Jackie-Jiang commented on code in PR #10915:
URL: https://github.com/apache/pinot/pull/10915#discussion_r1262987390


##########
pinot-segment-local/src/main/java/org/apache/pinot/segment/local/upsert/BasePartitionUpsertMetadataManager.java:
##########
@@ -367,6 +398,17 @@ public void replaceSegment(ImmutableSegment segment, 
@Nullable ThreadSafeMutable
     Lock segmentLock = SegmentLocks.getSegmentLock(_tableNameWithType, 
segmentName);
     segmentLock.lock();
     try {
+      // Skip adding segments that has segment EndTime in the comparison cols 
earlier than (largestSeenTimestamp - TTL).
+      // Note: We only update largestSeenComparisonValue when addRecord, and 
access the value when addOrReplaceSegments.
+      // We only support single comparison column for TTL-enabled upsert 
tables.
+      if (_largestSeenComparisonValue > 0) {

Review Comment:
   This code path is invoked during segment reload also, so we need to consider 
that as well



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