n class="k">return</span> <span class="bp">self</span>
    <span class="k">else</span><span class="p">:</span>
        <span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">materialized</span><span class="p">:</span>
            <span class="n">df</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_get_materialized_df</span><span class="p">()</span><span class="o">.</span><span class="n">drop</span><span class="p">(</sp