ClickHouse/tests/integration/test_distributed_ddl_parallel/configs/dict.xml

<?xml version="1.0"?>
<yandex>
   <dictionary>
      <name>slow_dict</name>
      <source>
         <executable>
             <command>sleep 7</command>
             <format>TabSeparated</format>
         </executable>
      </source>
      <layout>
         <flat/>
      </layout>
      <structure>
         <id>
            <name>id</name>
         </id>
         <attribute>
            <name>value</name>
            <type>String</type>
            <null_value></null_value>
         </attribute>
      </structure>
      <lifetime>0</lifetime>
  </dictionary>
</yandex>