ple, <code class="command">SELECT</code>
   is allowed unless it contains an <code class="literal">INTO</code> clause, and
   <code class="command">UPDATE</code> is allowed only if it contains a <code class="literal">RETURNING</code>
   clause.
  </p></div><div class="refsect1" id="id-1.8.12.8.14.6"><h2>Arguments</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><code class="literal">SPIPlanPtr <em class="parameter"><code>plan</code></em></code></span></dt><dd><p>
      prepared 