ClickHouse/tests/integration/test_postgresql_replica_database_engine/test.py

import pytest
import time
import psycopg2
import os.path as p
import random

from helpers.cluster import ClickHouseCluster
from helpers.test_tools import assert_eq_with_retry
from psycopg2.extensions import ISOLATION_LEVEL_AUTOCOMMIT
from helpers.test_tools import TSV

from random import randrange
import threading

cluster = ClickHouseCluster(__file__)
instance = cluster.add_instance('instance',
        main_configs = ['configs/log_conf.xml'],
        user_configs = ['configs/users.xml'],
        with_postgres=True, stay_alive=True)

postgres_table_template = """
    CREATE TABLE IF NOT EXISTS "{}" (
    key Integer NOT NULL, value Integer, PRIMARY KEY(key))
    """
postgres_table_template_2 = """
    CREATE TABLE IF NOT EXISTS "{}" (
    key Integer NOT NULL, value1 Integer, value2 Integer, value3 Integer, PRIMARY KEY(key))
    """
postgres_table_template_3 = """
    CREATE TABLE IF NOT EXISTS "{}" (
    key1 Integer NOT NULL, value1 Integer, key2 Integer NOT NULL, value2 Integer NOT NULL)
    """

def get_postgres_conn(ip, port, database=False, auto_commit=True, database_name='postgres_database', replication=False):
    if database == True:
        conn_string = "host={} port={} dbname='{}' user='postgres' password='mysecretpassword'".format(ip, port, database_name)
    else:
        conn_string = "host={} port={} user='postgres' password='mysecretpassword'".format(ip, port)

    if replication:
        conn_string += " replication='database'"

    conn = psycopg2.connect(conn_string)
    if auto_commit:
        conn.set_isolation_level(ISOLATION_LEVEL_AUTOCOMMIT)
        conn.autocommit = True
    return conn

def create_replication_slot(conn, slot_name='user_slot'):
    cursor = conn.cursor()
    cursor.execute('CREATE_REPLICATION_SLOT {} LOGICAL pgoutput EXPORT_SNAPSHOT'.format(slot_name))
    result = cursor.fetchall()
    print(result[0][0]) # slot name
    print(result[0][1]) # start lsn
    print(result[0][2]) # snapshot
    return result[0][2]

def drop_replication_slot(conn, slot_name='user_slot'):
    cursor = conn.cursor()
    cursor.execute("select pg_drop_replication_slot('{}')".format(slot_name))

def create_postgres_db(cursor, name='postgres_database'):
    cursor.execute("CREATE DATABASE {}".format(name))

def drop_postgres_db(cursor, name='postgres_database'):
    cursor.execute("DROP DATABASE IF EXISTS {}".format(name))

def create_clickhouse_postgres_db(ip, port, name='postgres_database'):
    instance.query('''
            CREATE DATABASE {}
            ENGINE = PostgreSQL('{}:{}', '{}', 'postgres', 'mysecretpassword')'''.format(name, ip, port, name))

def drop_clickhouse_postgres_db(name='postgres_database'):
    instance.query('DROP DATABASE {}'.format(name))

def create_materialized_db(ip, port,
                           materialized_database='test_database',
                           postgres_database='postgres_database',
                           settings=[]):
    instance.query(f"DROP DATABASE IF EXISTS {materialized_database}")
    create_query = f"CREATE DATABASE {materialized_database} ENGINE = MaterializedPostgreSQL('{ip}:{port}', '{postgres_database}', 'postgres', 'mysecretpassword')"
    if len(settings) > 0:
        create_query += " SETTINGS "
        for i in range(len(settings)):
            if i != 0:
                create_query += ', '
            create_query += settings[i]
    instance.query(create_query)
    assert materialized_database in instance.query('SHOW DATABASES')

def drop_materialized_db(materialized_database='test_database'):
    instance.query('DROP DATABASE IF EXISTS {}'.format(materialized_database))
    assert materialized_database not in instance.query('SHOW DATABASES')

def drop_postgres_table(cursor, table_name):
    cursor.execute("""DROP TABLE IF EXISTS "{}" """.format(table_name))

def create_postgres_table(cursor, table_name, replica_identity_full=False, template=postgres_table_template):
    drop_postgres_table(cursor, table_name)
    cursor.execute(template.format(table_name))
    if replica_identity_full:
        cursor.execute('ALTER TABLE {} REPLICA IDENTITY FULL;'.format(table_name))

queries = [
    'INSERT INTO postgresql_replica_{} select i, i from generate_series(0, 10000) as t(i);',
    'DELETE FROM postgresql_replica_{} WHERE (value*value) % 3 = 0;',
    'UPDATE postgresql_replica_{} SET value = value - 125 WHERE key % 2 = 0;',
    "UPDATE postgresql_replica_{} SET key=key+20000 WHERE key%2=0",
    'INSERT INTO postgresql_replica_{} select i, i from generate_series(40000, 50000) as t(i);',
    'DELETE FROM postgresql_replica_{} WHERE key % 10 = 0;',
    'UPDATE postgresql_replica_{} SET value = value + 101 WHERE key % 2 = 1;',
    "UPDATE postgresql_replica_{} SET key=key+80000 WHERE key%2=1",
    'DELETE FROM postgresql_replica_{} WHERE value % 2 = 0;',
    'UPDATE postgresql_replica_{} SET value = value + 2000 WHERE key % 5 = 0;',
    'INSERT INTO postgresql_replica_{} select i, i from generate_series(200000, 250000) as t(i);',
    'DELETE FROM postgresql_replica_{} WHERE value % 3 = 0;',
    'UPDATE postgresql_replica_{} SET value = value * 2 WHERE key % 3 = 0;',
    "UPDATE postgresql_replica_{} SET key=key+500000 WHERE key%2=1",
    'INSERT INTO postgresql_replica_{} select i, i from generate_series(1000000, 1050000) as t(i);',
    'DELETE FROM postgresql_replica_{} WHERE value % 9 = 2;',
    "UPDATE postgresql_replica_{} SET key=key+10000000",
    'UPDATE postgresql_replica_{} SET value = value + 2  WHERE key % 3 = 1;',
    'DELETE FROM postgresql_replica_{} WHERE value%5 = 0;'
    ]


def assert_nested_table_is_created(table_name, materialized_database='test_database'):
    database_tables = instance.query('SHOW TABLES FROM {}'.format(materialized_database))
    while table_name not in database_tables:
        time.sleep(0.2)
        database_tables = instance.query('SHOW TABLES FROM {}'.format(materialized_database))
    assert(table_name in database_tables)


