
       are included in the definitions of foreign tables imported
       from a foreign server. The default is <code class="literal">true</code>.
       The <code class="command">IMPORT</code> will fail altogether if an imported generated
       expression uses a function or operator that does not exist locally.
      </p></dd><dt><span class="term"><code class="literal">import_not_null</code> (<code class="type">boolean</code>)</span></dt><dd><p>
       This option controls whether column <code class="lit