RE: [HACKERS] Cache query (PREPARE/EXECUTE)

On Thu, 24 Feb 2000, Hiroshi Inoue wrote:

> > This is overly conservative. It should be safe to destroy a plan tree
> > via freeObject() if it was created via copyObject() --- and that is
> > certainly how the plan would get into a permanent memory context.
> >
>
> I proposed the implementation of copyObject() which keeps the
> references among objects once before. It seems unnatural to me
> that such kind of implementation would never be allowed by this
> restriction.
>
> Why is memory context per plan bad ?

One context is more simple.

We talking about a *cache*. If exist interface for this cache and
all operations are with copy/freeObject it not has restriction.

For how action it will restriction?

The PlanCacheMemoryContext will store space only, it isn't space for
any action.

Karel Z.