n</a>&nbsp;expr)</pre>
<div class="block">Add a filter to match files to delete. A file will be deleted if all of the rows it contains
 match this or any other filter passed to this method.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>expr</code> - an expression to match rows.</dd>
</dl>
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<h4>dropPartition</h4>
<pre>protected&nbsp;void&nbsp;dropPartit