LindaSummer commented on code in PR #2811:
URL: https://github.com/apache/kvrocks/pull/2811#discussion_r1976929785


##########
src/types/redis_tdigest.cc:
##########
@@ -161,6 +161,8 @@ rocksdb::Status TDigest::Add(engine::Context& ctx, const 
Slice& digest_name, con
 
   metadata.total_observations += inputs.size();
   metadata.total_weight += inputs.size();
+  metadata.maximum = std::max(metadata.maximum, 
*std::max_element(inputs.cbegin(), inputs.cend()));

Review Comment:
   Hi @wyxxxcat ,
   
   The `metadata.minimum` and `metadata.maximum` should represent the centroids 
min and max.
   It will be updated in [merge 
action](https://github.com/apache/kvrocks/blob/34007db3a5a74e7c773209a16c6d0a5cc09ef884/src/types/tdigest.cc#L238)
 and updated by [dumping after 
merging](https://github.com/apache/kvrocks/blob/34007db3a5a74e7c773209a16c6d0a5cc09ef884/src/types/tdigest.cc#L393).
   
   Maybe we could just compute inplace or create a new property in metadata or 
do a merge to keep the conaistency of metadata and centroids. 😊



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