alias x)
                  Literal UInt64_4 (alias y)
   ExpressionList (children 2)
    OrderByElement (children 1)
     Identifier x
    OrderByElement (children 1)
     Identifier y
