long&nbsp;nRows,
              java.lang.Object&nbsp;statName)</code>
<div class="block">Return a reducer which will probabilistically sample the source column producing at most nRows and then call descriptiveStatistics on it with statName.</div>
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<td class="colFirst"><code>static java.lang.Object</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../tech/v3/dataset/Reductions.html#rowCount-java.lang.Object-">rowCount</a></span>(java.l