Fix singlenode mode isolation2 expected results not stable.

As there are three ao/aocs tables in the prevent_ao_wal isolation2 test, the
expected results of wal are not stable after VACUUM. We fix this by truncate
unrelated table in lockmodes test.

Authored-by: Zhang Wenchao zwcpostgres@gmail.com

Author: zhangwenchao-123

src/test/regress/expected/misc_sanity_external_fts.out

@@ -122,6 +122,8 @@ ORDER BY 1, 2;
  pg_resqueuecapability    | ressetting         | text
  pg_stat_last_operation   | stasubtype         | text
  pg_stat_last_shoperation | stasubtype         | text
+ pg_tag                   | allowed_values     | text[]
+ pg_tag_description       | tagvalue           | text
  pg_task                  | command            | text
  pg_task                  | database           | text
  pg_task                  | jobname            | text
@@ -133,7 +135,7 @@ ORDER BY 1, 2;
  pg_task_run_history      | return_message     | text
  pg_task_run_history      | status             | text
  pg_task_run_history      | username           | text
-(31 rows)
+(33 rows)
 
 -- system catalogs without primary keys
 --

src/test/singlenode_isolation2/expected/lockmodes.out

@@ -1089,3 +1089,6 @@ UPDATE 1
 1: ROLLBACK;
 ROLLBACK
 1q: ... <quitting>
+
+TRUNCATE t_lockmods_ao;
+TRUNCATE

src/test/singlenode_isolation2/expected/prevent_ao_wal.out

@@ -75,7 +75,6 @@ rmgr: Appendonly  len (rec/tot):    146/   146, tx:      12664, lsn: 0/F8000B38,
 rmgr: Appendonly  len (rec/tot):     58/    58, tx:      12665, lsn: 0/F8000C98, prev 0/F8000C68, desc: APPENDONLY_TRUNCATE truncate: rel 1663/221728/180472 seg/offset:0/0
 rmgr: Appendonly  len (rec/tot):     58/    58, tx:          0, lsn: 0/F80412F8, prev 0/F80412C8, desc: APPENDONLY_TRUNCATE truncate: rel 1663/221728/180476 seg/offset:0/80
 rmgr: Appendonly  len (rec/tot):     58/    58, tx:          0, lsn: 0/F8041338, prev 0/F80412F8, desc: APPENDONLY_TRUNCATE truncate: rel 1663/221728/180476 seg/offset:128/80
-rmgr: Appendonly  len (rec/tot):     58/    58, tx:          0, lsn: 0/F80D2020, prev 0/F80D1FF0, desc: APPENDONLY_TRUNCATE truncate: rel 1663/221728/180445 seg/offset:0/112
 rmgr: Appendonly  len (rec/tot):     58/    58, tx:          0, lsn: 0/F8307118, prev 0/F83070E8, desc: APPENDONLY_TRUNCATE truncate: rel 1663/221728/180472 seg/offset:1/88
 rmgr: Appendonly  len (rec/tot):     58/    58, tx:          0, lsn: 0/F8307158, prev 0/F8307118, desc: APPENDONLY_TRUNCATE truncate: rel 1663/221728/180472 seg/offset:0/0
 rmgr: Appendonly  len (rec/tot):     58/    58, tx:          0, lsn: 0/F8307208, prev 0/F83071D8, desc: APPENDONLY_TRUNCATE truncate: rel 1663/221728/180476 seg/offset:0/80
@@ -86,7 +85,6 @@ rmgr: Appendonly  len (rec/tot):    122/   122, tx:      12673, lsn: 0/F83075A0,
 rmgr: Appendonly  len (rec/tot):    122/   122, tx:      12673, lsn: 0/F8307620, prev 0/F83075A0, desc: APPENDONLY_INSERT insert: rel 1663/221728/180476 seg/offset:129/0 len:64
 rmgr: Appendonly  len (rec/tot):     58/    58, tx:      12674, lsn: 0/F8307780, prev 0/F8307750, desc: APPENDONLY_TRUNCATE truncate: rel 1663/221728/180476 seg/offset:0/0
 rmgr: Appendonly  len (rec/tot):     58/    58, tx:      12674, lsn: 0/F83077C0, prev 0/F8307780, desc: APPENDONLY_TRUNCATE truncate: rel 1663/221728/180476 seg/offset:128/0
-rmgr: Appendonly  len (rec/tot):     58/    58, tx:          0, lsn: 0/F8327BF0, prev 0/F8327BC0, desc: APPENDONLY_TRUNCATE truncate: rel 1663/221728/180445 seg/offset:0/112
 
 
 -- *********** Set wal_level=minimal **************

src/test/singlenode_isolation2/sql/lockmodes.sql

@@ -381,3 +381,5 @@ create table t_lockmods_ao1 (c int) with (appendonly=true);
 1: select * from show_locks_lockmodes;
 1: ROLLBACK;
 1q:
+
+TRUNCATE t_lockmods_ao;