Mark Mielke <mark@mark.mielke.cc> writes:
> Just to point out that I agree, and as per my original post, I think the
> only time prepared statements should be re-planned for the statistics
> case, is after 'analyze' has run. That sounds like a quicker solution,
> and a much smaller gain. After 'analyze' of an object, invalidate all
> cached plans for prepared statements that rely on that object and
> require a re-plan.
Please note that that has been happening since 8.3, which is probably
why you haven't detected a problem.
> ... It's walking around the problem
> that the idea of a generic plan is just wrong. The only time a generic
> plan is right, is when the specific plan would result in the same.
I think that's a significant overstatement. There are a large number
of cases where a custom plan isn't worth it, even if it doesn't generate
exactly the same plan.
regards, tom lane
