itschrispeck commented on code in PR #15685:
URL: https://github.com/apache/pinot/pull/15685#discussion_r2105238509
##########
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:
I don't see this being an issue in profiling - in our logging use case we
often see multibyte chars and the additional accuracy is helpful
<img width="500" alt="image"
src="https://github.com/user-attachments/assets/4802c472-af5a-4a3c-bae1-86cf6c737d4b";
/>
normalized to compare cost against just the calling MutableJsonIndex.add
method, it consists of .15% of samples for high cardinality ingestion/worst
case scenario (lots of new keys requiring the call)
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