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43 lines
1.7 KiB
Python
43 lines
1.7 KiB
Python
from fixtures.neon_fixtures import NeonEnv, fork_at_current_lsn
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from fixtures.pg_version import PgVersion
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#
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# Test UNLOGGED tables/relations. Postgres copies init fork contents to main
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# fork to reset them during recovery. In Neon, pageserver directly sends init
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# fork contents as main fork during basebackup.
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#
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def test_unlogged(neon_simple_env: NeonEnv):
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env = neon_simple_env
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env.neon_cli.create_branch("test_unlogged", "empty")
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endpoint = env.endpoints.create_start("test_unlogged")
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conn = endpoint.connect()
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cur = conn.cursor()
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cur.execute("CREATE UNLOGGED TABLE iut (id int);")
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# create index to test unlogged index relation as well
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cur.execute("CREATE UNIQUE INDEX iut_idx ON iut (id);")
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cur.execute("ALTER TABLE iut ADD COLUMN seq int GENERATED ALWAYS AS IDENTITY;")
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cur.execute("INSERT INTO iut (id) values (42);")
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# create another compute to fetch inital empty contents from pageserver
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fork_at_current_lsn(env, endpoint, "test_unlogged_basebackup", "test_unlogged")
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endpoint2 = env.endpoints.create_start("test_unlogged_basebackup")
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conn2 = endpoint2.connect()
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cur2 = conn2.cursor()
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# after restart table should be empty but valid
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cur2.execute("PREPARE iut_plan (int) AS INSERT INTO iut (id) VALUES ($1)")
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cur2.execute("EXECUTE iut_plan (43);")
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cur2.execute("SELECT * FROM iut")
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results = cur2.fetchall()
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# Unlogged sequences were introduced in v15. On <= v14, the sequence created
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# for the GENERATED ALWAYS AS IDENTITY column is logged, and hence it keeps
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# the old value (2) on restart. While on v15 and above, it's unlogged, so it
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# gets reset to 1.
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if env.pg_version <= PgVersion.V14:
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assert results == [(43, 2)]
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else:
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assert results == [(43, 1)]
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