diff --git a/src/test/isolation/expected/detach-partition-concurrently-3.out b/src/test/isolation/expected/detach-partition-concurrently-3.out
index 96ee090d53..3f553711b3 100644
--- a/src/test/isolation/expected/detach-partition-concurrently-3.out
+++ b/src/test/isolation/expected/detach-partition-concurrently-3.out
@@ -9,7 +9,7 @@ a
 1              
 step s2detach: ALTER TABLE d3_listp DETACH PARTITION d3_listp1 CONCURRENTLY; <waiting ...>
 step s1cancel: SELECT pg_cancel_backend(pid), pg_sleep(0.1) FROM d3_pid;
-pg_cancel_backendpg_sleep       
+pg_cancel_backend pg_sleep       
 
 t                             
 step s2detach: <... completed>
@@ -35,7 +35,7 @@ a
 1              
 step s2detach: ALTER TABLE d3_listp DETACH PARTITION d3_listp1 CONCURRENTLY; <waiting ...>
 step s1cancel: SELECT pg_cancel_backend(pid), pg_sleep(0.1) FROM d3_pid;
-pg_cancel_backendpg_sleep       
+pg_cancel_backend pg_sleep       
 
 t                             
 step s2detach: <... completed>
@@ -54,7 +54,7 @@ a
 1              
 step s2detach: ALTER TABLE d3_listp DETACH PARTITION d3_listp1 CONCURRENTLY; <waiting ...>
 step s1cancel: SELECT pg_cancel_backend(pid), pg_sleep(0.1) FROM d3_pid;
-pg_cancel_backendpg_sleep       
+pg_cancel_backend pg_sleep       
 
 t                             
 step s2detach: <... completed>
@@ -77,7 +77,7 @@ a
 1              
 step s2detach: ALTER TABLE d3_listp DETACH PARTITION d3_listp1 CONCURRENTLY; <waiting ...>
 step s1cancel: SELECT pg_cancel_backend(pid), pg_sleep(0.1) FROM d3_pid;
-pg_cancel_backendpg_sleep       
+pg_cancel_backend pg_sleep       
 
 t                             
 step s2detach: <... completed>
@@ -95,7 +95,7 @@ a
 1              
 step s2detach2: ALTER TABLE d3_listp DETACH PARTITION d3_listp2 CONCURRENTLY; <waiting ...>
 step s1cancel: SELECT pg_cancel_backend(pid), pg_sleep(0.1) FROM d3_pid;
-pg_cancel_backendpg_sleep       
+pg_cancel_backend pg_sleep       
 
 t                             
 step s2detach2: <... completed>
@@ -121,7 +121,7 @@ a
 1              
 step s2detach2: ALTER TABLE d3_listp DETACH PARTITION d3_listp2 CONCURRENTLY; <waiting ...>
 step s1cancel: SELECT pg_cancel_backend(pid), pg_sleep(0.1) FROM d3_pid;
-pg_cancel_backendpg_sleep       
+pg_cancel_backend pg_sleep       
 
 t                             
 step s2detach2: <... completed>
@@ -150,7 +150,7 @@ a
 1              
 step s2detach: ALTER TABLE d3_listp DETACH PARTITION d3_listp1 CONCURRENTLY; <waiting ...>
 step s1cancel: SELECT pg_cancel_backend(pid), pg_sleep(0.1) FROM d3_pid;
-pg_cancel_backendpg_sleep       
+pg_cancel_backend pg_sleep       
 
 t                             
 step s2detach: <... completed>
@@ -172,7 +172,7 @@ a
 1              
 step s2detach: ALTER TABLE d3_listp DETACH PARTITION d3_listp1 CONCURRENTLY; <waiting ...>
 step s1cancel: SELECT pg_cancel_backend(pid), pg_sleep(0.1) FROM d3_pid;
-pg_cancel_backendpg_sleep       
+pg_cancel_backend pg_sleep       
 
 t                             
 step s2detach: <... completed>
@@ -194,7 +194,7 @@ a
 1              
 step s2detach: ALTER TABLE d3_listp DETACH PARTITION d3_listp1 CONCURRENTLY; <waiting ...>
 step s1cancel: SELECT pg_cancel_backend(pid), pg_sleep(0.1) FROM d3_pid;
-pg_cancel_backendpg_sleep       
+pg_cancel_backend pg_sleep       
 
