Akshat-Jain commented on code in PR #16682:
URL: https://github.com/apache/druid/pull/16682#discussion_r1674132300


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processing/src/main/java/org/apache/druid/query/aggregation/hyperloglog/HyperUniquesAggregatorFactory.java:
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@@ -137,17 +137,21 @@ public VectorAggregator factorizeVector(final 
VectorColumnSelectorFactory select
 
   /**
    * Validates whether the aggregator supports the input column type.
+   * Supported column types are complex types of hyperUnique, 
preComputedHyperUnique, as well as UNKNOWN_COMPLEX.

Review Comment:
   My bad, makes sense. I've moved the validateInputs() check to a later point, 
such that the NoopXyz.instance() are returned like previously. Have also added 
a basic test to validate the NoopXyz.instance() flows for factorize methods of 
this class.



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