ang.Object&nbsp;colname)</code>
<div class="block">Returns a rowCount reducer that returns the number of source rows aggregated.</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#setCardinality-java.lang.Object-">setCardinality</a></span>(java.lang.Object&nbsp;colname)</code>
<div class="block">Returns a distinct reducer returns the number of 