asdf2014 commented on code in PR #15162:
URL: https://github.com/apache/druid/pull/15162#discussion_r1379671744
##########
extensions-core/datasketches/src/main/java/org/apache/druid/query/aggregation/datasketches/hll/HllSketchToEstimatePostAggregator.java:
##########
@@ -97,7 +97,11 @@ public Comparator<Double> getComparator()
@Override
public Object compute(final Map<String, Object> combinedAggregators)
{
- final HllSketchHolder holder =
HllSketchHolder.fromObj(field.compute(combinedAggregators));
+ Object hllSketchHolderObject = field.compute(combinedAggregators);
+ if (hllSketchHolderObject == null) {
+ return 0.0d;
Review Comment:
```suggestion
return 0.0D;
```
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