Remove changing volatile to singleqe

src/backend/optimizer/path/allpaths.c

@@ -162,7 +162,6 @@ static void remove_unused_subquery_outputs(Query *subquery, RelOptInfo *rel);
 static void bring_to_outer_query(PlannerInfo *root, RelOptInfo *rel, List *outer_quals);
 static void bring_to_singleQE(PlannerInfo *root, RelOptInfo *rel);
 static bool is_query_contain_limit_groupby(Query *parse);
-static void handle_gen_seggen_volatile_path(PlannerInfo *root, RelOptInfo *rel);
 
 
 /*
@@ -645,40 +644,6 @@ bring_to_singleQE(PlannerInfo *root, RelOptInfo *rel)
 	set_cheapest(rel);
 }
 
-/*
- * handle_gen_seggen_volatile_path
- *
- * Only use for base replicated rel.
- * Change the path in its pathlist if match the pattern
- * (segmentgeneral or general path contains volatile restrictions).
- */
-static void
-handle_gen_seggen_volatile_path(PlannerInfo *root, RelOptInfo *rel)
-{
-	List	   *origpathlist;
-	ListCell   *lc;
-
-	origpathlist = rel->pathlist;
-	rel->cheapest_startup_path = NULL;
-	rel->cheapest_total_path = NULL;
-	rel->cheapest_unique_path = NULL;
-	rel->cheapest_parameterized_paths = NIL;
-	rel->pathlist = NIL;
-
-	foreach(lc, origpathlist)
-	{
-		Path	     *origpath = (Path *) lfirst(lc);
-		Path	     *path;
-
-		path = turn_volatile_seggen_to_singleqe(root,
-												origpath,
-												(Node *) (rel->baserestrictinfo));
-		add_path(rel, path);
-	}
-
-	set_cheapest(rel);
-}
-
 /*
  * set_rel_pathlist
  *	  Build access paths for a base relation
@@ -750,14 +715,6 @@ set_rel_pathlist(PlannerInfo *root, RelOptInfo *rel,
 		}
 	}
 
-	/*
-	 * Greenplum specific behavior:
-	 * Change the path in pathlist if it is a general or segmentgeneral
-	 * path that contains volatile restrictions.
-	 */
-	if (rel->reloptkind == RELOPT_BASEREL)
-		handle_gen_seggen_volatile_path(root, rel);
-
 	/*
 	 * Allow a plugin to editorialize on the set of Paths for this base
 	 * relation.  It could add new paths (such as CustomPaths) by calling

src/test/regress/expected/bfv_planner.out

@@ -407,13 +407,12 @@ where x.a > random();
 ----------------------------------------------------------------
  Gather Motion 3:1  (slice1; segments: 3)
    ->  Nested Loop
-         ->  Broadcast Motion 1:3  (slice2; segments: 1)
-               ->  Function Scan on generate_series a
-                     Filter: ((a)::double precision > random())
+         ->  Function Scan on generate_series a
+               Filter: ((a)::double precision > random())
          ->  Materialize
                ->  Seq Scan on t_hashdist
  Optimizer: Postgres query optimizer
-(8 rows)
+(7 rows)
 
 ---- join qual
 explain (costs off) select * from