priyen commented on code in PR #10926:
URL: https://github.com/apache/pinot/pull/10926#discussion_r1252422716


##########
pinot-segment-local/src/main/java/org/apache/pinot/segment/local/aggregator/DistinctCountHLLValueAggregator.java:
##########
@@ -100,6 +124,9 @@ public byte[] serializeAggregatedValue(HyperLogLog value) {
 
   @Override
   public HyperLogLog deserializeAggregatedValue(byte[] bytes) {
+    if (bytes == null || bytes.length == 0) {
+      return new HyperLogLog(_log2m);
+    }

Review Comment:
   deserializeAggregatedValue is often called in getInitialAggregatedValue of 
some of the implementations (not just HLL or sum precision), one example is in 
AvgValueAggregator when the input is of type bytes, so to cover that case, I 
also do it here



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