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Parsed test spec with 2 sessions

starting permutation: s1_begin s1_update s2_store_chunk_ids s2_cluster s1_commit s2_verify_chunk_ids
step s1_begin: BEGIN;
step s1_update: UPDATE cluster_toast_value SET flag = 1 WHERE TRUE;
step s2_store_chunk_ids: 
  CREATE TABLE cluster_chunk_id AS
    SELECT c.id, pg_column_toast_chunk_id(c.value) AS chunk_id
    FROM cluster_toast_value c;
  SELECT count(*) FROM cluster_chunk_id;

count
-----
    1
(1 row)

step s2_cluster: CLUSTER cluster_toast_value; <waiting ...>
step s1_commit: COMMIT;
step s2_cluster: <... completed>
step s2_verify_chunk_ids: 
  SELECT o.id AS chunk_ids_preserved
    FROM cluster_chunk_id o
    JOIN cluster_toast_value c ON o.id = c.id
    WHERE o.chunk_id != pg_column_toast_chunk_id(c.value);

chunk_ids_preserved
-------------------
(0 rows)