vvivekiyer commented on code in PR #12347:
URL: https://github.com/apache/pinot/pull/12347#discussion_r1473959548


##########
pinot-core/src/main/java/org/apache/pinot/core/query/aggregation/function/DistinctCountThetaSketchAggregationFunction.java:
##########
@@ -1024,7 +1024,8 @@ public Comparable 
extractFinalResult(List<ThetaSketchAccumulator> accumulators)
     int numAccumulators = accumulators.size();
     List<Sketch> mergedSketches = new ArrayList<>(numAccumulators);
 
-    for (ThetaSketchAccumulator accumulator : accumulators) {
+    for (Object accumulatorObject : accumulators) {

Review Comment:
   Please make this change in 
`DistinctCountRawThetaSketchAggregationFunction.extractFinalResult()` to ensure 
backward compatibility.



##########
pinot-core/src/main/java/org/apache/pinot/core/query/aggregation/function/DistinctCountThetaSketchAggregationFunction.java:
##########
@@ -1024,7 +1024,8 @@ public Comparable 
extractFinalResult(List<ThetaSketchAccumulator> accumulators)
     int numAccumulators = accumulators.size();
     List<Sketch> mergedSketches = new ArrayList<>(numAccumulators);
 
-    for (ThetaSketchAccumulator accumulator : accumulators) {
+    for (Object accumulatorObject : accumulators) {
+      ThetaSketchAccumulator accumulator = 
convertSketchAccumulator(accumulatorObject);

Review Comment:
   (Not related to your code) Consider reusing convertSketchAccumulator() 
function  in L980 to avoid code duplication. 



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