@pytest.mark.timeout(320)
def assert_number_of_columns(expected, table_name, database_name='test_database'):
    result = instance.query(f"select count() from system.columns where table = '{table_name}' and database = '{database_name}' and not startsWith(name, '_')")
    while (int(result) != expected):
        time.sleep(1)
        result = instance.query(f"select count() from system.columns where table = '{table_name}' and database = '{database_name}' and not startsWith(name, '_')")


@pytest.mark.timeout(320)
def check_tables_are_synchronized(table_name, order_by='key', postgres_database='postgres_database', materialized_database='test_database'):
    assert_nested_table_is_created(table_name, materialized_database)

    expected = instance.query('select * from {}.{} order by {};'.format(postgres_database, table_name, order_by))
    result = instance.query('select * from {}.{} order by {};'.format(materialized_database, table_name, order_by))

    while result != expected:
        time.sleep(0.5)
        result = instance.query('select * from {}.{} order by {};'.format(materialized_database, table_name, order_by))

    assert(result == expected)


@pytest.fixture(scope="module")
def started_cluster():
    try:
        cluster.start()
        conn = get_postgres_conn(ip=cluster.postgres_ip, port=cluster.postgres_port)
        cursor = conn.cursor()
        create_postgres_db(cursor, 'postgres_database')
        create_clickhouse_postgres_db(ip=cluster.postgres_ip, port=cluster.postgres_port)

        instance.query("DROP DATABASE IF EXISTS test_database")
        yield cluster

    finally:
        cluster.shutdown()


def test_load_and_sync_all_database_tables(started_cluster):
    drop_materialized_db()
    conn = get_postgres_conn(ip=started_cluster.postgres_ip,
                             port=started_cluster.postgres_port,
                             database=True)
    cursor = conn.cursor()
    NUM_TABLES = 5

    for i in range(NUM_TABLES):
        table_name = 'postgresql_replica_{}'.format(i)
        create_postgres_table(cursor, table_name);
        instance.query("INSERT INTO postgres_database.{} SELECT number, number from numbers(50)".format(table_name))

    create_materialized_db(ip=started_cluster.postgres_ip,
                           port=started_cluster.postgres_port)
    assert 'test_database' in instance.query('SHOW DATABASES')

    for i in range(NUM_TABLES):
        table_name = 'postgresql_replica_{}'.format(i)
        check_tables_are_synchronized(table_name);
        cursor.execute('drop table {};'.format(table_name))

    result = instance.query('''SELECT count() FROM system.tables WHERE database = 'test_database';''')
    assert(int(result) == NUM_TABLES)

    drop_materialized_db()
    for i in range(NUM_TABLES):
        cursor.execute('drop table if exists postgresql_replica_{};'.format(i))


def test_replicating_dml(started_cluster):
    drop_materialized_db()
    conn = get_postgres_conn(ip=started_cluster.postgres_ip,
                             port=started_cluster.postgres_port,
                             database=True)
    cursor = conn.cursor()
    NUM_TABLES = 5

    for i in range(NUM_TABLES):
        create_postgres_table(cursor, 'postgresql_replica_{}'.format(i));
        instance.query("INSERT INTO postgres_database.postgresql_replica_{} SELECT number, {} from numbers(50)".format(i, i))

    create_materialized_db(ip=started_cluster.postgres_ip,
                           port=started_cluster.postgres_port)

    for i in range(NUM_TABLES):
        instance.query("INSERT INTO postgres_database.postgresql_replica_{} SELECT 50 + number, {} from numbers(1000)".format(i, i))

    for i in range(NUM_TABLES):
        table_name = 'postgresql_replica_{}'.format(i)
        check_tables_are_synchronized(table_name);

    for i in range(NUM_TABLES):
        cursor.execute('UPDATE postgresql_replica_{} SET value = {} * {} WHERE key < 50;'.format(i, i, i))
        cursor.execute('UPDATE postgresql_replica_{} SET value = {} * {} * {} WHERE key >= 50;'.format(i, i, i, i))

    for i in range(NUM_TABLES):
        check_tables_are_synchronized('postgresql_replica_{}'.format(i));

    for i in range(NUM_TABLES):
        cursor.execute('DELETE FROM postgresql_replica_{} WHERE (value*value + {}) % 2 = 0;'.format(i, i))
        cursor.execute('UPDATE postgresql_replica_{} SET value = value - (value % 7) WHERE key > 128 AND key < 512;'.format(i))
        cursor.execute('DELETE FROM postgresql_replica_{} WHERE key % 7 = 1;'.format(i, i))

    for i in range(NUM_TABLES):
        check_tables_are_synchronized('postgresql_replica_{}'.format(i));

    for i in range(NUM_TABLES):
        cursor.execute('drop table if exists postgresql_replica_{};'.format(i))

    drop_materialized_db()


def test_different_data_types(started_cluster):
    drop_materialized_db()
    conn = get_postgres_conn(ip=started_cluster.postgres_ip,
                             port=started_cluster.postgres_port,
                             database=True)
    cursor = conn.cursor()
    cursor.execute('drop table if exists test_data_types;')
    cursor.execute('drop table if exists test_array_data_type;')

    cursor.execute(
        '''CREATE TABLE test_data_types (
        id integer PRIMARY KEY, a smallint, b integer, c bigint, d real, e double precision, f serial, g bigserial,
        h timestamp, i date, j decimal(5, 5), k numeric(5, 5))''')

    cursor.execute(
        '''CREATE TABLE test_array_data_type
           (
                key Integer NOT NULL PRIMARY KEY,
                a Date[] NOT NULL,                          -- Date
                b Timestamp[] NOT NULL,                     -- DateTime64(6)
                c real[][] NOT NULL,                        -- Float32
                d double precision[][] NOT NULL,            -- Float64
                e decimal(5, 5)[][][] NOT NULL,             -- Decimal32
                f integer[][][] NOT NULL,                   -- Int32
                g Text[][][][][] NOT NULL,                  -- String
                h Integer[][][],                            -- Nullable(Int32)
                i Char(2)[][][][],                          -- Nullable(String)
                k Char(2)[]                                 -- Nullable(String)
           )''')

    create_materialized_db(ip=started_cluster.postgres_ip,
                           port=started_cluster.postgres_port)

    for i in range(10):
        instance.query('''
            INSERT INTO postgres_database.test_data_types VALUES
            ({}, -32768, -2147483648, -9223372036854775808, 1.12345, 1.1234567890, 2147483647, 9223372036854775807, '2000-05-12 12:12:12.012345', '2000-05-12', 0.2, 0.2)'''.format(i))

    check_tables_are_synchronized('test_data_types', 'id');
    result = instance.query('SELECT * FROM test_database.test_data_types ORDER BY id LIMIT 1;')
    assert(result == '0\t-32768\t-2147483648\t-9223372036854775808\t1.12345\t1.123456789\t2147483647\t9223372036854775807\t2000-05-12 12:12:12.012345\t2000-05-12\t0.2\t0.2\n')

