diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index b53f6ed3ac3..9a1ef78a1fb 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -961,7 +961,7 @@ DefineRelation(CreateStmt *stmt, char relkind, Oid ownerId,
 												gettext_noop("could not convert row type"));
 			idxstmt =
 				generateClonedIndexStmt(NULL, RelationGetRelid(rel), idxRel,
-										attmap, RelationGetDescr(rel)->natts,
+										attmap, RelationGetDescr(parent)->natts,
 										&constraintOid);
 			DefineIndex(RelationGetRelid(rel),
 						idxstmt,
diff --git a/src/test/regress/expected/create_table.out b/src/test/regress/expected/create_table.out
index c25117e47c7..d20ba3dbdf5 100644
--- a/src/test/regress/expected/create_table.out
+++ b/src/test/regress/expected/create_table.out
@@ -1006,3 +1006,52 @@ CONTEXT:  SQL statement "create table tab_part_create_1 partition of tab_part_cr
 PL/pgSQL function func_part_create() line 3 at EXECUTE
 drop table tab_part_create;
 drop function func_part_create();
+-- tests of column drop with partition tables and indexes using
+-- predicates and expressions.
+create table part_column_drop (
+  useless_1 int,
+  id int,
+  useless_2 int,
+  d int,
+  b int,
+  useless_3 int
+) partition by range (id);
+alter table part_column_drop drop column useless_1;
+alter table part_column_drop drop column useless_2;
+alter table part_column_drop drop column useless_3;
+create index part_column_drop_b_pred on part_column_drop(b) where b = 1;
+create index part_column_drop_b_expr on part_column_drop((b = 1));
+create index part_column_drop_d_pred on part_column_drop(d) where d = 2;
+create index part_column_drop_d_expr on part_column_drop((d = 2));
+create table part_column_drop_1_10 partition of
+  part_column_drop for values from (1) to (10);
+\d part_column_drop
+          Table "public.part_column_drop"
+ Column |  Type   | Collation | Nullable | Default 
+--------+---------+-----------+----------+---------
+ id     | integer |           |          | 
+ d      | integer |           |          | 
+ b      | integer |           |          | 
+Partition key: RANGE (id)
+Indexes:
+    "part_column_drop_b_expr" btree ((b = 1))
+    "part_column_drop_b_pred" btree (b) WHERE b = 1
+    "part_column_drop_d_expr" btree ((d = 2))
+    "part_column_drop_d_pred" btree (d) WHERE d = 2
+Number of partitions: 1 (Use \d+ to list them.)
+
+\d part_column_drop_1_10
+       Table "public.part_column_drop_1_10"
+ Column |  Type   | Collation | Nullable | Default 
+--------+---------+-----------+----------+---------
+ id     | integer |           |          | 
+ d      | integer |           |          | 
+ b      | integer |           |          | 
+Partition of: part_column_drop FOR VALUES FROM (1) TO (10)
+Indexes:
+    "part_column_drop_1_10_b_idx" btree (b) WHERE b = 1
+    "part_column_drop_1_10_d_idx" btree (d) WHERE d = 2
+    "part_column_drop_1_10_expr_idx" btree ((b = 1))
+    "part_column_drop_1_10_expr_idx1" btree ((d = 2))
+
+drop table part_column_drop;
diff --git a/src/test/regress/sql/create_table.sql b/src/test/regress/sql/create_table.sql
index 27e6f59e87c..601a4b9dc3e 100644
--- a/src/test/regress/sql/create_table.sql
+++ b/src/test/regress/sql/create_table.sql
@@ -814,3 +814,26 @@ create trigger trig_part_create before insert on tab_part_create
 insert into tab_part_create values (1);
 drop table tab_part_create;
 drop function func_part_create();
+
+-- tests of column drop with partition tables and indexes using
+-- predicates and expressions.
+create table part_column_drop (
+  useless_1 int,
+  id int,
+  useless_2 int,
+  d int,
+  b int,
+  useless_3 int
+) partition by range (id);
+alter table part_column_drop drop column useless_1;
+alter table part_column_drop drop column useless_2;
+alter table part_column_drop drop column useless_3;
+create index part_column_drop_b_pred on part_column_drop(b) where b = 1;
+create index part_column_drop_b_expr on part_column_drop((b = 1));
+create index part_column_drop_d_pred on part_column_drop(d) where d = 2;
+create index part_column_drop_d_expr on part_column_drop((d = 2));
+create table part_column_drop_1_10 partition of
+  part_column_drop for values from (1) to (10);
+\d part_column_drop
+\d part_column_drop_1_10
+drop table part_column_drop;