Re: invalidating cached plans

"Qingqing Zhou" <zhouqq(at)cs(dot)toronto(dot)edu> writes:
> "Neil Conway" <neilc(at)samurai(dot)com> writes
>> PostgreSQL should invalidate a cached query plan when one of the objects
>> the plan depends upon is modified.

> It just comes into my mind that current cache invalidation implementation
> may need to consider the future query result cache.

There isn't likely ever to be a query result cache. The idea has been
proposed before and rejected before: too much complexity and overhead
for too little prospective gain. If you need such a thing it makes
more sense to do it on the application side and save a network round
trip.

regards, tom lane