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Extensions can stash data computed at plan time into this list using planner_shutdown_hook (or perhaps other mechanisms) and then access it from any code that has access to the PlannedStmt (such as explain hooks), allowing for extensible debugging and instrumentation of plans. Reviewed-by: Andrei Lepikhov <lepihov@gmail.com> Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us> Discussion: http://postgr.es/m/CA+TgmoYWKHU2hKr62Toyzh-kTDEnMDeLw7gkOOnjL-TnOUq0kQ@mail.gmail.com