ClickHouse/tests/integration/test_materialize_mysql_database/configs/users.xml

<?xml version="1.0"?>
<yandex>
    <profiles>
        <default>
            <allow_experimental_database_materialize_mysql>1</allow_experimental_database_materialize_mysql>
        </default>
    </profiles>

    <users>
        <default>
            <password></password>
            <networks incl="networks" replace="replace">
                <ip>::/0</ip>
            </networks>
            <profile>default</profile>
        </default>
    </users>
</yandex>