 t                             
 step s2detach: <... completed>
@@ -213,7 +213,7 @@ a
 1              
 step s2detach: ALTER TABLE d3_listp DETACH PARTITION d3_listp1 CONCURRENTLY; <waiting ...>
 step s1cancel: SELECT pg_cancel_backend(pid), pg_sleep(0.1) FROM d3_pid;
-pg_cancel_backendpg_sleep       
+pg_cancel_backend pg_sleep       
 
 t                             
 step s2detach: <... completed>
@@ -233,7 +233,7 @@ a
 1              
 step s2detach: ALTER TABLE d3_listp DETACH PARTITION d3_listp1 CONCURRENTLY; <waiting ...>
 step s1cancel: SELECT pg_cancel_backend(pid), pg_sleep(0.1) FROM d3_pid;
-pg_cancel_backendpg_sleep       
+pg_cancel_backend pg_sleep       
 
 t                             
 step s2detach: <... completed>
@@ -252,7 +252,7 @@ a
 1              
 step s2detach: ALTER TABLE d3_listp DETACH PARTITION d3_listp1 CONCURRENTLY; <waiting ...>
 step s1cancel: SELECT pg_cancel_backend(pid), pg_sleep(0.1) FROM d3_pid;
-pg_cancel_backendpg_sleep       
+pg_cancel_backend pg_sleep       
 
 t                             
 step s2detach: <... completed>
@@ -276,7 +276,7 @@ a
 1              
 step s2detach: ALTER TABLE d3_listp DETACH PARTITION d3_listp1 CONCURRENTLY; <waiting ...>
 step s1cancel: SELECT pg_cancel_backend(pid), pg_sleep(0.1) FROM d3_pid;
-pg_cancel_backendpg_sleep       
+pg_cancel_backend pg_sleep       
 
 t                             
 step s2detach: <... completed>
@@ -301,7 +301,7 @@ a
 1              
 step s2detach: ALTER TABLE d3_listp DETACH PARTITION d3_listp1 CONCURRENTLY; <waiting ...>
 step s1cancel: SELECT pg_cancel_backend(pid), pg_sleep(0.1) FROM d3_pid;
-pg_cancel_backendpg_sleep       
+pg_cancel_backend pg_sleep       
 
 t                             
 step s2detach: <... completed>
@@ -324,7 +324,7 @@ a
 1              
 step s2detach: ALTER TABLE d3_listp DETACH PARTITION d3_listp1 CONCURRENTLY; <waiting ...>
 step s1cancel: SELECT pg_cancel_backend(pid), pg_sleep(0.1) FROM d3_pid;
-pg_cancel_backendpg_sleep       
+pg_cancel_backend pg_sleep       
 
 t                             
 step s2detach: <... completed>
@@ -349,7 +349,7 @@ a
 1              
 step s2detach: ALTER TABLE d3_listp DETACH PARTITION d3_listp1 CONCURRENTLY; <waiting ...>
 step s1cancel: SELECT pg_cancel_backend(pid), pg_sleep(0.1) FROM d3_pid;
-pg_cancel_backendpg_sleep       
+pg_cancel_backend pg_sleep       
 
 t                             
 step s2detach: <... completed>
@@ -369,7 +369,7 @@ a
 1              
 step s2detach: ALTER TABLE d3_listp DETACH PARTITION d3_listp1 CONCURRENTLY; <waiting ...>
 step s1cancel: SELECT pg_cancel_backend(pid), pg_sleep(0.1) FROM d3_pid;
-pg_cancel_backendpg_sleep       
+pg_cancel_backend pg_sleep       
 
 t                             
 step s2detach: <... completed>
@@ -394,7 +394,7 @@ a
 1              
 step s2detach: ALTER TABLE d3_listp DETACH PARTITION d3_listp1 CONCURRENTLY; <waiting ...>
 step s1cancel: SELECT pg_cancel_backend(pid), pg_sleep(0.1) FROM d3_pid;
-pg_cancel_backendpg_sleep       
+pg_cancel_backend pg_sleep       
 
