diff --git a/src/common/backend/utils/adt/ruleutils.cpp b/src/common/backend/utils/adt/ruleutils.cpp
index d7d5781c4..6262f3d38 100644
--- a/src/common/backend/utils/adt/ruleutils.cpp
+++ b/src/common/backend/utils/adt/ruleutils.cpp
@@ -3806,7 +3806,7 @@ static text* pg_get_expr_worker(text* expr, Oid relid, const char* relname, int
     exprstr = text_to_cstring(expr);
 
     /* Convert expression to node tree */
-    node = (Node*)stringToNode(exprstr);
+    node = (Node*)stringToNode_skip_extern_fields(exprstr);
 
     pfree_ext(exprstr);
 
diff --git a/src/test/regress/expected/create_schema.out b/src/test/regress/expected/create_schema.out
index c6bb2acce..2bb81aa76 100644
--- a/src/test/regress/expected/create_schema.out
+++ b/src/test/regress/expected/create_schema.out
@@ -1,9 +1,34 @@
 create role samedb_schema_cn_role_02_001 password 'Ttest_234';
 create schema authorization samedb_schema_cn_role_02_001
-create table samedb_schema_cn_role_02_001.cn_table_00 (cn_a int, cn_b text , cn_c date ,cn_d interval)
+create table samedb_schema_cn_role_02_001.cn_table_00 (cn_a int, cn_b text , cn_c date ,cn_d interval, cn_e serial)
 create view cn_view_00 as
 select cn_b,cn_d, cn_c from cn_table_00;
+NOTICE:  CREATE TABLE will create implicit sequence "cn_table_00_cn_e_seq" for serial column "cn_table_00.cn_e"
+\d+ samedb_schema_cn_role_02_001.cn_table_00
+                                                             Table "samedb_schema_cn_role_02_001.cn_table_00"
+ Column |              Type              |                                        Modifiers                                        | Storage  | Stats target | Description 
+--------+--------------------------------+-----------------------------------------------------------------------------------------+----------+--------------+-------------
+ cn_a   | integer                        |                                                                                         | plain    |              | 
+ cn_b   | text                           |                                                                                         | extended |              | 
+ cn_c   | timestamp(0) without time zone |                                                                                         | plain    |              | 
+ cn_d   | interval                       |                                                                                         | plain    |              | 
+ cn_e   | integer                        | not null default nextval('samedb_schema_cn_role_02_001.cn_table_00_cn_e_seq'::regclass) | plain    |              | 
+Has OIDs: no
+Options: orientation=row, compression=no
+
 alter schema samedb_schema_cn_role_02_001 rename to  samedb_schema_cn_role_02_001_bak;
+\d+ samedb_schema_cn_role_02_001_bak.cn_table_00
+                                                             Table "samedb_schema_cn_role_02_001_bak.cn_table_00"
+ Column |              Type              |                                          Modifiers                                          | Storage  | Stats target | Description 
+--------+--------------------------------+---------------------------------------------------------------------------------------------+----------+--------------+-------------
+ cn_a   | integer                        |                                                                                             | plain    |              | 
+ cn_b   | text                           |                                                                                             | extended |              | 
+ cn_c   | timestamp(0) without time zone |                                                                                             | plain    |              | 
+ cn_d   | interval                       |                                                                                             | plain    |              | 
+ cn_e   | integer                        | not null default nextval('samedb_schema_cn_role_02_001_bak.cn_table_00_cn_e_seq'::regclass) | plain    |              | 
+Has OIDs: no
+Options: orientation=row, compression=no
+
 alter view samedb_schema_cn_role_02_001_bak.cn_view_00 rename to cn_view_00_bak;
 drop view  samedb_schema_cn_role_02_001_bak.cn_view_00_bak;
 drop table samedb_schema_cn_role_02_001_bak.cn_table_00;
diff --git a/src/test/regress/sql/create_schema.sql b/src/test/regress/sql/create_schema.sql
index 7b22d8011..6c41d0c44 100644
--- a/src/test/regress/sql/create_schema.sql
+++ b/src/test/regress/sql/create_schema.sql
@@ -1,12 +1,16 @@
 create role samedb_schema_cn_role_02_001 password 'Ttest_234';
 
 create schema authorization samedb_schema_cn_role_02_001
-create table samedb_schema_cn_role_02_001.cn_table_00 (cn_a int, cn_b text , cn_c date ,cn_d interval)
+create table samedb_schema_cn_role_02_001.cn_table_00 (cn_a int, cn_b text , cn_c date ,cn_d interval, cn_e serial)
 create view cn_view_00 as
 select cn_b,cn_d, cn_c from cn_table_00;
 
+\d+ samedb_schema_cn_role_02_001.cn_table_00
+
 alter schema samedb_schema_cn_role_02_001 rename to  samedb_schema_cn_role_02_001_bak;
 
+\d+ samedb_schema_cn_role_02_001_bak.cn_table_00
+
 alter view samedb_schema_cn_role_02_001_bak.cn_view_00 rename to cn_view_00_bak;
 
 drop view  samedb_schema_cn_role_02_001_bak.cn_view_00_bak;