ll <code class="structfield">query</code> fields, though the statistics associated with
   each <code class="structfield">queryid</code> are preserved.  If this happens, consider
   reducing <code class="varname">pg_stat_statements.max</code> to prevent
   recurrences.
  </p><p>
   <code class="structfield">plans</code> and <code class="structfield">calls</code> aren't
   always expected to match because planning and execution statistics are
   updated at their respective end phase, and only for successful 