c static&nbsp;java.lang.Object&nbsp;distinctUInt32(java.lang.Object&nbsp;colname)</pre>
<div class="block"><p>Returns a distinct reducer that produces a roaringbitmap of distinct values. This is many times faster than the distinct reducer if your data fits into unsigned int32 space.</p></div>
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<h4>setCardinality</h4>
<pre>public static&nbsp;java.lang.Object&nbsp;setCardinality(java.lang.Objec