ClickHouse/tests/integration/test_dictionary_custom_settings/configs/dictionaries/ClickHouseSourceConfig.xml

<clickhouse>
    <dictionary>
        <name>test_clickhouse</name>
        
        <source>
            <clickhouse>
                <host>localhost</host>
                <port>9000</port>
                <user>default</user>
                <password></password>
                <db>default</db>
                <table>source</table>
            </clickhouse>

            <settings>
                <max_result_bytes>1</max_result_bytes>
            </settings>

        </source>
		
        <lifetime>600</lifetime>

        <layout>
            <flat/>
        </layout>

        <structure>
            <id>
                <name>id</name>
            </id>
            <attribute>
                <name>first</name>
                <type>String</type>
                <null_value></null_value>
            </attribute>
            <attribute>
                <name>second</name>
                <type>String</type>
                <null_value></null_value>
            </attribute>
            <attribute>
                <name>third</name>
                <type>String</type>
                <null_value></null_value>
            </attribute>
        </structure>
    </dictionary>
</clickhouse>