e8c8ff
@@ -309,6 +309,8 @@
public void merge(AggregationBuffer agg, Object partial) throws HiveException {
           myagg.quantiles[i-1] = doi.get(partialHistogram.get(i));
         }
         partialHistogram.subList(0, nquantiles+1).clear();
+      } else {
+        partialHistogram.subList(0, 1).clear();
       }
 
       // merge histograms
