title: Can I delete the detached folder on clickhouse data
body: <p>There are many <code>ignored</code> folder in the detached, and take up too many spaces, can I remove it?</p>
  <pre class="lang-sh prettyprint-override"><code>[root@cl1-data4 billing_test]# du -h --max-depth=1 ./tb_pay_order_log_local/
  40G     ./tb_pay_order_log_local/detached
  </code></pre>