ClickHouse/tests/integration/test_async_load_databases/configs/dictionaries/node.xml

<clickhouse>
    <dictionary>
        <name>node</name>
        <source>
            <clickhouse>
                <host>localhost</host>
                <port>9000</port>
                <user>default</user>
                <password></password>
                <db>system</db>
                <query>select dummy, toString(dummy) from system.one</query>
            </clickhouse>
        </source>
        <lifetime>0</lifetime>
        <layout><flat /></layout>
        <structure>
            <id><name>key</name></id>
            <attribute>
                <name>name</name>
                <type>String</type>
                <null_value></null_value>
            </attribute>
        </structure>
    </dictionary>
</clickhouse>