clintropolis commented on a change in pull request #6951: Add more sketch 
aggregator support in Druid SQL
URL: https://github.com/apache/incubator-druid/pull/6951#discussion_r252039199
 
 

 ##########
 File path: 
extensions-core/datasketches/src/main/java/org/apache/druid/query/aggregation/datasketches/hll/HllSketchModule.java
 ##########
 @@ -57,6 +59,11 @@ public void configure(final Binder binder)
     if (ComplexMetrics.getSerdeForType(MERGE_TYPE_NAME) == null) {
       ComplexMetrics.registerSerde(MERGE_TYPE_NAME, new 
HllSketchMergeComplexMetricSerde());
     }
+
+    if (binder != null) {
 
 Review comment:
   It's possible to not need this if check by doing something like 
[this](https://github.com/apache/incubator-druid/pull/6950/files#diff-dbabe3c8d0b963a928eac3cef360880bR99)
 and using an injector

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