Function copy_generic_path_info

src/backend/optimizer/plan/createplan.c:6580–6589

* Copy cost and size info from a Path node to the Plan node created from it. * The executor usually won't use this info, but it's needed by EXPLAIN. * Also copy the parallel-related flags, which the executor *will* use. */

 * Also copy the parallel-related flags, which the executor *will* use.
 */
static void
copy_generic_path_info(Plan *dest, Path *src)
{
	dest->startup_cost = src->startup_cost;
	dest->total_cost = src->total_cost;
	dest->plan_rows = src->rows;
	dest->plan_width = src->pathtarget->width;
	dest->parallel_aware = src->parallel_aware;
	dest->parallel_safe = src->parallel_safe;
}

/*
 * Copy cost and size info from a lower plan node to an inserted node.