suneet-s commented on a change in pull request #9161: first/last aggregators 
and nulls
URL: https://github.com/apache/druid/pull/9161#discussion_r368727641
 
 

 ##########
 File path: 
processing/src/test/java/org/apache/druid/query/aggregation/first/DoubleFirstAggregationTest.java
 ##########
 @@ -30,14 +30,16 @@
 import org.apache.druid.query.aggregation.TestObjectColumnSelector;
 import org.apache.druid.segment.ColumnSelectorFactory;
 import org.apache.druid.segment.column.ColumnHolder;
+import org.apache.druid.testing.InitializedNullHandlingTest;
 import org.easymock.EasyMock;
 import org.junit.Assert;
 import org.junit.Before;
 import org.junit.Test;
 
 import java.nio.ByteBuffer;
+import java.util.Comparator;
 
-public class DoubleFirstAggregationTest
+public class DoubleFirstAggregationTest extends InitializedNullHandlingTest
 
 Review comment:
   it looks like these tests will only check `useDefaultValuesForNull = true` 
or is there some config I'm not seeing that sets it to `false` as well in 
another run?

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