Parsed test spec with 3 sessions

starting permutation: s1hold s2vacuum s3fill s1maint s1end s2check
step s1hold: BEGIN; SELECT sift._test_tbl_hold_maint('iso_tv');
_test_tbl_hold_maint
--------------------
                    
(1 row)

step s2vacuum: VACUUM iso_tv; <waiting ...>
step s3fill: INSERT INTO iso_tv SELECT 10000 + i, 2, repeat('x', 300) FROM generate_series(1, 30000) i;
step s1maint: SELECT sift._test_tbl_promote_held('iso_tv');
_test_tbl_promote_held
----------------------
                      
(1 row)

step s1end: COMMIT;
step s2vacuum: <... completed>
step s2check: SELECT v, count(*) AS versions, count(DISTINCT id) AS ids, min(id), max(id) FROM iso_tv GROUP BY v ORDER BY v;
v|versions|  ids|  min|  max
-+--------+-----+-----+-----
1|    3000| 3000|    1| 3000
2|   30000|30000|10001|40000
(2 rows)