at query planning time, not at run time. As a result,
   parameterized query clauses do not work with a partial index. For
   example a prepared query with a parameter might specify
   <span class="quote">“<span class="quote">x &lt; ?</span>”</span> which will never imply
   <span class="quote">“<span class="quote">x &lt; 2</span>”</span> for all possible values of the parameter.
  </p><p>
   A third possible use for partial indexes does not require the
   index to be used in queries at all.  The id