[HACKERS] Planner hints in Postgresql

[Rajmohan C]

I am implementing Planner hints in Postgresql to force the optimizer to
select a particular plan for a query on request from sql input. I am having
trouble in modifying the planner code. I want to create a path node of hint
plan and make it the plan to be used by executor. How do I enforce this ?
Should I create a new Plan for this ..how to create a plan node which can
be then given directly to executor for a particular query?