rop columns. </span>
<span class="sd">    This is implemented in Quokka as selecting the columns in the DataStream&#39;s schema that are not dropped.</span>

<span class="sd">    Args:</span>
<span class="sd">        cols_to_drop (list): a list of columns to drop from the source DataStream</span>

<span class="sd">    Return:</span>
<span class="sd">        A DataStream consisting of all columns in the source DataStream that are not in `cols_to_drop`.</span>

<span class="sd">    Examples:</span>
<span clas