    <p>
       Maximum time spent planning the statement, in milliseconds
       (if <code class="varname">pg_stat_statements.track_planning</code> is enabled,
       otherwise zero)
      </p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
       <code class="structfield">mean_plan_time</code> <code class="type">double precision</code>
      </p>
      <p>
       Mean time spent planning the statement, in milliseconds
       (if <code class="varname">pg_stat_statements.track_pla