Noticed while working in this area. This code was introduced in PG15,
which is still in beta, so backpatch to there for consistency.
Backpatch-through: 15
List **group_clauses);
extern List *get_useful_group_keys_orderings(PlannerInfo *root, double nrows,
List *path_pathkeys,
- List *pathkeys, List *clauses);
+ List *group_pathkeys, List *group_clauses);
extern Path *get_cheapest_path_for_pathkeys(List *paths, List *pathkeys,
Relids required_outer,
CostSelector cost_criterion,