code>, and expose the <code>execute</code> 
and <code>done</code> functions. More details forthcoming.</p></td>
          <td>
              <em>required</em>
          </td>
        </tr>
        <tr>
          <td><code>new_schema</code></td>
          <td>
                <code>list</code>
          </td>
          <td><p>The names of the columns of the Polars DataFrame that the transformation function produces. </p></td>
          <td>
              <em>required</em>
          </td>
        </tr>
      