Jackie-Jiang commented on code in PR #16552:
URL: https://github.com/apache/pinot/pull/16552#discussion_r2264078860


##########
pinot-segment-local/src/main/java/org/apache/pinot/segment/local/aggregator/CountValueAggregator.java:
##########
@@ -36,7 +37,7 @@ public DataType getAggregatedValueType() {
   }
 
   @Override
-  public Long getInitialAggregatedValue(Object rawValue) {
+  public Long getInitialAggregatedValue(@Nullable Object rawValue) {

Review Comment:
   Decided to go with correct SQL semantic, where `null` is not counted if the 
source is a column



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