diff -U3 /tmp/cirrus-ci-build/src/test/regress/expected/indexing.out /tmp/cirrus-ci-build/src/bin/pg_upgrade/tmp_check/results/indexing.out
--- /tmp/cirrus-ci-build/src/test/regress/expected/indexing.out	2024-09-20 21:34:06.340071454 +0000
+++ /tmp/cirrus-ci-build/src/bin/pg_upgrade/tmp_check/results/indexing.out	2024-09-20 21:42:06.591586722 +0000
@@ -1277,7 +1277,7 @@
 alter table idxpart0 add unique (a);
 alter table idxpart attach partition idxpart0 default;
 alter table only idxpart add primary key (a);  -- fail, no not-null constraint
-ERROR:  column a of table idxpart0 is not marked not null
+ERROR:  column "a" of table "idxpart0" is not marked NOT NULL
 alter table idxpart0 alter column a set not null;
 alter table only idxpart add primary key (a);  -- now it works
 alter index idxpart_pkey attach partition idxpart0_a_key;