    for i in range(10):
        col = random.choice(['a', 'b', 'c'])
        cursor.execute('UPDATE test_data_types SET {} = {};'.format(col, i))
        cursor.execute('''UPDATE test_data_types SET i = '2020-12-12';'''.format(col, i))

    check_tables_are_synchronized('test_data_types', 'id');

    instance.query("INSERT INTO postgres_database.test_array_data_type "
        "VALUES ("
        "0, "
        "['2000-05-12', '2000-05-12'], "
        "['2000-05-12 12:12:12.012345', '2000-05-12 12:12:12.012345'], "
        "[[1.12345], [1.12345], [1.12345]], "
        "[[1.1234567891], [1.1234567891], [1.1234567891]], "
        "[[[0.11111, 0.11111]], [[0.22222, 0.22222]], [[0.33333, 0.33333]]], "
        "[[[1, 1], [1, 1]], [[3, 3], [3, 3]], [[4, 4], [5, 5]]], "
        "[[[[['winx', 'winx', 'winx']]]]], "
        "[[[1, NULL], [NULL, 1]], [[NULL, NULL], [NULL, NULL]], [[4, 4], [5, 5]]], "
        "[[[[NULL]]]], "
        "[]"
        ")")

    expected = (
        "0\t" +
        "['2000-05-12','2000-05-12']\t" +
        "['2000-05-12 12:12:12.012345','2000-05-12 12:12:12.012345']\t" +
        "[[1.12345],[1.12345],[1.12345]]\t" +
        "[[1.1234567891],[1.1234567891],[1.1234567891]]\t" +
        "[[[0.11111,0.11111]],[[0.22222,0.22222]],[[0.33333,0.33333]]]\t"
        "[[[1,1],[1,1]],[[3,3],[3,3]],[[4,4],[5,5]]]\t"
        "[[[[['winx','winx','winx']]]]]\t"
        "[[[1,NULL],[NULL,1]],[[NULL,NULL],[NULL,NULL]],[[4,4],[5,5]]]\t"
        "[[[[NULL]]]]\t"
        "[]\n"
        )

    check_tables_are_synchronized('test_array_data_type');
    result = instance.query('SELECT * FROM test_database.test_array_data_type ORDER BY key;')
    assert(result == expected)

    drop_materialized_db()
    cursor.execute('drop table if exists test_data_types;')
    cursor.execute('drop table if exists test_array_data_type;')


def test_load_and_sync_subset_of_database_tables(started_cluster):
    drop_materialized_db()
    conn = get_postgres_conn(ip=started_cluster.postgres_ip,
                             port=started_cluster.postgres_port,
                             database=True)
    cursor = conn.cursor()
    NUM_TABLES = 10

    publication_tables = ''
    for i in range(NUM_TABLES):
        table_name = 'postgresql_replica_{}'.format(i)
        create_postgres_table(cursor, 'postgresql_replica_{}'.format(i));
        instance.query("INSERT INTO postgres_database.postgresql_replica_{} SELECT number, number from numbers(50)".format(i))

        if i < int(NUM_TABLES/2):
            if publication_tables != '':
                publication_tables += ', '
            publication_tables += table_name

    create_materialized_db(ip=started_cluster.postgres_ip,
                           port=started_cluster.postgres_port,
                           settings=["materialized_postgresql_tables_list = '{}'".format(publication_tables)])
    assert 'test_database' in instance.query('SHOW DATABASES')

    time.sleep(1)

    for i in range(int(NUM_TABLES/2)):
        table_name = 'postgresql_replica_{}'.format(i)
        assert_nested_table_is_created(table_name)

    result = instance.query('''SELECT count() FROM system.tables WHERE database = 'test_database';''')
    assert(int(result) == int(NUM_TABLES/2))

    database_tables = instance.query('SHOW TABLES FROM test_database')
    for i in range(NUM_TABLES):
        table_name = 'postgresql_replica_{}'.format(i)
        if i < int(NUM_TABLES/2):
            assert table_name in database_tables
        else:
            assert table_name not in database_tables
        instance.query("INSERT INTO postgres_database.{} SELECT 50 + number, {} from numbers(100)".format(table_name, i))

    for i in range(NUM_TABLES):
        table_name = 'postgresql_replica_{}'.format(i)
        if i < int(NUM_TABLES/2):
            check_tables_are_synchronized(table_name);

    drop_materialized_db()
    for i in range(NUM_TABLES):
        cursor.execute('drop table if exists postgresql_replica_{};'.format(i))


def test_changing_replica_identity_value(started_cluster):
    drop_materialized_db()
    conn = get_postgres_conn(ip=started_cluster.postgres_ip,
                             port=started_cluster.postgres_port,
                             database=True)
    cursor = conn.cursor()
    create_postgres_table(cursor, 'postgresql_replica');
    instance.query("INSERT INTO postgres_database.postgresql_replica SELECT 50 + number, number from numbers(50)")

    create_materialized_db(ip=started_cluster.postgres_ip,
                           port=started_cluster.postgres_port)

    instance.query("INSERT INTO postgres_database.postgresql_replica SELECT 100 + number, number from numbers(50)")
    check_tables_are_synchronized('postgresql_replica');
    cursor.execute("UPDATE postgresql_replica SET key=key-25 WHERE key<100 ")
    check_tables_are_synchronized('postgresql_replica');

    drop_materialized_db()
    cursor.execute('drop table if exists postgresql_replica;')


def test_clickhouse_restart(started_cluster):
    drop_materialized_db()
    conn = get_postgres_conn(ip=started_cluster.postgres_ip,
                             port=started_cluster.postgres_port,
                             database=True)
    cursor = conn.cursor()
    NUM_TABLES = 5

    for i in range(NUM_TABLES):
        create_postgres_table(cursor, 'postgresql_replica_{}'.format(i));
        instance.query("INSERT INTO postgres_database.postgresql_replica_{} SELECT number, {} from numbers(50)".format(i, i))

    instance.query("CREATE DATABASE test_database ENGINE = MaterializedPostgreSQL('postgres1:5432', 'postgres_database', 'postgres', 'mysecretpassword')")

    for i in range(NUM_TABLES):
        table_name = 'postgresql_replica_{}'.format(i)
        check_tables_are_synchronized(table_name);

    for i in range(NUM_TABLES):
        instance.query("INSERT INTO postgres_database.postgresql_replica_{} SELECT 50 + number, {} from numbers(50000)".format(i, i))

    instance.restart_clickhouse()

    for i in range(NUM_TABLES):
        check_tables_are_synchronized('postgresql_replica_{}'.format(i));

    drop_materialized_db()
    for i in range(NUM_TABLES):
        cursor.execute('drop table if exists postgresql_replica_{};'.format(i))


def test_replica_identity_index(started_cluster):
    drop_materialized_db()
    conn = get_postgres_conn(ip=started_cluster.postgres_ip,
                             port=started_cluster.postgres_port,
                             database=True)
    cursor = conn.cursor()

    create_postgres_table(cursor, 'postgresql_replica', template=postgres_table_template_3);
    cursor.execute("CREATE unique INDEX idx on postgresql_replica(key1, key2);")
    cursor.execute("ALTER TABLE postgresql_replica REPLICA IDENTITY USING INDEX idx")
    instance.query("INSERT INTO postgres_database.postgresql_replica SELECT number, number, number, number from numbers(50, 10)")

    create_materialized_db(ip=started_cluster.postgres_ip,
                           port=started_cluster.postgres_port)
    instance.query("INSERT INTO postgres_database.postgresql_replica SELECT number, number, number, number from numbers(100, 10)")
    check_tables_are_synchronized('postgresql_replica', order_by='key1');

    cursor.execute("UPDATE postgresql_replica SET key1=key1-25 WHERE key1<100 ")
    cursor.execute("UPDATE postgresql_replica SET key2=key2-25 WHERE key2>100 ")
    cursor.execute("UPDATE postgresql_replica SET value1=value1+100 WHERE key1<100 ")
    cursor.execute("UPDATE postgresql_replica SET value2=value2+200 WHERE key2>100 ")
    check_tables_are_synchronized('postgresql_replica', order_by='key1');

    cursor.execute('DELETE FROM postgresql_replica WHERE key2<75;')
    check_tables_are_synchronized('postgresql_replica', order_by='key1');

    drop_materialized_db()
    cursor.execute('drop table if exists postgresql_replica;')


def test_table_schema_changes(started_cluster):
    drop_materialized_db()
    conn = get_postgres_conn(ip=started_cluster.postgres_ip,
                             port=started_cluster.postgres_port,
                             database=True)
    cursor = conn.cursor()
    NUM_TABLES = 5

    for i in range(NUM_TABLES):
        create_postgres_table(cursor, 'postgresql_replica_{}'.format(i), template=postgres_table_template_2);
        instance.query("INSERT INTO postgres_database.postgresql_replica_{} SELECT number, {}, {}, {} from numbers(25)".format(i, i, i, i))

    create_materialized_db(ip=started_cluster.postgres_ip,
                           port=started_cluster.postgres_port,
                           settings=["materialized_postgresql_allow_automatic_update = 1"])

    for i in range(NUM_TABLES):
        instance.query("INSERT INTO postgres_database.postgresql_replica_{} SELECT 25 + number, {}, {}, {} from numbers(25)".format(i, i, i, i))

    for i in range(NUM_TABLES):
        check_tables_are_synchronized('postgresql_replica_{}'.format(i));

    expected = instance.query("SELECT key, value1, value3 FROM test_database.postgresql_replica_3 ORDER BY key");

    altered_idx = random.randint(0, 4)
    altered_table = f'postgresql_replica_{altered_idx}'
    cursor.execute(f"ALTER TABLE {altered_table} DROP COLUMN value2")

    for i in range(NUM_TABLES):
        cursor.execute(f"INSERT INTO postgresql_replica_{i} VALUES (50, {i}, {i})")
        cursor.execute(f"UPDATE {altered_table} SET value3 = 12 WHERE key%2=0")

    time.sleep(2)
    assert_nested_table_is_created(altered_table)
    assert_number_of_columns(3, altered_table)
    check_tables_are_synchronized(altered_table)
    print('check1 OK')

    for i in range(NUM_TABLES):
        check_tables_are_synchronized('postgresql_replica_{}'.format(i));

    for i in range(NUM_TABLES):
        if i != altered_idx:
            instance.query("INSERT INTO postgres_database.postgresql_replica_{} SELECT 51 + number, {}, {}, {} from numbers(49)".format(i, i, i, i))
        else:
            instance.query("INSERT INTO postgres_database.postgresql_replica_{} SELECT 51 + number, {}, {} from numbers(49)".format(i, i, i))

    check_tables_are_synchronized(altered_table);
    print('check2 OK')
    for i in range(NUM_TABLES):
        check_tables_are_synchronized('postgresql_replica_{}'.format(i));

    for i in range(NUM_TABLES):
        cursor.execute('drop table postgresql_replica_{};'.format(i))

    instance.query("DROP DATABASE test_database")
    for i in range(NUM_TABLES):
        cursor.execute('drop table if exists postgresql_replica_{};'.format(i))


def test_many_concurrent_queries(started_cluster):
    drop_materialized_db()
    conn = get_postgres_conn(ip=started_cluster.postgres_ip,
                             port=started_cluster.postgres_port,
                             database=True)
    cursor = conn.cursor()
    NUM_TABLES = 5

    for i in range(NUM_TABLES):
        create_postgres_table(cursor, 'postgresql_replica_{}'.format(i));
        instance.query('INSERT INTO postgres_database.postgresql_replica_{} SELECT number, number from numbers(10000)'.format(i))
    n = [10000]

    query_pool = ['DELETE FROM postgresql_replica_{} WHERE (value*value) % 3 = 0;',
        'UPDATE postgresql_replica_{} SET value = value - 125 WHERE key % 2 = 0;',
        'DELETE FROM postgresql_replica_{} WHERE key % 10 = 0;',
        'UPDATE postgresql_replica_{} SET value = value*5 WHERE key % 2 = 1;',
        'DELETE FROM postgresql_replica_{} WHERE value % 2 = 0;',
        'UPDATE postgresql_replica_{} SET value = value + 2000 WHERE key % 5 = 0;',
        'DELETE FROM postgresql_replica_{} WHERE value % 3 = 0;',
        'UPDATE postgresql_replica_{} SET value = value * 2 WHERE key % 3 = 0;',
        'DELETE FROM postgresql_replica_{} WHERE value % 9 = 2;',
        'UPDATE postgresql_replica_{} SET value = value + 2  WHERE key % 3 = 1;',
        'DELETE FROM postgresql_replica_{} WHERE value%5 = 0;']

    def attack(thread_id):
        print('thread {}'.format(thread_id))
        k = 10000
        for i in range(20):
            query_id = random.randrange(0, len(query_pool)-1)
            table_id = random.randrange(0, 5) # num tables

            # random update / delete query
            cursor.execute(query_pool[query_id].format(table_id))
            print("table {} query {} ok".format(table_id, query_id))

            # allow some thread to do inserts (not to violate key constraints)
            if thread_id < 5:
                print("try insert table {}".format(thread_id))
                instance.query('INSERT INTO postgres_database.postgresql_replica_{} SELECT {}*10000*({} +  number), number from numbers(1000)'.format(i, thread_id, k))
                k += 1
                print("insert table {} ok".format(thread_id))

                if i == 5:
                    # also change primary key value
                    print("try update primary key {}".format(thread_id))
                    cursor.execute("UPDATE postgresql_replica_{} SET key=key%100000+100000*{} WHERE key%{}=0".format(thread_id, i+1, i+1))
                    print("update primary key {} ok".format(thread_id))

    threads = []
    threads_num = 16
    for i in range(threads_num):
        threads.append(threading.Thread(target=attack, args=(i,)))

    create_materialized_db(ip=started_cluster.postgres_ip,
                           port=started_cluster.postgres_port)

    for thread in threads:
        time.sleep(random.uniform(0, 1))
        thread.start()

    n[0] = 50000
    for table_id in range(NUM_TABLES):
        n[0] += 1
        instance.query('INSERT INTO postgres_database.postgresql_replica_{} SELECT {} +  number, number from numbers(5000)'.format(table_id, n[0]))
        #cursor.execute("UPDATE postgresql_replica_{} SET key=key%100000+100000*{} WHERE key%{}=0".format(table_id, table_id+1, table_id+1))

    for thread in threads:
        thread.join()

    for i in range(NUM_TABLES):
        check_tables_are_synchronized('postgresql_replica_{}'.format(i));
        count1 = instance.query('SELECT count() FROM postgres_database.postgresql_replica_{}'.format(i))
        count2 = instance.query('SELECT count() FROM (SELECT * FROM test_database.postgresql_replica_{})'.format(i))
        assert(int(count1) == int(count2))
        print(count1, count2)

    drop_materialized_db()
    for i in range(NUM_TABLES):
        cursor.execute('drop table if exists postgresql_replica_{};'.format(i))


def test_single_transaction(started_cluster):
    drop_materialized_db()
    conn = get_postgres_conn(ip=started_cluster.postgres_ip,
                             port=started_cluster.postgres_port,
                             database=True, auto_commit=False)
    cursor = conn.cursor()

    create_postgres_table(cursor, 'postgresql_replica_0');
    conn.commit()

    create_materialized_db(ip=started_cluster.postgres_ip,
                           port=started_cluster.postgres_port)
    assert_nested_table_is_created('postgresql_replica_0')

    for query in queries:
        print('query {}'.format(query))
        cursor.execute(query.format(0))

    time.sleep(5)
    result = instance.query("select count() from test_database.postgresql_replica_0")
    # no commit yet
    assert(int(result) == 0)

    conn.commit()
    check_tables_are_synchronized('postgresql_replica_0');

    drop_materialized_db()
    cursor.execute('drop table if exists postgresql_replica_0;')


def test_virtual_columns(started_cluster):
    drop_materialized_db()
    conn = get_postgres_conn(ip=started_cluster.postgres_ip,
                             port=started_cluster.postgres_port,
                             database=True)
    cursor = conn.cursor()
    create_postgres_table(cursor, 'postgresql_replica_0');

    create_materialized_db(ip=started_cluster.postgres_ip,
                           port=started_cluster.postgres_port,
                           settings=["materialized_postgresql_allow_automatic_update = 1"])
    assert_nested_table_is_created('postgresql_replica_0')
    instance.query("INSERT INTO postgres_database.postgresql_replica_0 SELECT number, number from numbers(10)")
    check_tables_are_synchronized('postgresql_replica_0');

    # just check that it works, no check with `expected` because _version is taken as LSN, which will be different each time.
    result = instance.query('SELECT key, value, _sign, _version FROM test_database.postgresql_replica_0;')
    print(result)

    cursor.execute("ALTER TABLE postgresql_replica_0 ADD COLUMN value2 integer")
    instance.query("INSERT INTO postgres_database.postgresql_replica_0 SELECT number, number, number from numbers(10, 10)")
    assert_number_of_columns(3, 'postgresql_replica_0')
    check_tables_are_synchronized('postgresql_replica_0');

    result = instance.query('SELECT key, value, value2,  _sign, _version FROM test_database.postgresql_replica_0;')
    print(result)

    instance.query("INSERT INTO postgres_database.postgresql_replica_0 SELECT number, number, number from numbers(20, 10)")
    check_tables_are_synchronized('postgresql_replica_0');

    result = instance.query('SELECT key, value, value2,  _sign, _version FROM test_database.postgresql_replica_0;')
    print(result)

    drop_materialized_db()
    cursor.execute('drop table if exists postgresql_replica_0;')


def test_multiple_databases(started_cluster):
    drop_materialized_db('test_database_1')
    drop_materialized_db('test_database_2')
    NUM_TABLES = 5

    conn = get_postgres_conn(ip=started_cluster.postgres_ip,
                             port=started_cluster.postgres_port,
                             database=False)
    cursor = conn.cursor()
    create_postgres_db(cursor, 'postgres_database_1')
    create_postgres_db(cursor, 'postgres_database_2')

    conn1 = get_postgres_conn(ip=started_cluster.postgres_ip,
                             port=started_cluster.postgres_port,
                             database=True, database_name='postgres_database_1')
    conn2 = get_postgres_conn(ip=started_cluster.postgres_ip,
                             port=started_cluster.postgres_port,
                             database=True, database_name='postgres_database_2')

    cursor1 = conn1.cursor()
    cursor2 = conn2.cursor()

    create_clickhouse_postgres_db(cluster.postgres_ip, cluster.postgres_port, 'postgres_database_1')
    create_clickhouse_postgres_db(cluster.postgres_ip, cluster.postgres_port, 'postgres_database_2')

    cursors = [cursor1, cursor2]
    for cursor_id in range(len(cursors)):
        for i in range(NUM_TABLES):
            table_name = 'postgresql_replica_{}'.format(i)
            create_postgres_table(cursors[cursor_id], table_name);
            instance.query("INSERT INTO postgres_database_{}.{} SELECT number, number from numbers(50)".format(cursor_id + 1, table_name))
    print('database 1 tables: ', instance.query('''SELECT name FROM system.tables WHERE database = 'postgres_database_1';'''))
    print('database 2 tables: ', instance.query('''SELECT name FROM system.tables WHERE database = 'postgres_database_2';'''))

    create_materialized_db(started_cluster.postgres_ip, started_cluster.postgres_port,
            'test_database_1', 'postgres_database_1')
    create_materialized_db(started_cluster.postgres_ip, started_cluster.postgres_port,
            'test_database_2', 'postgres_database_2')

