diff --git a/src/backend/optimizer/util/restrictinfo.c b/src/backend/optimizer/util/restrictinfo.c
index c44bd2f815..23ab4177fa 100644
--- a/src/backend/optimizer/util/restrictinfo.c
+++ b/src/backend/optimizer/util/restrictinfo.c
@@ -563,9 +563,9 @@ clause_is_computable_at(PlannerInfo *root,
 			continue;
 
 		/* Else, trouble if clause mentions any nullable Vars. */
-		if (bms_overlap(clause_relids, sjinfo->min_righthand) ||
+		if (bms_overlap(clause_relids, sjinfo->syn_righthand) ||
 			(sjinfo->jointype == JOIN_FULL &&
-			 bms_overlap(clause_relids, sjinfo->min_lefthand)))
+			 bms_overlap(clause_relids, sjinfo->syn_lefthand)))
 			return false;		/* doesn't work */
 	}
 
diff --git a/src/test/regress/expected/join.out b/src/test/regress/expected/join.out
index 9bafadde66..af68567561 100644
--- a/src/test/regress/expected/join.out
+++ b/src/test/regress/expected/join.out
@@ -2500,6 +2500,28 @@ select * from int4_tbl t1
                      ->  Seq Scan on int4_tbl t4
 (12 rows)
 
+explain (costs off)
+select * from int4_tbl t1
+  left join (int4_tbl t2 left join int4_tbl t3 on t2.f1 > 0) on t2.f1 > 1
+  left join int4_tbl t4 on t2.f1 > 2 and t3.f1 > 3
+where t1.f1 = coalesce(t2.f1, 1);
+                     QUERY PLAN                     
+----------------------------------------------------
+ Nested Loop Left Join
+   Join Filter: ((t2.f1 > 2) AND (t3.f1 > 3))
+   ->  Nested Loop Left Join
+         Join Filter: (t2.f1 > 0)
+         ->  Nested Loop Left Join
+               Filter: (t1.f1 = COALESCE(t2.f1, 1))
+               ->  Seq Scan on int4_tbl t1
+               ->  Materialize
+                     ->  Seq Scan on int4_tbl t2
+                           Filter: (f1 > 1)
+         ->  Seq Scan on int4_tbl t3
+   ->  Materialize
+         ->  Seq Scan on int4_tbl t4
+(13 rows)
+
 --
 -- check a case where we formerly got confused by conflicting sort orders
 -- in redundant merge join path keys
diff --git a/src/test/regress/sql/join.sql b/src/test/regress/sql/join.sql
index a44234b0af..c7a39abd23 100644
--- a/src/test/regress/sql/join.sql
+++ b/src/test/regress/sql/join.sql
@@ -488,6 +488,12 @@ select * from int4_tbl t1
   left join int4_tbl t3 on t2.f1 = t3.f1
   left join int4_tbl t4 on t3.f1 != t4.f1;
 
+explain (costs off)
+select * from int4_tbl t1
+  left join (int4_tbl t2 left join int4_tbl t3 on t2.f1 > 0) on t2.f1 > 1
+  left join int4_tbl t4 on t2.f1 > 2 and t3.f1 > 3
+where t1.f1 = coalesce(t2.f1, 1);
+
 --
 -- check a case where we formerly got confused by conflicting sort orders
 -- in redundant merge join path keys