SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 1)
    Asterisk
   TablesInSelectQuery (children 3)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      Subquery (alias x) (children 1)
       SelectWithUnionQuery (children 1)
        ExpressionList (children 1)
         SelectQuery (children 2)
          ExpressionList (children 1)
           Function array (alias dummy) (children 1)
            ExpressionList (children 2)
             Identifier dummy
             Identifier dummy
          TablesInSelectQuery (children 1)
           TablesInSelectQueryElement (children 1)
            TableExpression (children 1)
             TableIdentifier system.one
    TablesInSelectQueryElement (children 1)
     ArrayJoin (children 1)
      ExpressionList (children 1)
       Identifier dummy
    TablesInSelectQueryElement (children 2)
     TableExpression (children 1)
      TableIdentifier system.one (alias y)
     TableJoin (children 1)
      Function equals (children 1)
       ExpressionList (children 2)
        Identifier x.dummy
        Identifier y.dummy
