6 files changed, 22 insertions, 0 deletions
diff --git a/src/include/optimizer/cost.h b/src/include/optimizer/cost.h
index 63feba06e7e..306d923a22a 100644
--- a/src/include/optimizer/cost.h
+++ b/src/include/optimizer/cost.h
@@ -67,6 +67,7 @@ extern bool enable_material;
 extern bool enable_mergejoin;
 extern bool enable_hashjoin;
 extern bool enable_gathermerge;
+extern bool enable_partition_wise_join;
 extern int	constraint_exclusion;
 
 extern double clamp_row_est(double nrows);
diff --git a/src/include/optimizer/pathnode.h b/src/include/optimizer/pathnode.h
index e372f8862b8..e9ed16ad321 100644
--- a/src/include/optimizer/pathnode.h
+++ b/src/include/optimizer/pathnode.h
@@ -251,6 +251,8 @@ extern LimitPath *create_limit_path(PlannerInfo *root, RelOptInfo *rel,
 extern Path *reparameterize_path(PlannerInfo *root, Path *path,
 					Relids required_outer,
 					double loop_count);
+extern Path *reparameterize_path_by_child(PlannerInfo *root, Path *path,
+							 RelOptInfo *child_rel);
 
 /*
  * prototypes for relnode.c
@@ -290,5 +292,9 @@ extern ParamPathInfo *get_appendrel_parampathinfo(RelOptInfo *appendrel,
 							Relids required_outer);
 extern ParamPathInfo *find_param_path_info(RelOptInfo *rel,
 					 Relids required_outer);
+extern RelOptInfo *build_child_join_rel(PlannerInfo *root,
+					 RelOptInfo *outer_rel, RelOptInfo *inner_rel,
+					 RelOptInfo *parent_joinrel, List *restrictlist,
+					 SpecialJoinInfo *sjinfo, JoinType jointype);
 
 #endif							/* PATHNODE_H */
diff --git a/src/include/optimizer/paths.h b/src/include/optimizer/paths.h
index 4e06b2e2993..a15eee54bb8 100644
--- a/src/include/optimizer/paths.h
+++ b/src/include/optimizer/paths.h
@@ -58,6 +58,8 @@ extern int compute_parallel_worker(RelOptInfo *rel, double heap_pages,
 						double index_pages);
 extern void create_partial_bitmap_paths(PlannerInfo *root, RelOptInfo *rel,
 							Path *bitmapqual);
+extern void generate_partition_wise_join_paths(PlannerInfo *root,
+								   RelOptInfo *rel);
 
 #ifdef OPTIMIZER_DEBUG
 extern void debug_print_rel(PlannerInfo *root, RelOptInfo *rel);
@@ -111,6 +113,9 @@ extern bool have_join_order_restriction(PlannerInfo *root,
 							RelOptInfo *rel1, RelOptInfo *rel2);
 extern bool have_dangerous_phv(PlannerInfo *root,
 				   Relids outer_relids, Relids inner_params);
+extern void mark_dummy_rel(RelOptInfo *rel);
+extern bool have_partkey_equi_join(RelOptInfo *rel1, RelOptInfo *rel2,
+					   JoinType jointype, List *restrictlist);
 
 /*
  * equivclass.c
diff --git a/src/include/optimizer/placeholder.h b/src/include/optimizer/placeholder.h
index 5a4d46ba9d7..a4a7b79f4da 100644
--- a/src/include/optimizer/placeholder.h
+++ b/src/include/optimizer/placeholder.h
@@ -28,5 +28,7 @@ extern void fix_placeholder_input_needed_levels(PlannerInfo *root);
 extern void add_placeholders_to_base_rels(PlannerInfo *root);
 extern void add_placeholders_to_joinrel(PlannerInfo *root, RelOptInfo *joinrel,
 							RelOptInfo *outer_rel, RelOptInfo *inner_rel);
+extern void add_placeholders_to_child_joinrel(PlannerInfo *root,
+								  RelOptInfo *childrel, RelOptInfo *parentrel);
 
 #endif							/* PLACEHOLDER_H */
diff --git a/src/include/optimizer/planner.h b/src/include/optimizer/planner.h
index 2a4cf71e102..2801bfdfbe8 100644
--- a/src/include/optimizer/planner.h
+++ b/src/include/optimizer/planner.h
@@ -58,5 +58,7 @@ extern Expr *preprocess_phv_expression(PlannerInfo *root, Expr *expr);
 extern bool plan_cluster_use_sort(Oid tableOid, Oid indexOid);
 
 extern List *get_partitioned_child_rels(PlannerInfo *root, Index rti);
+extern List *get_partitioned_child_rels_for_join(PlannerInfo *root,
+									Relids join_relids);
 
 #endif							/* PLANNER_H */
diff --git a/src/include/optimizer/prep.h b/src/include/optimizer/prep.h
index 4be0afd5660..80fbfd6ea94 100644
--- a/src/include/optimizer/prep.h
+++ b/src/include/optimizer/prep.h
@@ -62,4 +62,10 @@ extern Node *adjust_appendrel_attrs_multilevel(PlannerInfo *root, Node *node,
 extern AppendRelInfo **find_appinfos_by_relids(PlannerInfo *root,
 						Relids relids, int *nappinfos);
 
+extern SpecialJoinInfo *build_child_join_sjinfo(PlannerInfo *root,
+						SpecialJoinInfo *parent_sjinfo,
+						Relids left_relids, Relids right_relids);
+extern Relids adjust_child_relids_multilevel(PlannerInfo *root, Relids relids,
+							   Relids child_relids, Relids top_parent_relids);
+
 #endif							/* PREP_H */