diff -U3 /tmp/cirrus-ci-build/src/test/regress/expected/indexing.out /tmp/cirrus-ci-build/src/test/modules/test_plan_advice/tmp_check/results/indexing.out
--- /tmp/cirrus-ci-build/src/test/regress/expected/indexing.out	2026-04-23 01:21:03.327610945 +0000
+++ /tmp/cirrus-ci-build/src/test/modules/test_plan_advice/tmp_check/results/indexing.out	2026-04-23 01:34:27.845239664 +0000
@@ -559,13 +559,14 @@
 ERROR:  division by zero
 select relname, indisvalid from pg_class join pg_index on indexrelid = oid
    where relname like 'idxpart%' order by relname;
-      relname       | indisvalid 
---------------------+------------
- idxpart11_expr_idx | f
- idxpart1_expr_idx  | f
- idxpart2_expr_idx  | t
- idxpart_expr_idx   | f
-(4 rows)
+         relname          | indisvalid 
+--------------------------+------------
+ idxpart11_expr_idx       | f
+ idxpart11_expr_idx_ccaux | f
+ idxpart1_expr_idx        | f
+ idxpart2_expr_idx        | t
+ idxpart_expr_idx         | f
+(5 rows)
 
 -- attach the indexes; parents stay invalid
 alter index idxpart1_expr_idx attach partition idxpart11_expr_idx;
@@ -573,13 +574,14 @@
 alter index idxpart_expr_idx attach partition idxpart2_expr_idx;
 select relname, indisvalid from pg_class join pg_index on indexrelid = oid
    where relname like 'idxpart%' order by relname;
-      relname       | indisvalid 
---------------------+------------
- idxpart11_expr_idx | f
- idxpart1_expr_idx  | f
- idxpart2_expr_idx  | t
- idxpart_expr_idx   | f
-(4 rows)
+         relname          | indisvalid 
+--------------------------+------------
+ idxpart11_expr_idx       | f
+ idxpart11_expr_idx_ccaux | f
+ idxpart1_expr_idx        | f
+ idxpart2_expr_idx        | t
+ idxpart_expr_idx         | f
+(5 rows)
 
 -- fix the index on the leaf partition
 delete from idxpart11 where b = 0;
@@ -612,24 +614,28 @@
 ERROR:  division by zero
 select relname, indisvalid from pg_class join pg_index on indexrelid = oid
    where relname like 'idxpart%' order by relname;
-      relname      | indisvalid 
--------------------+------------
- idxpart1_expr_idx | f
- idxpart2_expr_idx | f
- idxpart_expr_idx  | f
-(3 rows)
+         relname         | indisvalid 
+-------------------------+------------
+ idxpart1_expr_idx       | f
+ idxpart1_expr_idx_ccaux | f
+ idxpart2_expr_idx       | f
+ idxpart2_expr_idx_ccaux | f
+ idxpart_expr_idx        | f
+(5 rows)
 
 -- attach both; parent stays invalid
 alter index idxpart_expr_idx attach partition idxpart1_expr_idx;
 alter index idxpart_expr_idx attach partition idxpart2_expr_idx;
 select relname, indisvalid from pg_class join pg_index on indexrelid = oid
    where relname like 'idxpart%' order by relname;
-      relname      | indisvalid 
--------------------+------------
- idxpart1_expr_idx | f
- idxpart2_expr_idx | f
- idxpart_expr_idx  | f
-(3 rows)
+         relname         | indisvalid 
+-------------------------+------------
+ idxpart1_expr_idx       | f
+ idxpart1_expr_idx_ccaux | f
+ idxpart2_expr_idx       | f
+ idxpart2_expr_idx_ccaux | f
+ idxpart_expr_idx        | f
+(5 rows)
 
 -- fix only idxpart1's index, leave idxpart2's still invalid
 delete from idxpart1 where b = 0;
@@ -638,12 +644,13 @@
 alter index idxpart_expr_idx attach partition idxpart1_expr_idx;
 select relname, indisvalid from pg_class join pg_index on indexrelid = oid
    where relname like 'idxpart%' order by relname;
-      relname      | indisvalid 
--------------------+------------
- idxpart1_expr_idx | t
- idxpart2_expr_idx | f
- idxpart_expr_idx  | f
-(3 rows)
+         relname         | indisvalid 
+-------------------------+------------
+ idxpart1_expr_idx       | t
+ idxpart2_expr_idx       | f
+ idxpart2_expr_idx_ccaux | f
+ idxpart_expr_idx        | f
+(4 rows)
 
 drop table idxpart;
 -- verify dependency handling during ALTER TABLE DETACH PARTITION