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<h4>reservoirStats</h4>
<pre>public static&nbsp;java.lang.Object&nbsp;reservoirStats(java.lang.Object&nbsp;colname,
                                              long&nbsp;nRows,
                                              java.lang.Object&nbsp;statName)</pre>
<div class="block"><p>Return a reducer which will probabilistically sample the source column producing at most nRows and then call descriptiveStatistics on it with statName.</p>
<p>Stat names are described in tec