Parsed test spec with 2 sessions

starting permutation: t_prep w_begin w_delete t_held w_commit t_free
step t_prep: SET pgcolumnar.enable_end_truncation = on; SELECT pgcolumnar.compact('iso');
compact
-------
      1
(1 row)

step w_begin: BEGIN;
step w_delete: DELETE FROM iso WHERE id = 1;
step t_held: SELECT (pgcolumnar.truncate('iso') > 0) AS reclaimed;
reclaimed
---------
f        
(1 row)

step w_commit: COMMIT;
step t_free: SELECT (pgcolumnar.truncate('iso') > 0) AS reclaimed;
reclaimed
---------
t        
(1 row)