 of the <code class="structname">measurement</code> table. With
    partition pruning enabled, the planner will examine the definition
    of each partition and prove that the partition need not
    be scanned because it could not contain any rows meeting the query's
    <code class="literal">WHERE</code> clause.  When the planner can prove this, it
    excludes (<em class="firstterm">prunes</em>) the partition from the query
    plan.
   </p><p>
    By using the EXPLAIN command and the <a class="xref" href