Parsed test spec with 3 sessions

starting permutation: s2h s1begin s1build s3upd s2r s3upd2 s1commit s1begin s1build2 s3upd s1commit
step s2h: SELECT pg_advisory_lock(1003);
pg_advisory_lock
----------------
                
(1 row)

step s1begin: BEGIN;
step s1build: SET sift.test_phase_gate = 1000;
		  CREATE INDEX iso_cl_fact_c ON iso_cl_fact USING sift_col (id, dim_id, v) WITH (connect = 'dim_id -> iso_cl_dim(id)'); <waiting ...>
step s3upd: UPDATE iso_cl_dim SET category_id = category_id + 1 WHERE id = 7;
step s2r: SELECT pg_advisory_unlock(1003);
pg_advisory_unlock
------------------
t                 
(1 row)

step s1build: <... completed>
step s3upd2: UPDATE iso_cl_dim SET category_id = category_id + 1 WHERE id = 8; <waiting ...>
step s1commit: COMMIT;
step s3upd2: <... completed>
step s1begin: BEGIN;
step s1build2: CREATE INDEX iso_cl_fact_c2 ON iso_cl_fact USING sift_col (id, dim_id) WITH (connect = 'dim_id -> iso_cl_dim(id)');
step s3upd: UPDATE iso_cl_dim SET category_id = category_id + 1 WHERE id = 7;
step s1commit: COMMIT;