Function create_resultscan_path

src/backend/optimizer/util/pathnode.c:3490–3523

* create_resultscan_path * Creates a path corresponding to a scan of an RTE_RESULT relation, * returning the pathnode. */

 *	  returning the pathnode.
 */
Path *
create_resultscan_path(PlannerInfo *root, RelOptInfo *rel,
					   Relids required_outer)
{
	Path	   *pathnode = makeNode(Path);

	pathnode->pathtype = T_Result;
	pathnode->parent = rel;
	pathnode->pathtarget = rel->reltarget;
	pathnode->param_info = get_baserel_parampathinfo(root, rel,
													 required_outer);
	pathnode->parallel_aware = false;
	pathnode->parallel_safe = rel->consider_parallel;
	pathnode->parallel_workers = 0;
	pathnode->pathkeys = NIL;	/* result is always unordered */
	pathnode->rescannable = true;

	{
		char		exec_location;
		exec_location = check_execute_on_functions((Node *) rel->reltarget->exprs);

		/*
		 * A function with EXECUTE ON { COORDINATOR | ALL SEGMENTS } attribute
		 * must be a set-returning function, a subquery has set-returning 
		 * functions in tlist can't be pulled up as RTE_RESULT relation.
		 */
		Assert(exec_location == PROEXECLOCATION_ANY);
		CdbPathLocus_MakeGeneral(&pathnode->locus);
	}

	cost_resultscan(pathnode, root, rel, pathnode->param_info);

	return pathnode;
}

/*
 * create_worktablescan_path