Parsed test spec with 2 sessions

starting permutation: s1r s2r1 s1c s2r2 s2c
step s1r: SELECT * FROM foo;
 a
--
 1
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 9
10
(10 rows)

step s2r1: SELECT * FROM foo;
 a
--
 1
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10
(10 rows)

step s1c: COMMIT;
step s2r2: SELECT * FROM foo;
 a
--
 1
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 3
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 5
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10
(10 rows)

step s2c: COMMIT;