SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 2)
    QualifiedAsterisk (children 1)
     Identifier s
    QualifiedAsterisk (children 1)
     Identifier j
   TablesInSelectQuery (children 2)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      Subquery (alias s) (children 1)
       SelectWithUnionQuery (children 1)
        ExpressionList (children 1)
         SelectQuery (children 2)
          ExpressionList (children 1)
           Asterisk
          TablesInSelectQuery (children 1)
           TablesInSelectQueryElement (children 1)
            TableExpression (children 1)
             TableIdentifier X
    TablesInSelectQueryElement (children 2)
     TableExpression (children 1)
      Subquery (alias j) (children 1)
       SelectWithUnionQuery (children 1)
        ExpressionList (children 1)
         SelectQuery (children 2)
          ExpressionList (children 1)
           Asterisk
          TablesInSelectQuery (children 1)
           TablesInSelectQueryElement (children 1)
            TableExpression (children 1)
             TableIdentifier Y
     TableJoin (children 1)
      Function equals (children 1)
       ExpressionList (children 2)
        Identifier s.id
        Identifier j.id
   ExpressionList (children 6)
    OrderByElement (children 1)
     Identifier s.id
    OrderByElement (children 1)
     Identifier s.x_a
    OrderByElement (children 1)
     Identifier s.x_b
    OrderByElement (children 1)
     Identifier j.id
    OrderByElement (children 1)
     Identifier j.y_a
    OrderByElement (children 1)
     Identifier j.y_b