;, 1.0),
                                                      &quot;count&quot;,         Reductions.sum(&quot;count&quot;)),
                                              null);
//Take a million row dataset, expand it, then perform two grouping aggregations.
println(head(result));
//[&quot;placement&quot; &quot;year-month&quot;]-aggregation [5 10]:

//| q3-count | median-count | min-count | high-95-count | placement | max-count |   count | low-95-count | q1-count | year-month |
//|---------:|-------------: