diff --git a/contrib/postgres_fdw/expected/postgres_fdw.out b/contrib/postgres_fdw/expected/postgres_fdw.out
index 020350fb37997f0886e9051fff3cf05b33c262a7..65b1e86b5fad44449707f504a0db21868c1114f1 100644
--- a/contrib/postgres_fdw/expected/postgres_fdw.out
+++ b/contrib/postgres_fdw/expected/postgres_fdw.out
@@ -5088,6 +5088,25 @@ SELECT * from loc1;
2 | skidoo triggered !
(2 rows)
+EXPLAIN (verbose, costs off)
+UPDATE rem1 set f1 = 10; -- all columns should be transmitted
+ QUERY PLAN
+-----------------------------------------------------------------------
+ Update on public.rem1
+ Remote SQL: UPDATE public.loc1 SET f1 = $2, f2 = $3 WHERE ctid = $1
+ -> Foreign Scan on public.rem1
+ Output: 10, f2, ctid, rem1.*
+ Remote SQL: SELECT f1, f2, ctid FROM public.loc1 FOR UPDATE
+(5 rows)
+
+UPDATE rem1 set f1 = 10;
+SELECT * from loc1;
+ f1 | f2
+----+--------------------------------
+ 10 | skidoo triggered ! triggered !
+ 10 | skidoo triggered ! triggered !
+(2 rows)
+
DELETE FROM rem1;
-- Add a second trigger, to check that the changes are propagated correctly
-- from trigger to trigger
@@ -5200,7 +5219,7 @@ NOTICE: trig_row_after(23, skidoo) AFTER ROW INSERT ON rem1
NOTICE: NEW: (13,"test triggered !")
ctid
--------
- (0,27)
+ (0,29)
(1 row)
-- cleanup
@@ -5304,10 +5323,10 @@ BEFORE UPDATE ON rem1
FOR EACH ROW EXECUTE PROCEDURE trigger_data(23,'skidoo');
EXPLAIN (verbose, costs off)
UPDATE rem1 set f2 = ''; -- can't be pushed down
- QUERY PLAN
----------------------------------------------------------------------
+ QUERY PLAN
+-----------------------------------------------------------------------
Update on public.rem1
- Remote SQL: UPDATE public.loc1 SET f2 = $2 WHERE ctid = $1
+ Remote SQL: UPDATE public.loc1 SET f1 = $2, f2 = $3 WHERE ctid = $1
-> Foreign Scan on public.rem1
Output: f1, ''::text, ctid, rem1.*
Remote SQL: SELECT f1, f2, ctid FROM public.loc1 FOR UPDATE
@@ -5924,12 +5943,12 @@ AFTER UPDATE OR DELETE ON bar2
FOR EACH ROW EXECUTE PROCEDURE trigger_data(23,'skidoo');
explain (verbose, costs off)
update bar set f2 = f2 + 100;
- QUERY PLAN
---------------------------------------------------------------------------------------
+ QUERY PLAN
+--------------------------------------------------------------------------------------------------------
Update on public.bar
Update on public.bar
Foreign Update on public.bar2
- Remote SQL: UPDATE public.loct2 SET f2 = $2 WHERE ctid = $1 RETURNING f1, f2, f3
+ Remote SQL: UPDATE public.loct2 SET f1 = $2, f2 = $3, f3 = $4 WHERE ctid = $1 RETURNING f1, f2, f3
-> Seq Scan on public.bar
Output: bar.f1, (bar.f2 + 100), bar.ctid
-> Foreign Scan on public.bar2
diff --git a/contrib/postgres_fdw/postgres_fdw.c b/contrib/postgres_fdw/postgres_fdw.c
index 7630b154376d91411ab59810f5497c92b873df91..7d5629870844d8a683419c59da13caba6d9638c5 100644
--- a/contrib/postgres_fdw/postgres_fdw.c
+++ b/contrib/postgres_fdw/postgres_fdw.c
@@ -1559,12 +1559,19 @@ postgresPlanForeignModify(PlannerInfo *root,
/*
* In an INSERT, we transmit all columns that are defined in the foreign
- * table. In an UPDATE, we transmit only columns that were explicitly
- * targets of the UPDATE, so as to avoid unnecessary data transmission.
- * (We can't do that for INSERT since we would miss sending default values
- * for columns not listed in the source statement.)
- */
- if (operation == CMD_INSERT)
+ * table. In an UPDATE, if there are BEFORE ROW UPDATE triggers on the
+ * foreign table, we transmit all columns like INSERT; else we transmit
+ * only columns that were explicitly targets of the UPDATE, so as to avoid
+ * unnecessary data transmission. (We can't do that for INSERT since we
+ * would miss sending default values for columns not listed in the source
+ * statement, and for UPDATE if there are BEFORE ROW UPDATE triggers since
+ * those triggers might change values for non-target columns, in which
+ * case we would miss sending changed values for those columns.)
+ */
+ if (operation == CMD_INSERT ||
+ (operation == CMD_UPDATE &&
+ rel->trigdesc &&
+ rel->trigdesc->trig_update_before_row))
{
TupleDesc tupdesc = RelationGetDescr(rel);
int attnum;
diff --git a/contrib/postgres_fdw/sql/postgres_fdw.sql b/contrib/postgres_fdw/sql/postgres_fdw.sql
index e424ebbe1d84156109d9585e990edc8498a2eef4..a3ad6a85e3e358aaf5bf8b81943f7248101946f5 100644
--- a/contrib/postgres_fdw/sql/postgres_fdw.sql
+++ b/contrib/postgres_fdw/sql/postgres_fdw.sql
@@ -1065,6 +1065,11 @@ SELECT * from loc1;
UPDATE rem1 set f2 = 'skidoo' RETURNING f2;
SELECT * from loc1;
+EXPLAIN (verbose, costs off)
+UPDATE rem1 set f1 = 10; -- all columns should be transmitted
+UPDATE rem1 set f1 = 10;
+SELECT * from loc1;
+
DELETE FROM rem1;
-- Add a second trigger, to check that the changes are propagated correctly