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<h4>groupByColumnsAgg</h4>
<pre>public static&nbsp;java.util.Map&nbsp;groupByColumnsAgg(java.lang.Iterable&nbsp;dsSeq,
                                              java.lang.Object&nbsp;colname,
                                              java.util.Map&nbsp;aggMap,
                                              java.util.Map&nbsp;options)</pre>
<div class="block"><p>Group a sequence of datasets by column or columns an in the process perform an aggregation. T