t&nbsp;colname)</pre>
<div class="block"><p>Returns a distinct reducer returns the number of distinct elements.</p></div>
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<h4>setCardinalityUint32</h4>
<pre>public static&nbsp;java.lang.Object&nbsp;setCardinalityUint32(java.lang.Object&nbsp;colname)</pre>
<div class="block"><p>Returns a distinct reducer that expects unsigned integer values and returns the number of distinct elements. T