Function create_foreignscan_path

src/backend/optimizer/util/pathnode.c:3647–3686

* create_foreignscan_path * Creates a path corresponding to a scan of a foreign base table, * returning the pathnode. * * This function is never called from core Postgres; rather, it's expected * to be called by the GetForeignPaths function of a foreign data wrapper. * We make the FDW supply all fields of the path, since we do not have any way * to calculate them in core. However, ther

 * the pathtarget (rel->reltarget), so we let a NULL for "target" select that.
 */
ForeignPath *
create_foreignscan_path(PlannerInfo *root, RelOptInfo *rel,
						PathTarget *target,
						double rows, Cost startup_cost, Cost total_cost,
						List *pathkeys,
						Relids required_outer,
						Path *fdw_outerpath,
						List *fdw_private)
{
	ForeignPath *pathnode = makeNode(ForeignPath);

	/* Historically some FDWs were confused about when to use this */
	Assert(IS_SIMPLE_REL(rel));

	pathnode->path.pathtype = T_ForeignScan;
	pathnode->path.parent = rel;
	pathnode->path.pathtarget = target ? target : rel->reltarget;
	pathnode->path.param_info = get_baserel_parampathinfo(root, rel,
														  required_outer);
	pathnode->path.parallel_aware = false;
	pathnode->path.parallel_safe = rel->consider_parallel;
	pathnode->path.parallel_workers = 0;
	pathnode->path.rows = rows;
	pathnode->path.startup_cost = startup_cost;
	pathnode->path.total_cost = total_cost;
	pathnode->path.pathkeys = pathkeys;
	if (Gp_role == GP_ROLE_DISPATCH)
	{
		make_cdbpathlocus_for_foreign_relations(root, rel, pathnode);
	}
	else
	{
		/* make entry locus for utility role */
		CdbPathLocus_MakeEntry(&(pathnode->path.locus));
	}
	pathnode->fdw_outerpath = fdw_outerpath;
	pathnode->fdw_private = fdw_private;

	return pathnode;
}

/*
 * create_foreign_join_path