 t                             
 step s2detach: <... completed>
diff --git a/src/test/isolation/expected/detach-partition-concurrently-4.out b/src/test/isolation/expected/detach-partition-concurrently-4.out
index e5dc40d076..33ea6eccf6 100644
--- a/src/test/isolation/expected/detach-partition-concurrently-4.out
+++ b/src/test/isolation/expected/detach-partition-concurrently-4.out
@@ -10,7 +10,7 @@ a
 2              
 step s2detach: alter table d4_primary detach partition d4_primary1 concurrently; <waiting ...>
 step s1cancel: select pg_cancel_backend(pid), pg_sleep(0.1) from d4_pid;
-pg_cancel_backendpg_sleep       
+pg_cancel_backend pg_sleep       
 
 t                             
 step s2detach: <... completed>
@@ -44,7 +44,7 @@ a
 2              
 step s2detach: alter table d4_primary detach partition d4_primary1 concurrently; <waiting ...>
 step s1cancel: select pg_cancel_backend(pid), pg_sleep(0.1) from d4_pid;
-pg_cancel_backendpg_sleep       
+pg_cancel_backend pg_sleep       
 
 t                             
 step s2detach: <... completed>
@@ -74,7 +74,7 @@ step s1b: begin;
 step s1declare: declare f cursor for select * from d4_primary;
 step s2detach: alter table d4_primary detach partition d4_primary1 concurrently; <waiting ...>
 step s1cancel: select pg_cancel_backend(pid), pg_sleep(0.1) from d4_pid;
-pg_cancel_backendpg_sleep       
+pg_cancel_backend pg_sleep       
 
 t                             
 step s2detach: <... completed>
@@ -110,7 +110,7 @@ step s1b: begin;
 step s1declare: declare f cursor for select * from d4_primary;
 step s2detach: alter table d4_primary detach partition d4_primary1 concurrently; <waiting ...>
 step s1cancel: select pg_cancel_backend(pid), pg_sleep(0.1) from d4_pid;
-pg_cancel_backendpg_sleep       
+pg_cancel_backend pg_sleep       
 
 t                             
 step s2detach: <... completed>
@@ -150,7 +150,7 @@ step s1b: begin;
 step s2detach: alter table d4_primary detach partition d4_primary1 concurrently;
 step s1declare: declare f cursor for select * from d4_primary;
 step s1cancel: select pg_cancel_backend(pid), pg_sleep(0.1) from d4_pid;
-pg_cancel_backendpg_sleep       
+pg_cancel_backend pg_sleep       
 
 t                             
 step s2noop: UNLISTEN noop;
@@ -181,7 +181,7 @@ step s1b: begin;
 step s2detach: alter table d4_primary detach partition d4_primary1 concurrently;
 step s1declare: declare f cursor for select * from d4_primary;
 step s1cancel: select pg_cancel_backend(pid), pg_sleep(0.1) from d4_pid;
-pg_cancel_backendpg_sleep       
+pg_cancel_backend pg_sleep       
 
 t                             
 step s2noop: UNLISTEN noop;
@@ -220,7 +220,7 @@ a
 2              
 step s2detach: alter table d4_primary detach partition d4_primary1 concurrently; <waiting ...>
 step s1cancel: select pg_cancel_backend(pid), pg_sleep(0.1) from d4_pid;
-pg_cancel_backendpg_sleep       
+pg_cancel_backend pg_sleep       
 
 t                             
 step s2detach: <... completed>
@@ -286,7 +286,7 @@ step s3insert: insert into d4_fk values (1);
 ERROR:  insert or update on table "d4_fk" violates foreign key constraint "d4_fk_a_fkey"
 step s3commit: commit;
 step s1cancel: select pg_cancel_backend(pid), pg_sleep(0.1) from d4_pid;
-pg_cancel_backendpg_sleep       
+pg_cancel_backend pg_sleep       
 
 t                             
 step s2detach: <... completed>
@@ -320,7 +320,7 @@ a
 2              
 step s2detach: alter table d4_primary detach partition d4_primary1 concurrently; <waiting ...>
 step s1cancel: select pg_cancel_backend(pid), pg_sleep(0.1) from d4_pid;
-pg_cancel_backendpg_sleep       
+pg_cancel_backend pg_sleep       
 
 t                             
 step s2detach: <... completed>
@@ -346,7 +346,7 @@ a
 2              
 step s2detach: alter table d4_primary detach partition d4_primary1 concurrently; <waiting ...>
 step s1cancel: select pg_cancel_backend(pid), pg_sleep(0.1) from d4_pid;
-pg_cancel_backendpg_sleep       
+pg_cancel_backend pg_sleep       
 
