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# Copyright (c) 2021-2023, PostgreSQL Global Development Group
# Single-node test: value can be set, and is still present after recovery
use strict;
use warnings;
use PostgreSQL::Test::Utils;
use Test::More;
use PostgreSQL::Test::Cluster;
my $node = PostgreSQL::Test::Cluster->new('foxtrot');
$node->init;
$node->append_conf('postgresql.conf', 'track_commit_timestamp = on');
$node->start;
# Create a table, compare "now()" to the commit TS of its xmin
$node->safe_psql('postgres',
'create table t as select now from (select now(), pg_sleep(1)) f');
my $true = $node->safe_psql('postgres',
'select t.now - ts.* < \'1s\' from t, pg_class c, pg_xact_commit_timestamp(c.xmin) ts where relname = \'t\''
);
is($true, 't', 'commit TS is set');
my $ts = $node->safe_psql('postgres',
'select ts.* from pg_class, pg_xact_commit_timestamp(xmin) ts where relname = \'t\''
);
# Verify that we read the same TS after crash recovery
$node->stop('immediate');
$node->start;
my $recovered_ts = $node->safe_psql('postgres',
'select ts.* from pg_class, pg_xact_commit_timestamp(xmin) ts where relname = \'t\''
);
is($recovered_ts, $ts, 'commit TS remains after crash recovery');
done_testing();
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