3 files changed, 30 insertions, 0 deletions
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index da705ae468b..25f3a3d1948 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -6866,6 +6866,10 @@ ATExecAddColumn(List **wqueue, AlteredTableInfo *tab, Relation rel,
 							colDef->colname, RelationGetRelationName(rel))));
 
 			table_close(attrdesc, RowExclusiveLock);
+
+			/* Make the child column change visible */
+			CommandCounterIncrement();
+
 			return InvalidObjectAddress;
 		}
 	}
diff --git a/src/test/regress/expected/inherit.out b/src/test/regress/expected/inherit.out
index 0aa0d410a12..4943429e9bf 100644
--- a/src/test/regress/expected/inherit.out
+++ b/src/test/regress/expected/inherit.out
@@ -1088,6 +1088,23 @@ Inherits: inht1,
           inhs1
 
 DROP TABLE inhts;
+-- Test for adding a column to a parent table with complex inheritance
+CREATE TABLE inhta ();
+CREATE TABLE inhtb () INHERITS (inhta);
+CREATE TABLE inhtc () INHERITS (inhtb);
+CREATE TABLE inhtd () INHERITS (inhta, inhtb, inhtc);
+ALTER TABLE inhta ADD COLUMN i int;
+NOTICE:  merging definition of column "i" for child "inhtd"
+NOTICE:  merging definition of column "i" for child "inhtd"
+\d+ inhta
+                                   Table "public.inhta"
+ Column |  Type   | Collation | Nullable | Default | Storage | Stats target | Description 
+--------+---------+-----------+----------+---------+---------+--------------+-------------
+ i      | integer |           |          |         | plain   |              | 
+Child tables: inhtb,
+              inhtd
+
+DROP TABLE inhta, inhtb, inhtc, inhtd;
 -- Test for renaming in diamond inheritance
 CREATE TABLE inht2 (x int) INHERITS (inht1);
 CREATE TABLE inht3 (y int) INHERITS (inht1);
diff --git a/src/test/regress/sql/inherit.sql b/src/test/regress/sql/inherit.sql
index e15f9c364c2..fe699c54d56 100644
--- a/src/test/regress/sql/inherit.sql
+++ b/src/test/regress/sql/inherit.sql
@@ -372,6 +372,15 @@ ALTER TABLE inhts RENAME d TO dd;
 
 DROP TABLE inhts;
 
+-- Test for adding a column to a parent table with complex inheritance
+CREATE TABLE inhta ();
+CREATE TABLE inhtb () INHERITS (inhta);
+CREATE TABLE inhtc () INHERITS (inhtb);
+CREATE TABLE inhtd () INHERITS (inhta, inhtb, inhtc);
+ALTER TABLE inhta ADD COLUMN i int;
+\d+ inhta
+DROP TABLE inhta, inhtb, inhtc, inhtd;
+
 -- Test for renaming in diamond inheritance
 CREATE TABLE inht2 (x int) INHERITS (inht1);
 CREATE TABLE inht3 (y int) INHERITS (inht1);