4 files changed, 41 insertions, 2 deletions
diff --git a/src/backend/optimizer/path/allpaths.c b/src/backend/optimizer/path/allpaths.c
index d8ba7add136..b2c5c833f72 100644
--- a/src/backend/optimizer/path/allpaths.c
+++ b/src/backend/optimizer/path/allpaths.c
@@ -1973,7 +1973,8 @@ set_dummy_rel_pathlist(RelOptInfo *rel)
 	rel->partial_pathlist = NIL;
 
 	/* Set up the dummy path */
-	add_path(rel, (Path *) create_append_path(NULL, rel, NIL, NIL, NULL,
+	add_path(rel, (Path *) create_append_path(NULL, rel, NIL, NIL,
+											  rel->lateral_relids,
 											  0, false, NIL, -1));
 
 	/*
diff --git a/src/backend/optimizer/path/joinrels.c b/src/backend/optimizer/path/joinrels.c
index 699a34d6cfe..9604a54b776 100644
--- a/src/backend/optimizer/path/joinrels.c
+++ b/src/backend/optimizer/path/joinrels.c
@@ -1264,7 +1264,8 @@ mark_dummy_rel(RelOptInfo *rel)
 	rel->partial_pathlist = NIL;
 
 	/* Set up the dummy path */
-	add_path(rel, (Path *) create_append_path(NULL, rel, NIL, NIL, NULL,
+	add_path(rel, (Path *) create_append_path(NULL, rel, NIL, NIL,
+											  rel->lateral_relids,
 											  0, false, NIL, -1));
 
 	/* Set or update cheapest_total_path and related fields */
diff --git a/src/test/regress/expected/join.out b/src/test/regress/expected/join.out
index 593aec2f7d0..88fcd52ae1b 100644
--- a/src/test/regress/expected/join.out
+++ b/src/test/regress/expected/join.out
@@ -5380,6 +5380,35 @@ select * from
          Output: 3
 (11 rows)
 
+-- check dummy rels with lateral references (bug #15694)
+explain (verbose, costs off)
+select * from int8_tbl i8 left join lateral
+  (select *, i8.q2 from int4_tbl where false) ss on true;
+              QUERY PLAN              
+--------------------------------------
+ Nested Loop Left Join
+   Output: i8.q1, i8.q2, f1, (i8.q2)
+   ->  Seq Scan on public.int8_tbl i8
+         Output: i8.q1, i8.q2
+   ->  Result
+         Output: f1, i8.q2
+         One-Time Filter: false
+(7 rows)
+
+explain (verbose, costs off)
+select * from int8_tbl i8 left join lateral
+  (select *, i8.q2 from int4_tbl i1, int4_tbl i2 where false) ss on true;
+               QUERY PLAN                
+-----------------------------------------
+ Nested Loop Left Join
+   Output: i8.q1, i8.q2, f1, f1, (i8.q2)
+   ->  Seq Scan on public.int8_tbl i8
+         Output: i8.q1, i8.q2
+   ->  Result
+         Output: f1, f1, i8.q2
+         One-Time Filter: false
+(7 rows)
+
 -- check handling of nested appendrels inside LATERAL
 select * from
   ((select 2 as v) union all (select 3 as v)) as q1
diff --git a/src/test/regress/sql/join.sql b/src/test/regress/sql/join.sql
index 34d21d029f0..c247509a567 100644
--- a/src/test/regress/sql/join.sql
+++ b/src/test/regress/sql/join.sql
@@ -1783,6 +1783,14 @@ select * from
     select * from (select 3 as z offset 0) z where z.z = x.x
   ) zz on zz.z = y.y;
 
+-- check dummy rels with lateral references (bug #15694)
+explain (verbose, costs off)
+select * from int8_tbl i8 left join lateral
+  (select *, i8.q2 from int4_tbl where false) ss on true;
+explain (verbose, costs off)
+select * from int8_tbl i8 left join lateral
+  (select *, i8.q2 from int4_tbl i1, int4_tbl i2 where false) ss on true;
+
 -- check handling of nested appendrels inside LATERAL
 select * from
   ((select 2 as v) union all (select 3 as v)) as q1