Function create_samplescan_path

src/backend/optimizer/util/pathnode.c:1056–1080

* create_samplescan_path * Creates a path node for a sampled table scan. */

 *	  Creates a path node for a sampled table scan.
 */
Path *
create_samplescan_path(PlannerInfo *root, RelOptInfo *rel, Relids required_outer)
{
	Path	   *pathnode = makeNode(Path);

	pathnode->pathtype = T_SampleScan;
	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;	/* samplescan has unordered result */

	pathnode->locus = cdbpathlocus_from_baserel(root, rel, 0);
	pathnode->motionHazard = false;
	pathnode->barrierHazard = false;
	pathnode->rescannable = true;
	pathnode->sameslice_relids = rel->relids;

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

	return pathnode;
}

/*
 * create_index_path