>:</span> <span class="n">col</span><span class="p">}</span> <span class="k">for</span> <span class="n">col</span> <span class="ow">in</span> <span class="n">new_schema</span><span class="p">},</span>
        <span class="n">required_columns</span><span class="o">=</span><span class="p">{</span><span class="mi">0</span><span class="p">:</span> <span class="n">required_columns</span><span class="p">},</span>
        <span class="n">operator</span><span class="o">=</span><span class="n">executor</span>
    <s