    cursors = [cursor1, cursor2]
    for cursor_id in range(len(cursors)):
        for i in range(NUM_TABLES):
            table_name = 'postgresql_replica_{}'.format(i)
            instance.query("INSERT INTO postgres_database_{}.{} SELECT 50 + number, number from numbers(50)".format(cursor_id + 1, table_name))

    for cursor_id in range(len(cursors)):
        for i in range(NUM_TABLES):
            table_name = 'postgresql_replica_{}'.format(i)
            check_tables_are_synchronized(
                    table_name, 'key', 'postgres_database_{}'.format(cursor_id + 1), 'test_database_{}'.format(cursor_id + 1));

    for i in range(NUM_TABLES):
        cursor1.execute('drop table if exists postgresql_replica_{};'.format(i))
    for i in range(NUM_TABLES):
        cursor2.execute('drop table if exists postgresql_replica_{};'.format(i))

    drop_clickhouse_postgres_db('postgres_database_1')
    drop_clickhouse_postgres_db('postgres_database_2')

    drop_materialized_db('test_database_1')
    drop_materialized_db('test_database_2')


def test_concurrent_transactions(started_cluster):
    drop_materialized_db()
    conn = get_postgres_conn(ip=started_cluster.postgres_ip,
                             port=started_cluster.postgres_port,
                             database=True)
    cursor = conn.cursor()
    NUM_TABLES = 6

    for i in range(NUM_TABLES):
        create_postgres_table(cursor, 'postgresql_replica_{}'.format(i));

    def transaction(thread_id):
        conn = get_postgres_conn(ip=started_cluster.postgres_ip,
                                 port=started_cluster.postgres_port,
                                 database=True, auto_commit=False)
        cursor_ = conn.cursor()
        for query in queries:
            cursor_.execute(query.format(thread_id))
            print('thread {}, query {}'.format(thread_id, query))
        conn.commit()

    threads = []
    threads_num = 6
    for i in range(threads_num):
        threads.append(threading.Thread(target=transaction, args=(i,)))

    create_materialized_db(ip=started_cluster.postgres_ip,
                           port=started_cluster.postgres_port)

    for thread in threads:
        time.sleep(random.uniform(0, 0.5))
        thread.start()
    for thread in threads:
        thread.join()

    for i in range(NUM_TABLES):
        check_tables_are_synchronized('postgresql_replica_{}'.format(i));
        count1 = instance.query('SELECT count() FROM postgres_database.postgresql_replica_{}'.format(i))
        count2 = instance.query('SELECT count() FROM (SELECT * FROM test_database.postgresql_replica_{})'.format(i))
        print(int(count1), int(count2), sep=' ')
        assert(int(count1) == int(count2))

    drop_materialized_db()
    for i in range(NUM_TABLES):
        cursor.execute('drop table if exists postgresql_replica_{};'.format(i))


def test_abrupt_connection_loss_while_heavy_replication(started_cluster):
    drop_materialized_db()
    conn = get_postgres_conn(ip=started_cluster.postgres_ip,
                             port=started_cluster.postgres_port,
                             database=True)
    cursor = conn.cursor()
    NUM_TABLES = 6

    for i in range(NUM_TABLES):
        create_postgres_table(cursor, 'postgresql_replica_{}'.format(i));

    def transaction(thread_id):
        if thread_id % 2:
            conn = get_postgres_conn(ip=started_cluster.postgres_ip,
                                    port=started_cluster.postgres_port,
                                    database=True, auto_commit=True)
        else:
            conn = get_postgres_conn(ip=started_cluster.postgres_ip,
                                    port=started_cluster.postgres_port,
                                    database=True, auto_commit=False)
        cursor_ = conn.cursor()
        for query in queries:
            cursor_.execute(query.format(thread_id))
            print('thread {}, query {}'.format(thread_id, query))
        if thread_id % 2 == 0:
            conn.commit()

    threads = []
    threads_num = 6
    for i in range(threads_num):
        threads.append(threading.Thread(target=transaction, args=(i,)))

    create_materialized_db(ip=started_cluster.postgres_ip,
                           port=started_cluster.postgres_port)

    for thread in threads:
        time.sleep(random.uniform(0, 0.5))
        thread.start()

    # Join here because it takes time for data to reach wal
    for thread in threads:
        thread.join()
    time.sleep(1)
    started_cluster.pause_container('postgres1')

    for i in range(NUM_TABLES):
        result = instance.query("SELECT count() FROM test_database.postgresql_replica_{}".format(i))
        print(result) # Just debug

    started_cluster.unpause_container('postgres1')

    for i in range(NUM_TABLES):
        check_tables_are_synchronized('postgresql_replica_{}'.format(i));

    for i in range(NUM_TABLES):
        result = instance.query("SELECT count() FROM test_database.postgresql_replica_{}".format(i))
        print(result) # Just debug

    drop_materialized_db()
    for i in range(NUM_TABLES):
        cursor.execute('drop table if exists postgresql_replica_{};'.format(i))


def test_drop_database_while_replication_startup_not_finished(started_cluster):
    drop_materialized_db()
    conn = get_postgres_conn(ip=started_cluster.postgres_ip,
                             port=started_cluster.postgres_port,
                             database=True)
    cursor = conn.cursor()
    NUM_TABLES = 5

    for i in range(NUM_TABLES):
        table_name = 'postgresql_replica_{}'.format(i)
        create_postgres_table(cursor, table_name);
        instance.query("INSERT INTO postgres_database.{} SELECT number, number from numbers(100000)".format(table_name))

    for i in range(6):
        create_materialized_db(ip=started_cluster.postgres_ip, port=started_cluster.postgres_port)
        time.sleep(0.5 * i)
        drop_materialized_db()

    for i in range(NUM_TABLES):
        cursor.execute('drop table if exists postgresql_replica_{};'.format(i))


def test_restart_server_while_replication_startup_not_finished(started_cluster):
    drop_materialized_db()
    conn = get_postgres_conn(ip=started_cluster.postgres_ip,
                             port=started_cluster.postgres_port,
                             database=True)
    cursor = conn.cursor()
    NUM_TABLES = 5

    for i in range(NUM_TABLES):
        table_name = 'postgresql_replica_{}'.format(i)
        create_postgres_table(cursor, table_name);
        instance.query("INSERT INTO postgres_database.{} SELECT number, number from numbers(100000)".format(table_name))

    create_materialized_db(ip=started_cluster.postgres_ip, port=started_cluster.postgres_port)
    time.sleep(0.5)
    instance.restart_clickhouse()
    for i in range(NUM_TABLES):
        check_tables_are_synchronized('postgresql_replica_{}'.format(i));

    drop_materialized_db()
    for i in range(NUM_TABLES):
        cursor.execute('drop table postgresql_replica_{};'.format(i))


