diff -U3 /Users/admin/pgsql/src/test/regress/expected/partition_info.out /Users/admin/pgsql/build/testrun/pg_upgrade/002_pg_upgrade/data/results/partition_info.out
--- /Users/admin/pgsql/src/test/regress/expected/partition_info.out	2025-12-13 16:11:08
+++ /Users/admin/pgsql/build/testrun/pg_upgrade/002_pg_upgrade/data/results/partition_info.out	2025-12-13 16:14:23
@@ -352,7 +352,14 @@
 -- Test about selection of arbiter indexes for partitioned tables with
 -- non-valid index on the parent table
 CREATE TABLE pt (a int PRIMARY KEY) PARTITION BY RANGE (a);
+ERROR:  relation "pt" already exists
 CREATE TABLE p1 PARTITION OF pt FOR VALUES FROM (1) to (2) PARTITION BY RANGE (a);
+ERROR:  Inheriting from a table with a PERIOD is not supported
 CREATE TABLE p1_1 PARTITION OF p1 FOR VALUES FROM (1) TO (2);
+ERROR:  relation "p1" does not exist
 CREATE UNIQUE INDEX ON ONLY p1 (a);
+ERROR:  relation "p1" does not exist
 INSERT INTO p1 VALUES (1) ON CONFLICT (a) DO NOTHING;
+ERROR:  relation "p1" does not exist
+LINE 1: INSERT INTO p1 VALUES (1) ON CONFLICT (a) DO NOTHING;
+                    ^