TRESULT"><code class="function">PQgetResult</code></a> returns a null pointer.
       Similarly a <code class="literal">PGRES_COPY_IN</code> result is processed
       by a series of <a class="xref" href="libpq-copy.html#LIBPQ-PQPUTLINE"><code class="function">PQputline</code></a> calls followed by
       <a class="xref" href="libpq-copy.html#LIBPQ-PQENDCOPY"><code class="function">PQendcopy</code></a>, then return to the
       <a class="xref" href="libpq-async.html#LIBPQ-PQGETRESULT"><code class="function