 t                             
 step s2detach: <... completed>
diff --git a/src/test/isolation/expected/insert-conflict-specconflict.out b/src/test/isolation/expected/insert-conflict-specconflict.out
index ae361fbd03..8f2bc9d562 100644
--- a/src/test/isolation/expected/insert-conflict-specconflict.out
+++ b/src/test/isolation/expected/insert-conflict-specconflict.out
@@ -2,7 +2,7 @@ Parsed test spec with 3 sessions
 
 starting permutation: controller_locks controller_show s1_upsert s2_upsert controller_show controller_unlock_1_1 controller_unlock_2_1 controller_unlock_1_3 controller_unlock_2_3 controller_show controller_unlock_2_2 controller_show controller_unlock_1_2 controller_show
 step controller_locks: SELECT pg_advisory_lock(sess, lock), sess, lock FROM generate_series(1, 2) a(sess), generate_series(1,3) b(lock);
-pg_advisory_locksess           lock           
+pg_advisory_lock sess           lock           
 
                1              1              
                1              2              
@@ -70,7 +70,7 @@ k1             inserted s2 with conflict update s1
 
 starting permutation: controller_locks controller_show s1_upsert s2_upsert controller_show controller_unlock_1_1 controller_unlock_2_1 controller_unlock_1_3 controller_unlock_2_3 controller_show controller_unlock_1_2 controller_show controller_unlock_2_2 controller_show
 step controller_locks: SELECT pg_advisory_lock(sess, lock), sess, lock FROM generate_series(1, 2) a(sess), generate_series(1,3) b(lock);
-pg_advisory_locksess           lock           
+pg_advisory_lock sess           lock           
 
                1              1              
                1              2              
@@ -138,7 +138,7 @@ k1             inserted s1 with conflict update s2
 
 starting permutation: controller_locks controller_show s1_insert_toast s2_insert_toast controller_show controller_unlock_1_1 controller_unlock_2_1 controller_unlock_1_3 controller_unlock_2_3 controller_show controller_unlock_1_2 controller_show_count controller_unlock_2_2 controller_show_count
 step controller_locks: SELECT pg_advisory_lock(sess, lock), sess, lock FROM generate_series(1, 2) a(sess), generate_series(1,3) b(lock);
-pg_advisory_locksess           lock           
+pg_advisory_lock sess           lock           
 
                1              1              
                1              2              
@@ -206,7 +206,7 @@ count
 
 starting permutation: controller_locks controller_show s1_begin s2_begin s1_upsert s2_upsert controller_show controller_unlock_1_1 controller_unlock_2_1 controller_unlock_1_3 controller_unlock_2_3 controller_show controller_unlock_1_2 controller_show controller_unlock_2_2 controller_show s1_commit controller_show s2_commit controller_show
 step controller_locks: SELECT pg_advisory_lock(sess, lock), sess, lock FROM generate_series(1, 2) a(sess), generate_series(1,3) b(lock);
-pg_advisory_locksess           lock           
+pg_advisory_lock sess           lock           
 
                1              1              
                1              2              
@@ -291,7 +291,7 @@ step s1_confirm_index_order: SELECT 'upserttest_key_uniq_idx'::regclass::int8 <
 
 t              
 step controller_locks: SELECT pg_advisory_lock(sess, lock), sess, lock FROM generate_series(1, 2) a(sess), generate_series(1,3) b(lock);
-pg_advisory_locksess           lock           
+pg_advisory_lock sess           lock           
 
                1              1              
                1              2              
@@ -367,12 +367,12 @@ step controller_print_speculative_locks:
         AND pa.application_name LIKE 'isolation/insert-conflict-specconflict-s%'
     ORDER BY 1, 2, 3, 4;
 
-application_namelocktype       mode           granted        
+application_name locktype       mode           granted        
 
-isolation/insert-conflict-specconflict-s1spectoken      ShareLock      f              
-isolation/insert-conflict-specconflict-s1transactionid  ExclusiveLock  t              
-isolation/insert-conflict-specconflict-s2spectoken      ExclusiveLock  t              
-isolation/insert-conflict-specconflict-s2transactionid  ExclusiveLock  t              
+isolation/insert-conflict-specconflict-s1 spectoken      ShareLock      f              
+isolation/insert-conflict-specconflict-s1 transactionid  ExclusiveLock  t              
+isolation/insert-conflict-specconflict-s2 spectoken      ExclusiveLock  t              
+isolation/insert-conflict-specconflict-s2 transactionid  ExclusiveLock  t              
 step controller_unlock_2_4: SELECT pg_advisory_unlock(2, 4);
 pg_advisory_unlock
 
