Re: track generic and custom plans in pg_stat_statements

> this for better tracking. By adding a CachedPlanSource::cplan link, we
> can establish a connection to the entire PlanCache entry instead of only
> CachedPlan within a queryDesc and, consequently, make it accessible from
> the executor. This would give an access to statistics on costs and the
> number of replannings.

This maybe out of scope for this patch, but can you elaborate on what you mean
by "CachedPlanSource::cplan link" ?

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Sami