nishantmonu51 commented on a change in pull request #5958: Part 2 of changes 
for SQL Compatible Null Handling
URL: https://github.com/apache/incubator-druid/pull/5958#discussion_r204795900
 
 

 ##########
 File path: 
processing/src/main/java/io/druid/query/aggregation/first/FloatFirstAggregatorFactory.java
 ##########
 @@ -32,19 +32,21 @@
 import io.druid.query.aggregation.AggregatorFactory;
 import io.druid.query.aggregation.AggregatorUtil;
 import io.druid.query.aggregation.BufferAggregator;
+import io.druid.query.aggregation.NullableAggregatorFactory;
 import io.druid.query.monomorphicprocessing.RuntimeShapeInspector;
-import io.druid.segment.BaseObjectColumnValueSelector;
 import io.druid.segment.ColumnSelectorFactory;
+import io.druid.segment.ColumnValueSelector;
 import io.druid.segment.column.Column;
 
+import javax.annotation.Nullable;
 import java.nio.ByteBuffer;
 import java.util.Arrays;
 import java.util.Comparator;
 import java.util.List;
 import java.util.Map;
 import java.util.Objects;
 
-public class FloatFirstAggregatorFactory extends AggregatorFactory
+public class FloatFirstAggregatorFactory extends 
NullableAggregatorFactory<ColumnValueSelector>
 
 Review comment:
   not a blocker for this PR, would like to do it a follow up PR - 
https://github.com/apache/incubator-druid/issues/6039

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