Parsed test spec with 3 sessions

starting permutation: s2lock s1b s1plan s1scan s3i s3p s3d s3v s2unlock s1ref s1c
step s2lock: SELECT pg_advisory_lock(20983, 5);
pg_advisory_lock
----------------
                
(1 row)

step s1b: BEGIN ISOLATION LEVEL REPEATABLE READ; SELECT count(*) > 0 AS snapshot FROM iso_par;
snapshot
--------
t       
(1 row)

step s1plan: SELECT iso_par_parallel('SELECT id FROM iso_par WHERE body @@> ''common''') AS parallel_scan;
parallel_scan
-------------
t            
(1 row)

step s1scan: SELECT count(*) AS n, sum(id) AS ids FROM iso_par WHERE body @@> 'common'; <waiting ...>
step s3i: INSERT INTO iso_par SELECT g, 'common fresh ' || g || repeat(' filler', 20), repeat('x', 1500) FROM generate_series(5001, 5600) g;
step s3p: SELECT sift.promote('iso_par_idx') >= 0 AS promoted;
promoted
--------
t       
(1 row)

step s3d: DELETE FROM iso_par WHERE id % 3 = 0;
step s3v: VACUUM iso_par;
step s2unlock: SELECT pg_advisory_unlock(20983, 5);
pg_advisory_unlock
------------------
t                 
(1 row)

step s1scan: <... completed>
   n|    ids
----+-------
3000|4501500
(1 row)

step s1ref: SELECT count(*) AS n, sum(id) AS ids FROM iso_par WHERE sift_ref.match(body, 'common');
   n|    ids
----+-------
3000|4501500
(1 row)

step s1c: COMMIT;