src/test/subscription/t/017_stream_ddl.pl

# Copyright (c) 2021-2023, PostgreSQL Global Development Group

# Test streaming of large transaction with DDL and subtransactions
#
# This file is mainly to test the DDL/DML interaction of the publisher side,
# so we didn't add a parallel apply version for the tests in this file.
use strict;
use warnings;
use PostgreSQL::Test::Cluster;
use PostgreSQL::Test::Utils;
use Test::More;

# Create publisher node
my $node_publisher = PostgreSQL::Test::Cluster->new('publisher');
$node_publisher->init(allows_streaming => 'logical');
$node_publisher->append_conf('postgresql.conf',
	'logical_decoding_work_mem = 64kB');
$node_publisher->start;

# Create subscriber node
my $node_subscriber = PostgreSQL::Test::Cluster->new('subscriber');
$node_subscriber->init(allows_streaming => 'logical');
$node_subscriber->start;

# Create some preexisting content on publisher
$node_publisher->safe_psql('postgres',
	"CREATE TABLE test_tab (a int primary key, b varchar)");
$node_publisher->safe_psql('postgres',
	"INSERT INTO test_tab VALUES (1, 'foo'), (2, 'bar')");

# Setup structure on subscriber
$node_subscriber->safe_psql('postgres',
	"CREATE TABLE test_tab (a int primary key, b text, c INT, d INT, e INT, f INT)"
);

# Setup logical replication
my $publisher_connstr = $node_publisher->connstr . ' dbname=postgres';
$node_publisher->safe_psql('postgres',
	"CREATE PUBLICATION tap_pub FOR TABLE test_tab");

my $appname = 'tap_sub';
$node_subscriber->safe_psql('postgres',
	"CREATE SUBSCRIPTION tap_sub CONNECTION '$publisher_connstr application_name=$appname' PUBLICATION tap_pub WITH (streaming = on)"
);

# Wait for initial table sync to finish
$node_subscriber->wait_for_subscription_sync($node_publisher, $appname);

my $result =
  $node_subscriber->safe_psql('postgres',
	"SELECT count(*), count(c), count(d = 999) FROM test_tab");
is($result, qq(2|0|0), 'check initial data was copied to subscriber');

# a small (non-streamed) transaction with DDL and DML
$node_publisher->safe_psql(
	'postgres', q{
BEGIN;
INSERT INTO test_tab VALUES (3, md5(3::text));
ALTER TABLE test_tab ADD COLUMN c INT;
SAVEPOINT s1;
INSERT INTO test_tab VALUES (4, md5(4::text), -4);
COMMIT;
});

# large (streamed) transaction with DDL and DML
$node_publisher->safe_psql(
	'postgres', q{
BEGIN;
INSERT INTO test_tab SELECT i, md5(i::text), -i FROM generate_series(5, 1000) s(i);
ALTER TABLE test_tab ADD COLUMN d INT;
SAVEPOINT s1;
INSERT INTO test_tab SELECT i, md5(i::text), -i, 2*i FROM generate_series(1001, 2000) s(i);
COMMIT;
});

# a small (non-streamed) transaction with DDL and DML
$node_publisher->safe_psql(
	'postgres', q{
BEGIN;
INSERT INTO test_tab VALUES (2001, md5(2001::text), -2001, 2*2001);
ALTER TABLE test_tab ADD COLUMN e INT;
SAVEPOINT s1;
INSERT INTO test_tab VALUES (2002, md5(2002::text), -2002, 2*2002, -3*2002);
COMMIT;
});

$node_publisher->wait_for_catchup($appname);

$result =
  $node_subscriber->safe_psql('postgres',
	"SELECT count(*), count(c), count(d), count(e) FROM test_tab");
is($result, qq(2002|1999|1002|1),
	'check data was copied to subscriber in streaming mode and extra columns contain local defaults'
);

# A large (streamed) transaction with DDL and DML. One of the DDL is performed
# after DML to ensure that we invalidate the schema sent for test_tab so that
# the next transaction has to send the schema again.
$node_publisher->safe_psql(
	'postgres', q{
BEGIN;
INSERT INTO test_tab SELECT i, md5(i::text), -i, 2*i, -3*i FROM generate_series(2003,5000) s(i);
ALTER TABLE test_tab ADD COLUMN f INT;
COMMIT;
});

# A small transaction that won't get streamed. This is just to ensure that we
# send the schema again to reflect the last column added in the previous test.
$node_publisher->safe_psql(
	'postgres', q{
BEGIN;
INSERT INTO test_tab SELECT i, md5(i::text), -i, 2*i, -3*i, 4*i FROM generate_series(5001,5005) s(i);
COMMIT;
});

$node_publisher->wait_for_catchup($appname);

$result =
  $node_subscriber->safe_psql('postgres',
	"SELECT count(*), count(c), count(d), count(e), count(f) FROM test_tab");
is($result, qq(5005|5002|4005|3004|5),
	'check data was copied to subscriber for both streaming and non-streaming transactions'
);

$node_subscriber->stop;
$node_publisher->stop;

done_testing();