Amin <amin.fallahi@gmail.com> writes:
> The goal is to have access to all the tables that are being scanned or will
> be scanned as a part of the query. Basically, the callback looks like this:
> typedef void (*set_rel_pathlist_hook_type) (PlannerInfo *root,
> RelOptInfo *rel,
> Index rti,
> RangeTblEntry *rte);
> Now, the problem is when there is a nested query, the function will be
> called once for the parent query and once for the subquery. However, I need
> access to the whole query in this function. There seems to be no CustomScan
> callback before this that has the whole query passed to it. Is there any
> way I can get access to the complete query (or all the relations in the
> query) by using the parameters passed to this function? Or any other
> workaround?
Everything the planner knows is accessible via the "root" pointer.
I very strongly question the idea that a custom scan provider should
be doing what you say you want to do, but the info is there.
regards, tom lane
