ege-st commented on code in PR #12334:
URL: https://github.com/apache/pinot/pull/12334#discussion_r1470170103


##########
pinot-server/src/main/java/org/apache/pinot/server/api/resources/TablesResource.java:
##########
@@ -283,9 +284,17 @@ public String getSegmentMetadata(
       }
     }
 
+    // fetch partition to primary key count for realtime tables that have 
upsert enabled
+    Map<Integer, Long> upsertPartitionToPrimaryKeyCountMap = new HashMap<>();
+    if (tableDataManager instanceof RealtimeTableDataManager) {
+      RealtimeTableDataManager realtimeTableDataManager = 
(RealtimeTableDataManager) tableDataManager;
+      upsertPartitionToPrimaryKeyCountMap = 
realtimeTableDataManager.getUpsertPartitionToPrimaryKeyCount();
+    }
+
     TableMetadataInfo tableMetadataInfo =
         new TableMetadataInfo(tableDataManager.getTableName(), 
totalSegmentSizeBytes, segmentDataManagers.size(),
-            totalNumRows, columnLengthMap, columnCardinalityMap, 
maxNumMultiValuesMap, columnIndexSizesMap);
+            totalNumRows, columnLengthMap, columnCardinalityMap, 
maxNumMultiValuesMap, columnIndexSizesMap,
+            upsertPartitionToPrimaryKeyCountMap);

Review Comment:
   Is there anything to worry about with compatibility by adding a new field to 
the response message?



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