diff --git a/src/backend/executor/nodeModifyTable.c b/src/backend/executor/nodeModifyTable.c
new file mode 100644
index f419c47..1ac6517
--- a/src/backend/executor/nodeModifyTable.c
+++ b/src/backend/executor/nodeModifyTable.c
@@ -4141,12 +4141,12 @@ ExecInitModifyTable(ModifyTable *node, E
 		}
 
 		/*
-		 * For INSERT and UPDATE, prepare to evaluate any generated columns.
+		 * For INSERT/UPDATE/MERGE, prepare to evaluate any generated columns.
 		 * We must do this now, even if we never insert or update any rows,
 		 * because we have to fill resultRelInfo->ri_extraUpdatedCols for
 		 * possible use by the trigger machinery.
 		 */
-		if (operation == CMD_INSERT || operation == CMD_UPDATE)
+		if (operation == CMD_INSERT || operation == CMD_UPDATE || operation == CMD_MERGE)
 			ExecInitStoredGenerated(resultRelInfo, estate, operation);
 	}
 
diff --git a/src/test/regress/expected/generated.out b/src/test/regress/expected/generated.out
new file mode 100644
index 9867748..11940c8
--- a/src/test/regress/expected/generated.out
+++ b/src/test/regress/expected/generated.out
@@ -192,6 +192,26 @@ SELECT * FROM gtest1 ORDER BY a;
  3 | 6
 (1 row)
 
+-- test MERGE
+CREATE TABLE gtestm (
+  id int PRIMARY KEY,
+  f1 int,
+  f2 int,
+  f3 int GENERATED ALWAYS AS (f1 * 2) STORED,
+  f4 int GENERATED ALWAYS AS (f2 * 2) STORED
+);
+INSERT INTO gtestm VALUES (1, 5, 100);
+MERGE INTO gtestm t USING (VALUES (1, 10), (2, 20)) v(id, f1) ON t.id = v.id
+  WHEN MATCHED THEN UPDATE SET f1 = v.f1
+  WHEN NOT MATCHED THEN INSERT VALUES (v.id, v.f1, 200);
+SELECT * FROM gtestm ORDER BY id;
+ id | f1 | f2  | f3 | f4  
+----+----+-----+----+-----
+  1 | 10 | 100 | 20 | 200
+  2 | 20 | 200 | 40 | 400
+(2 rows)
+
+DROP TABLE gtestm;
 -- views
 CREATE VIEW gtest1v AS SELECT * FROM gtest1;
 SELECT * FROM gtest1v;
diff --git a/src/test/regress/sql/generated.sql b/src/test/regress/sql/generated.sql
new file mode 100644
index 92d373b..87ec842
--- a/src/test/regress/sql/generated.sql
+++ b/src/test/regress/sql/generated.sql
@@ -81,6 +81,21 @@ SELECT * FROM gtest1 ORDER BY a;
 DELETE FROM gtest1 WHERE b = 2;
 SELECT * FROM gtest1 ORDER BY a;
 
+-- test MERGE
+CREATE TABLE gtestm (
+  id int PRIMARY KEY,
+  f1 int,
+  f2 int,
+  f3 int GENERATED ALWAYS AS (f1 * 2) STORED,
+  f4 int GENERATED ALWAYS AS (f2 * 2) STORED
+);
+INSERT INTO gtestm VALUES (1, 5, 100);
+MERGE INTO gtestm t USING (VALUES (1, 10), (2, 20)) v(id, f1) ON t.id = v.id
+  WHEN MATCHED THEN UPDATE SET f1 = v.f1
+  WHEN NOT MATCHED THEN INSERT VALUES (v.id, v.f1, 200);
+SELECT * FROM gtestm ORDER BY id;
+DROP TABLE gtestm;
+
 -- views
 CREATE VIEW gtest1v AS SELECT * FROM gtest1;
 SELECT * FROM gtest1v;