Parsed test spec with 2 sessions

starting permutation: s1-begin s2-begin s1-master_append_table_to_shard s2-master_append_table_to_shard s1-commit s2-commit
step s1-begin:
    BEGIN;

step s2-begin:
 BEGIN;

step s1-master_append_table_to_shard:
    SELECT
     master_append_table_to_shard(shardid, 'table_to_be_appended', 'localhost', 57636)
 FROM
  pg_dist_shard
 WHERE
  'table_to_append'::regclass::oid = logicalrelid;

master_append_table_to_shard

0.0426667
step s2-master_append_table_to_shard:
    SELECT
     master_append_table_to_shard(shardid, 'table_to_be_appended', 'localhost', 57636)
 FROM
  pg_dist_shard
 WHERE
  'table_to_append'::regclass::oid = logicalrelid;
 <waiting ...>
step s1-commit:
    COMMIT;

step s2-master_append_table_to_shard: <... completed>
master_append_table_to_shard

0.064
step s2-commit:
 COMMIT;