Fix create_lateral_join_info to handle dead relations properly.

Commit 0a480502b092195a9b25a2f0f199a21d592a9c57 broke it.

Report by Andreas Seltenreich.  Fix by Ashutosh Bapat.

Discussion: http://postgr.es/m/874ls2vrnx.fsf@ansel.ydns.eu

2 files changed, 17 insertions, 0 deletions

diff --git a/src/test/regress/expected/join.out b/src/test/regress/expected/join.out
index 06a84e8e1c7..f47449b1c44 100644
--- a/src/test/regress/expected/join.out
+++ b/src/test/regress/expected/join.out
@@ -4060,6 +4060,18 @@ select i8.* from int8_tbl i8 left join (select f1 from int4_tbl group by f1) i4
  Seq Scan on int8_tbl i8
 (1 row)
 
+-- check join removal with lateral references
+explain (costs off)
+select 1 from (select a.id FROM a left join b on a.b_id = b.id) q,
+			  lateral generate_series(1, q.id) gs(i) where q.id = gs.i;
+                QUERY PLAN                 
+-------------------------------------------
+ Nested Loop
+   ->  Seq Scan on a
+   ->  Function Scan on generate_series gs
+         Filter: (a.id = i)
+(4 rows)
+
 rollback;
 create temp table parent (k int primary key, pd int);
 create temp table child (k int unique, cd int);
diff --git a/src/test/regress/sql/join.sql b/src/test/regress/sql/join.sql
index 8b21838e927..d847d536533 100644
--- a/src/test/regress/sql/join.sql
+++ b/src/test/regress/sql/join.sql
@@ -1336,6 +1336,11 @@ explain (costs off)
 select i8.* from int8_tbl i8 left join (select f1 from int4_tbl group by f1) i4
   on i8.q1 = i4.f1;
 
+-- check join removal with lateral references
+explain (costs off)
+select 1 from (select a.id FROM a left join b on a.b_id = b.id) q,
+			  lateral generate_series(1, q.id) gs(i) where q.id = gs.i;
+
 rollback;
 
 create temp table parent (k int primary key, pd int);