def test_abrupt_server_restart_while_heavy_replication(started_cluster):
    drop_materialized_db()
    conn = get_postgres_conn(ip=started_cluster.postgres_ip,
                             port=started_cluster.postgres_port,
                             database=True)
    cursor = conn.cursor()
    NUM_TABLES = 6

    for i in range(NUM_TABLES):
        create_postgres_table(cursor, 'postgresql_replica_{}'.format(i));

    def transaction(thread_id):
        if thread_id % 2:
            conn = get_postgres_conn(ip=started_cluster.postgres_ip,
                                    port=started_cluster.postgres_port,
                                    database=True, auto_commit=True)
        else:
            conn = get_postgres_conn(ip=started_cluster.postgres_ip,
                                    port=started_cluster.postgres_port,
                                    database=True, auto_commit=False)
        cursor_ = conn.cursor()
        for query in queries:
            cursor_.execute(query.format(thread_id))
            print('thread {}, query {}'.format(thread_id, query))
        if thread_id % 2 == 0:
            conn.commit()

    threads = []
    threads_num = 6
    for i in range(threads_num):
        threads.append(threading.Thread(target=transaction, args=(i,)))

    create_materialized_db(ip=started_cluster.postgres_ip,
                           port=started_cluster.postgres_port)

    for thread in threads:
        time.sleep(random.uniform(0, 0.5))
        thread.start()

    # Join here because it takes time for data to reach wal
    for thread in threads:
        thread.join()
    instance.restart_clickhouse()

    for i in range(NUM_TABLES):
        result = instance.query("SELECT count() FROM test_database.postgresql_replica_{}".format(i))
        print(result) # Just debug

    for i in range(NUM_TABLES):
        check_tables_are_synchronized('postgresql_replica_{}'.format(i));

    for i in range(NUM_TABLES):
        result = instance.query("SELECT count() FROM test_database.postgresql_replica_{}".format(i))
        print(result) # Just debug

    drop_materialized_db()
    for i in range(NUM_TABLES):
        cursor.execute('drop table if exists postgresql_replica_{};'.format(i))


def test_quoting(started_cluster):
    table_name = 'user'
    conn = get_postgres_conn(ip=started_cluster.postgres_ip,
                             port=started_cluster.postgres_port,
                             database=True)
    cursor = conn.cursor()
    create_postgres_table(cursor, table_name);
    instance.query("INSERT INTO postgres_database.{} SELECT number, number from numbers(50)".format(table_name))
    create_materialized_db(ip=started_cluster.postgres_ip, port=started_cluster.postgres_port)
    check_tables_are_synchronized(table_name);
    drop_postgres_table(cursor, table_name)
    drop_materialized_db()


def test_user_managed_slots(started_cluster):
    conn = get_postgres_conn(ip=started_cluster.postgres_ip,
                             port=started_cluster.postgres_port,
                             database=True)
    cursor = conn.cursor()
    table_name = 'test_table'
    create_postgres_table(cursor, table_name);
    instance.query("INSERT INTO postgres_database.{} SELECT number, number from numbers(10000)".format(table_name))

    slot_name = 'user_slot'
    replication_connection = get_postgres_conn(ip=started_cluster.postgres_ip, port=started_cluster.postgres_port,
                                               database=True, replication=True, auto_commit=True)
    snapshot = create_replication_slot(replication_connection, slot_name=slot_name)
    create_materialized_db(ip=started_cluster.postgres_ip,
                           port=started_cluster.postgres_port,
                           settings=["materialized_postgresql_replication_slot = '{}'".format(slot_name),
                                     "materialized_postgresql_snapshot = '{}'".format(snapshot)])
    check_tables_are_synchronized(table_name);
    instance.query("INSERT INTO postgres_database.{} SELECT number, number from numbers(10000, 10000)".format(table_name))
    check_tables_are_synchronized(table_name);
    instance.restart_clickhouse()
    instance.query("INSERT INTO postgres_database.{} SELECT number, number from numbers(20000, 10000)".format(table_name))
    check_tables_are_synchronized(table_name);
    drop_postgres_table(cursor, table_name)
    drop_materialized_db()
    drop_replication_slot(replication_connection, slot_name)
    cursor.execute('DROP TABLE IF EXISTS test_table')


def test_add_new_table_to_replication(started_cluster):
    drop_materialized_db()
    conn = get_postgres_conn(ip=started_cluster.postgres_ip,
                             port=started_cluster.postgres_port,
                             database=True)
    cursor = conn.cursor()
    NUM_TABLES = 5

    for i in range(NUM_TABLES):
        create_postgres_table(cursor, 'postgresql_replica_{}'.format(i));
        instance.query("INSERT INTO postgres_database.postgresql_replica_{} SELECT number, {} from numbers(10000)".format(i, i))

    create_materialized_db(ip=started_cluster.postgres_ip,
                           port=started_cluster.postgres_port)

    for i in range(NUM_TABLES):
        table_name = 'postgresql_replica_{}'.format(i)
        check_tables_are_synchronized(table_name);

    result = instance.query("SHOW TABLES FROM test_database")
    assert(result == "postgresql_replica_0\npostgresql_replica_1\npostgresql_replica_2\npostgresql_replica_3\npostgresql_replica_4\n")

    table_name = 'postgresql_replica_5'
    create_postgres_table(cursor, table_name)
    instance.query("INSERT INTO postgres_database.{} SELECT number, number from numbers(10000)".format(table_name))

    result = instance.query('SHOW CREATE DATABASE test_database')
    assert(result[:63] == "CREATE DATABASE test_database\\nENGINE = MaterializedPostgreSQL(") # Check without ip
    assert(result[-59:] == "\\'postgres_database\\', \\'postgres\\', \\'mysecretpassword\\')\n")

    result = instance.query_and_get_error("ALTER DATABASE test_database MODIFY SETTING materialized_postgresql_tables_list='tabl1'")
    assert('Changing setting `materialized_postgresql_tables_list` is not allowed' in result)

    result = instance.query_and_get_error("ALTER DATABASE test_database MODIFY SETTING materialized_postgresql_tables='tabl1'")
    assert('Database engine MaterializedPostgreSQL does not support setting' in result)

    instance.query("ATTACH TABLE test_database.{}".format(table_name));

    result = instance.query("SHOW TABLES FROM test_database")
    assert(result == "postgresql_replica_0\npostgresql_replica_1\npostgresql_replica_2\npostgresql_replica_3\npostgresql_replica_4\npostgresql_replica_5\n")

    check_tables_are_synchronized(table_name);
    instance.query("INSERT INTO postgres_database.{} SELECT number, number from numbers(10000, 10000)".format(table_name))
    check_tables_are_synchronized(table_name);

