Parsed test spec with 2 sessions

starting permutation: w_delete r_begin r_read1 w_compact w_trunc_held r_read2 r_commit w_trunc_free
step w_delete: SET pgcolumnar.enable_end_truncation = on; DELETE FROM iso WHERE id > 2000;
step r_begin: BEGIN ISOLATION LEVEL REPEATABLE READ;
step r_read1: SELECT count(*) FROM iso;
count
-----
 2000
(1 row)

step w_compact: SELECT pgcolumnar.compact('iso');
compact
-------
      1
(1 row)

step w_trunc_held: SELECT (pgcolumnar.truncate('iso') > 0) AS reclaimed;
reclaimed
---------
f        
(1 row)

step r_read2: SELECT count(*) FROM iso;
count
-----
 2000
(1 row)

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