/code>.</p>
<p>This is an awkward suggestion, because if you knew how many rows there were, we wouldn’t be having this conversation in the first place. But sometimes you have a decent estimate and can choose a value of <code>guess_max</code> that is “big enough”. This usually results in much better performance than <code>guess_max = Inf</code>.</p>
<div class="sourceCode" id="cb7"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb7-1"><a href="#cb7-1" aria-hidden="true" tabindex="-1"></