ExportedSelectElement

A root level query that has nested queries (or refers to queries in an outer scope) will have SelectElements that are ExportedSelectElement, the 'actualSelectElement' points directly to the referred AST node, while 'target' refers to it indirectly (see target)

In the following select :

 select t.x from t

t.x is a select element and t is it's origin

Here q.z1 is a SelectElement who's origin is t

 select q.z1
 from
   (select t.x as z1 from t) q

Returns a string representation of the object.

The default representation is platform dependent.

strictly for logging purposes, i.e. to display a more explicit AST

Update, Insert, and Delete statements are always at the root of an AST, so they are never aliased, but then can have sub queries, ex.: update ... where x in (subquery). Name clashes are impossible since SelectElements of query are always aliased.

visitor's args are : -the visited node, -it's parent -it's depth

target points to the selectElement that this ExportSelectElement refers to, who can also be an ExportSelectElement, whose target will point to its inner select element, recursively, until it becomes equal to the 'end' target, the actualSelectElement In other words : exportSelectElement.target.target.,...,.target == exportSelectElement.actualSelectElement