SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 2)
    Identifier base.id (alias base.id)
    Identifier derived1.value1 (alias derived1.value1)
   TablesInSelectQuery (children 2)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier base (alias base)
    TablesInSelectQueryElement (children 2)
     TableExpression (children 1)
      TableIdentifier derived1 (alias derived1)
     TableJoin (children 1)
      Function equals (children 1)
       ExpressionList (children 2)
        Identifier base.id
        Identifier derived1.id1
