Function SPI_keepplan

src/backend/executor/spi.c:1003–1028

}

int
SPI_keepplan(SPIPlanPtr plan)
{
	ListCell   *lc;

	if (plan == NULL || plan->magic != _SPI_PLAN_MAGIC ||
		plan->saved || plan->oneshot)
		return SPI_ERROR_ARGUMENT;

	/*
	 * Mark it saved, reparent it under CacheMemoryContext, and mark all the
	 * component CachedPlanSources as saved.  This sequence cannot fail
	 * partway through, so there's no risk of long-term memory leakage.
	 */
	plan->saved = true;
	MemoryContextSetParent(plan->plancxt, CacheMemoryContext);

	foreach(lc, plan->plancache_list)
	{
		CachedPlanSource *plansource = (CachedPlanSource *) lfirst(lc);

		SaveCachedPlan(plansource);
	}

	return 0;
}

SPIPlanPtr
SPI_saveplan(SPIPlanPtr plan)