SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 4)
   ExpressionList (children 3)
    Identifier t.a
    Identifier t.a (alias t_a)
    Function max (children 1)
     ExpressionList (children 1)
      Identifier s.a
   TablesInSelectQuery (children 3)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier t
    TablesInSelectQueryElement (children 2)
     TableExpression (children 1)
      TableIdentifier s
     TableJoin (children 1)
      Function equals (children 1)
       ExpressionList (children 2)
        Identifier t.a
        Identifier s.a
    TablesInSelectQueryElement (children 2)
     TableExpression (children 1)
      TableIdentifier y
     TableJoin (children 1)
      Function equals (children 1)
       ExpressionList (children 2)
        Identifier y.b
        Identifier s.b
   ExpressionList (children 1)
    Identifier t.a
   ExpressionList (children 1)
    OrderByElement (children 1)
     Identifier t.a
