Here's the method i want to write:

public static IEnumerable<String> GetTableNames(this IQueryable<T> query)
{
    //...
}

where the IQueryable is a linq-to-sql query (is there a more specific interface i should use?).

then if i had a query like this

var q = from c in db.Customers
        from p in db.Products
        where c.ID = 3
        select new {p.Name, p.Version};
q.GetTableNames();// return ["Customers", "Products"]

basically it would show all the tables that this query touches in the db, it is ok to execute the query to figure this out too (since that is going to happen anyway)? any ideas?