Jackie-Jiang commented on code in PR #15685:
URL: https://github.com/apache/pinot/pull/15685#discussion_r2112938348


##########
pinot-segment-local/src/main/java/org/apache/pinot/segment/local/realtime/impl/json/MutableJsonIndexImpl.java:
##########
@@ -117,9 +131,15 @@ private void addFlattenedRecords(List<Map<String, String>> 
records) {
       for (Map.Entry<String, String> entry : record.entrySet()) {
         // Put both key and key-value into the posting list. Key is useful for 
checking if a key exists in the json.
         String key = entry.getKey();
-        _postingListMap.computeIfAbsent(key, k -> new 
RoaringBitmap()).add(_nextFlattenedDocId);
+        _postingListMap.computeIfAbsent(key, k -> {
+          _bytesSize += Utf8.encodedLength(key);

Review Comment:
   UTF-8 encoding length is the size on disk, not on heap though. This is not a 
blocking comment



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