@@ -389,11 +389,11 @@ step controller_print_speculative_locks:
         AND pa.application_name LIKE 'isolation/insert-conflict-specconflict-s%'
     ORDER BY 1, 2, 3, 4;
 
-application_namelocktype       mode           granted        
+application_name locktype       mode           granted        
 
-isolation/insert-conflict-specconflict-s1transactionid  ExclusiveLock  t              
-isolation/insert-conflict-specconflict-s1transactionid  ShareLock      f              
-isolation/insert-conflict-specconflict-s2transactionid  ExclusiveLock  t              
+isolation/insert-conflict-specconflict-s1 transactionid  ExclusiveLock  t              
+isolation/insert-conflict-specconflict-s1 transactionid  ShareLock      f              
+isolation/insert-conflict-specconflict-s2 transactionid  ExclusiveLock  t              
 step s2_commit: COMMIT;
 s1: NOTICE:  blurt_and_lock_123() called for k1 in session 1
 s1: NOTICE:  acquiring advisory lock on 2
@@ -411,5 +411,5 @@ step controller_print_speculative_locks:
         AND pa.application_name LIKE 'isolation/insert-conflict-specconflict-s%'
     ORDER BY 1, 2, 3, 4;
 
-application_namelocktype       mode           granted        
+application_name locktype       mode           granted        
 
diff --git a/src/test/isolation/expected/partition-concurrent-attach.out b/src/test/isolation/expected/partition-concurrent-attach.out
index 17fac39989..764ce04e03 100644
--- a/src/test/isolation/expected/partition-concurrent-attach.out
+++ b/src/test/isolation/expected/partition-concurrent-attach.out
@@ -44,6 +44,6 @@ step s1c: commit;
 step s2s: select tableoid::regclass, * from tpart;
 tableoid       i              j              
 
-tpart_default_default110            xxx            
-tpart_default_default120            yyy            
-tpart_default_default150            zzz            
+tpart_default_default 110            xxx            
+tpart_default_default 120            yyy            
+tpart_default_default 150            zzz            
diff --git a/src/test/isolation/expected/tuplelock-update.out b/src/test/isolation/expected/tuplelock-update.out
index ea63022e93..e153f7a8d6 100644
--- a/src/test/isolation/expected/tuplelock-update.out
+++ b/src/test/isolation/expected/tuplelock-update.out
@@ -6,7 +6,7 @@ step s1_advlock:
         pg_advisory_lock(285714),
         pg_advisory_lock(571428);
 
-pg_advisory_lockpg_advisory_lockpg_advisory_lock
+pg_advisory_lock pg_advisory_lock pg_advisory_lock
 
                                              
 step s2_update: UPDATE pktab SET data = DEFAULT WHERE pg_advisory_lock_shared(142857) IS NOT NULL; <waiting ...>
diff --git a/src/test/isolation/isolationtester.c b/src/test/isolation/isolationtester.c
index 0a73d38dae..fe9acb1143 100644
--- a/src/test/isolation/isolationtester.c
+++ b/src/test/isolation/isolationtester.c
@@ -920,14 +920,26 @@ printResultSet(PGresult *res)
 	/* first, print out the attribute names */
 	nFields = PQnfields(res);
 	for (i = 0; i < nFields; i++)
-		printf("%-15s", PQfname(res, i));
+	{
+		const char *itm = PQfname(res, i);
+
+		printf("%-15s", itm);
+		if (i < nFields - 1 && strlen(itm) >= 15)
+			printf(" ");
+	}
 	printf("\n\n");
 
 	/* next, print out the rows */
 	for (i = 0; i < PQntuples(res); i++)
 	{
 		for (j = 0; j < nFields; j++)
-			printf("%-15s", PQgetvalue(res, i, j));
+		{
+			const char *itm = PQgetvalue(res, i, j);
+
+			printf("%-15s", itm);
+			if (j < nFields - 1 && strlen(itm) >= 15)
+				printf(" ");
+		}
 		printf("\n");
 	}
 }
