use_cheapest_total_path.patch

diff --git a/src/backend/optimizer/path/allpaths.c b/src/backend/optimizer/path/allpaths.c
index 1c792a0..f6b0208 100644
--- a/src/backend/optimizer/path/allpaths.c
+++ b/src/backend/optimizer/path/allpaths.c
@@ -2453,7 +2453,8 @@ set_worktable_pathlist(PlannerInfo *root, RelOptInfo *rel, RangeTblEntry *rte)
  * we must do something.)
  */
 void
-generate_gather_paths(PlannerInfo *root, RelOptInfo *rel, bool override_rows)
+generate_gather_paths(PlannerInfo *root, RelOptInfo *rel,
+					  bool override_rows)
 {
 	Path	   *cheapest_partial_path;
 	Path	   *simple_gather_path;
diff --git a/src/backend/optimizer/plan/planner.c b/src/backend/optimizer/plan/planner.c
index e4f9bd4..e8f6cc5 100644
--- a/src/backend/optimizer/plan/planner.c
+++ b/src/backend/optimizer/plan/planner.c
@@ -6101,7 +6101,7 @@ add_paths_to_grouping_rel(PlannerInfo *root, RelOptInfo *input_rel,
 			 */
 			if (!pathkeys_contained_in(root->group_pathkeys, path->pathkeys))
 			{
-				if (path != linitial(partially_grouped_rel->pathlist))
+				if (path != partially_grouped_rel->cheapest_total_path)
 					continue;
 				path = (Path *) create_sort_path(root,
 												 grouped_rel,
@@ -6186,9 +6186,7 @@ add_paths_to_grouping_rel(PlannerInfo *root, RelOptInfo *input_rel,
 		 */
 		if (partially_grouped_rel->pathlist)
 		{
-			Path	   *path;
-
-			path = (Path *) linitial(partially_grouped_rel->pathlist);
+			Path	   *path = partially_grouped_rel->cheapest_total_path;
 
 			hashaggtablesize = estimate_hashagg_tablesize(path,
 														  agg_final_costs,
@@ -6369,6 +6367,9 @@ add_paths_to_partial_grouping_rel(PlannerInfo *root,
 
 		add_path(partially_grouped_rel, path);
 	}
+
+	/* Now choose the best path(s) */
+	set_cheapest(partially_grouped_rel);
 }
 
 /*
diff --git a/src/include/optimizer/paths.h b/src/include/optimizer/paths.h
index 2011f66..94f9bb2 100644
--- a/src/include/optimizer/paths.h
+++ b/src/include/optimizer/paths.h
@@ -54,7 +54,7 @@ extern RelOptInfo *standard_join_search(PlannerInfo *root, int levels_needed,
 					 List *initial_rels);
 
 extern void generate_gather_paths(PlannerInfo *root, RelOptInfo *rel,
-		bool override_rows);
+					  bool override_rows);
 extern int compute_parallel_worker(RelOptInfo *rel, double heap_pages,
 						double index_pages, int max_workers);
 extern void create_partial_bitmap_paths(PlannerInfo *root, RelOptInfo *rel,