v11-002-Introduce_make_join_rel_common.patch

diff --git a/src/backend/optimizer/path/joinrels.c b/src/backend/optimizer/path/joinrels.c
index dfbbfdac6d..45255e6ee0 100644
--- a/src/backend/optimizer/path/joinrels.c
+++ b/src/backend/optimizer/path/joinrels.c
@@ -38,6 +38,8 @@ static bool is_dummy_rel(RelOptInfo *rel);
 static bool restriction_is_constant_false(List *restrictlist,
 							  RelOptInfo *joinrel,
 							  bool only_pushed_down);
+static RelOptInfo *make_join_rel_common(PlannerInfo *root, RelOptInfo *rel1,
+					 RelOptInfo *rel2);
 static void populate_joinrel_with_paths(PlannerInfo *root, RelOptInfo *rel1,
 							RelOptInfo *rel2, RelOptInfo *joinrel,
 							SpecialJoinInfo *sjinfo, List *restrictlist);
@@ -657,21 +659,12 @@ join_is_legal(PlannerInfo *root, RelOptInfo *rel1, RelOptInfo *rel2,
 	return true;
 }
 
-
 /*
- * make_join_rel
- *	   Find or create a join RelOptInfo that represents the join of
- *	   the two given rels, and add to it path information for paths
- *	   created with the two rels as outer and inner rel.
- *	   (The join rel may already contain paths generated from other
- *	   pairs of rels that add up to the same set of base rels.)
- *
- * NB: will return NULL if attempted join is not valid.  This can happen
- * when working with outer joins, or with IN or EXISTS clauses that have been
- * turned into joins.
- */
-RelOptInfo *
-make_join_rel(PlannerInfo *root, RelOptInfo *rel1, RelOptInfo *rel2)
+ * make_join_rel_common
+ *     The workhorse of make_join_rel().
+   */
+static RelOptInfo *
+make_join_rel_common(PlannerInfo *root, RelOptInfo *rel1, RelOptInfo *rel2)
 {
 	Relids		joinrelids;
 	SpecialJoinInfo *sjinfo;
@@ -754,6 +747,24 @@ make_join_rel(PlannerInfo *root, RelOptInfo *rel1, RelOptInfo *rel2)
 }
 
 /*
+ * make_join_rel
+ *	   Find or create a join RelOptInfo that represents the join of
+ *	   the two given rels, and add to it path information for paths
+ *	   created with the two rels as outer and inner rel.
+ *	   (The join rel may already contain paths generated from other
+ *	   pairs of rels that add up to the same set of base rels.)
+ *
+ * NB: will return NULL if attempted join is not valid.  This can happen when
+ * working with outer joins, or with IN or EXISTS clauses that have been
+ * turned into joins.
+ */
+RelOptInfo *
+make_join_rel(PlannerInfo *root, RelOptInfo *rel1, RelOptInfo *rel2)
+{
+	return make_join_rel_common(root, rel1, rel2);
+}
+
+/*
  * populate_joinrel_with_paths
  *	  Add paths to the given joinrel for given pair of joining relations. The
  *	  SpecialJoinInfo provides details about the join and the restrictlist