rohityadav1993 commented on code in PR #11983:
URL: https://github.com/apache/pinot/pull/11983#discussion_r1552936971


##########
pinot-segment-local/src/main/java/org/apache/pinot/segment/local/upsert/BaseTableUpsertMetadataManager.java:
##########
@@ -61,11 +62,12 @@ public void init(TableConfig tableConfig, Schema schema, 
TableDataManager tableD
     PartialUpsertHandler partialUpsertHandler = null;
     if (upsertConfig.getMode() == UpsertConfig.Mode.PARTIAL) {
       Map<String, UpsertConfig.Strategy> partialUpsertStrategies = 
upsertConfig.getPartialUpsertStrategies();
-      Preconditions.checkArgument(partialUpsertStrategies != null,
+      String rowMergerCustomImplementation = 
upsertConfig.getPartialUpsertMergerClass();
+      Preconditions.checkArgument(
+          StringUtils.isNotBlank(rowMergerCustomImplementation) || 
partialUpsertStrategies != null,

Review Comment:
   Got it, thank you Jackie.



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