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Commit ef49305

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Force synchronous commit to be enabled for all test_decoding tests.
Without that the tests fail when forced to be run against a cluster with synchronous_commit = off (as the WAL might not yet be flushed to disk by the point logical decoding gets called, and thus the expected output breaks). Most tests already do that, add it to a few newer tests. Author: Andres Freund
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‎contrib/test_decoding/expected/truncate.out

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-- predictability
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SET synchronous_commit = on;
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SELECT 'init' FROM pg_create_logical_replication_slot('regression_slot', 'test_decoding');
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?column?
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----------

‎contrib/test_decoding/specs/oldest_xmin.spec

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}
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session "s0"
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setup { SET synchronous_commit=on; }
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step "s0_begin" { BEGIN; }
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step "s0_getxid" { SELECT txid_current() IS NULL; }
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step "s0_alter" { ALTER TYPE basket DROP ATTRIBUTE mangos; }
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step "s0_get_changes" { SELECT data FROM pg_logical_slot_get_changes('isolation_slot', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '1'); }
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session "s1"
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setup { SET synchronous_commit=on; }
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step "s1_begin" { BEGIN; }
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step "s1_insert" { INSERT INTO harvest VALUES ((1, 2, 3)); }
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step "s1_commit" { COMMIT; }

‎contrib/test_decoding/specs/snapshot_transfer.spec

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}
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session "s0"
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setup { SET synchronous_commit=on; }
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step "s0_begin" { BEGIN; }
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step "s0_begin_sub0" { SAVEPOINT s0; }
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step "s0_log_assignment" { SELECT txid_current() IS NULL; }
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step "s0_get_changes" { SELECT data FROM pg_logical_slot_get_changes('isolation_slot', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '1'); }
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session "s1"
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setup { SET synchronous_commit=on; }
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step "s1_produce_new_snap" { ALTER TABLE harvest ADD COLUMN mangos int; }
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# start top-level without base snap, get base snap in subxact, then create new

‎contrib/test_decoding/sql/truncate.sql

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-- predictability
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SET synchronous_commit = on;
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SELECT 'init' FROM pg_create_logical_replication_slot('regression_slot', 'test_decoding');
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CREATE TABLE tab1 (id serial unique, data int);

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