title: how to sort a table in alphabetical order with antd
body: <p>I want to filter the column in alphabetical order
  here is the code to filter by the size
  how to do
  thank you</p>
  
  <pre class="lang-js prettyprint-override"><code>const columns = [{
        title: 'First Name',
        dataIndex: 'first_name',
        sortDirections: ['descend', 'ascend'],
        key: 'first_name',
        width: '20%',
        sorter: (a, b) =&gt; a.first_name.length - b.first_name.length,
  
      }]
  </code></pre>