    result = instance.query_and_get_error("ATTACH TABLE test_database.{}".format(table_name));
    assert('Table test_database.postgresql_replica_5 already exists' in result)

    result = instance.query_and_get_error("ATTACH TABLE test_database.unknown_table");
    assert('PostgreSQL table unknown_table does not exist' in result)

    result = instance.query('SHOW CREATE DATABASE test_database')
    assert(result[:63] == "CREATE DATABASE test_database\\nENGINE = MaterializedPostgreSQL(")
    assert(result[-180:] == ")\\nSETTINGS materialized_postgresql_tables_list = \\'postgresql_replica_0,postgresql_replica_1,postgresql_replica_2,postgresql_replica_3,postgresql_replica_4,postgresql_replica_5\\'\n")

    table_name = 'postgresql_replica_6'
    create_postgres_table(cursor, table_name)
    instance.query("INSERT INTO postgres_database.{} SELECT number, number from numbers(10000)".format(table_name))
    instance.query("ATTACH TABLE test_database.{}".format(table_name));

    instance.restart_clickhouse()

    table_name = 'postgresql_replica_7'
    create_postgres_table(cursor, table_name)
    instance.query("INSERT INTO postgres_database.{} SELECT number, number from numbers(10000)".format(table_name))
    instance.query("ATTACH TABLE test_database.{}".format(table_name));

    result = instance.query('SHOW CREATE DATABASE test_database')
    assert(result[:63] == "CREATE DATABASE test_database\\nENGINE = MaterializedPostgreSQL(")
    assert(result[-222:] == ")\\nSETTINGS materialized_postgresql_tables_list = \\'postgresql_replica_0,postgresql_replica_1,postgresql_replica_2,postgresql_replica_3,postgresql_replica_4,postgresql_replica_5,postgresql_replica_6,postgresql_replica_7\\'\n")

    result = instance.query("SHOW TABLES FROM test_database")
    assert(result == "postgresql_replica_0\npostgresql_replica_1\npostgresql_replica_2\npostgresql_replica_3\npostgresql_replica_4\npostgresql_replica_5\npostgresql_replica_6\npostgresql_replica_7\n")

    for i in range(NUM_TABLES + 3):
        table_name = 'postgresql_replica_{}'.format(i)
        check_tables_are_synchronized(table_name);

    for i in range(NUM_TABLES + 3):
        cursor.execute('drop table if exists postgresql_replica_{};'.format(i))


def test_remove_table_from_replication(started_cluster):
    drop_materialized_db()
    conn = get_postgres_conn(ip=started_cluster.postgres_ip,
                             port=started_cluster.postgres_port,
                             database=True)
    cursor = conn.cursor()
    NUM_TABLES = 5

    for i in range(NUM_TABLES):
        create_postgres_table(cursor, 'postgresql_replica_{}'.format(i));
        instance.query("INSERT INTO postgres_database.postgresql_replica_{} SELECT number, {} from numbers(10000)".format(i, i))

    create_materialized_db(ip=started_cluster.postgres_ip,
                           port=started_cluster.postgres_port)

    for i in range(NUM_TABLES):
        table_name = 'postgresql_replica_{}'.format(i)
        check_tables_are_synchronized(table_name);

    result = instance.query("SHOW TABLES FROM test_database")
    assert(result == "postgresql_replica_0\npostgresql_replica_1\npostgresql_replica_2\npostgresql_replica_3\npostgresql_replica_4\n")

    result = instance.query('SHOW CREATE DATABASE test_database')
    assert(result[:63] == "CREATE DATABASE test_database\\nENGINE = MaterializedPostgreSQL(")
    assert(result[-59:] == "\\'postgres_database\\', \\'postgres\\', \\'mysecretpassword\\')\n")

    table_name = 'postgresql_replica_4'
    instance.query('DETACH TABLE test_database.{}'.format(table_name));
    result = instance.query_and_get_error('SELECT * FROM test_database.{}'.format(table_name))
    assert("doesn't exist" in result)

    result = instance.query("SHOW TABLES FROM test_database")
    assert(result == "postgresql_replica_0\npostgresql_replica_1\npostgresql_replica_2\npostgresql_replica_3\n")

    result = instance.query('SHOW CREATE DATABASE test_database')
    assert(result[:63] == "CREATE DATABASE test_database\\nENGINE = MaterializedPostgreSQL(")
    assert(result[-138:] == ")\\nSETTINGS materialized_postgresql_tables_list = \\'postgresql_replica_0,postgresql_replica_1,postgresql_replica_2,postgresql_replica_3\\'\n")

    instance.query('ATTACH TABLE test_database.{}'.format(table_name));
    check_tables_are_synchronized(table_name);

    for i in range(NUM_TABLES):
        table_name = 'postgresql_replica_{}'.format(i)
        check_tables_are_synchronized(table_name);

    result = instance.query('SHOW CREATE DATABASE test_database')
    assert(result[:63] == "CREATE DATABASE test_database\\nENGINE = MaterializedPostgreSQL(")
    assert(result[-159:] == ")\\nSETTINGS materialized_postgresql_tables_list = \\'postgresql_replica_0,postgresql_replica_1,postgresql_replica_2,postgresql_replica_3,postgresql_replica_4\\'\n")

    table_name = 'postgresql_replica_1'
    instance.query('DETACH TABLE test_database.{}'.format(table_name));
    result = instance.query('SHOW CREATE DATABASE test_database')
    assert(result[:63] == "CREATE DATABASE test_database\\nENGINE = MaterializedPostgreSQL(")
    assert(result[-138:] == ")\\nSETTINGS materialized_postgresql_tables_list = \\'postgresql_replica_0,postgresql_replica_2,postgresql_replica_3,postgresql_replica_4\\'\n")

    for i in range(NUM_TABLES):
        cursor.execute('drop table if exists postgresql_replica_{};'.format(i))


def test_predefined_connection_configuration(started_cluster):
    drop_materialized_db()
    conn = get_postgres_conn(ip=started_cluster.postgres_ip, port=started_cluster.postgres_port, database=True)
    cursor = conn.cursor()
    cursor.execute(f'DROP TABLE IF EXISTS test_table')
    cursor.execute(f'CREATE TABLE test_table (key integer PRIMARY KEY, value integer)')

    instance.query("CREATE DATABASE test_database ENGINE = MaterializedPostgreSQL(postgres1)")
    check_tables_are_synchronized("test_table");
    drop_materialized_db()
    cursor.execute('DROP TABLE IF EXISTS test_table')


if __name__ == '__main__':
    cluster.start()
    input("Cluster created, press any key to destroy...")
    cluster.shutdown()