diff -U3 /Users/admin/pgsql/src/test/regress/expected/incremental_matview.out /Users/admin/pgsql/build/testrun/regress/regress/results/incremental_matview.out
--- /Users/admin/pgsql/src/test/regress/expected/incremental_matview.out	2024-04-12 20:53:08
+++ /Users/admin/pgsql/build/testrun/regress/regress/results/incremental_matview.out	2024-04-12 20:55:46
@@ -666,24 +666,14 @@
 CREATE TABLE base_t (i int, v int);
 INSERT INTO base_t VALUES (1,10),(2, NULL);
 CREATE INCREMENTAL MATERIALIZED VIEW mv AS SELECT * FROM base_t;
-NOTICE:  could not create an index on materialized view "mv" automatically
-DETAIL:  This target list does not have all the primary key columns, or this view does not contain GROUP BY or DISTINCT clause.
-HINT:  Create an index on the materialized view for efficient incremental maintenance.
+ERROR:  duplicate key value violates unique constraint "pg_type_typname_nsp_index"
+DETAIL:  Key (typname, typnamespace)=(mv, 2200) already exists.
 SELECT * FROM mv ORDER BY i;
- i | v  
----+----
- 1 | 10
- 2 |   
-(2 rows)
-
+ERROR:  current transaction is aborted, commands ignored until end of transaction block
 UPDATE base_t SET v = 20 WHERE i = 2;
+ERROR:  current transaction is aborted, commands ignored until end of transaction block
 SELECT * FROM mv ORDER BY i;
- i | v  
----+----
- 1 | 10
- 2 | 20
-(2 rows)
-
+ERROR:  current transaction is aborted, commands ignored until end of transaction block
 ROLLBACK;
 BEGIN;
 CREATE TABLE base_t (i int);