nsivabalan commented on code in PR #13402:
URL: https://github.com/apache/hudi/pull/13402#discussion_r2145324311


##########
hudi-client/hudi-client-common/src/main/java/org/apache/hudi/client/BaseHoodieTableServiceClient.java:
##########
@@ -316,33 +317,38 @@ protected HoodieWriteMetadata<O> compact(HoodieTable<?, 
I, ?, T> table, String c
     }
     compactionTimer = metrics.getCompactionCtx();
     HoodieWriteMetadata<T> writeMetadata = table.compact(context, 
compactionInstantTime);
-    HoodieWriteMetadata<O> compactionWriteMetadata = 
convertToOutputMetadata(writeMetadata);
+    HoodieWriteMetadata<T> processedWriteMetadata = 
processWriteMetadata(table, writeMetadata, compactionInstantTime);
+    HoodieWriteMetadata<O> compactionWriteMetadata = 
convertToOutputMetadata(processedWriteMetadata);
     if (shouldComplete) {
       commitCompaction(compactionInstantTime, compactionWriteMetadata, 
Option.of(table));
     }
     return compactionWriteMetadata;
   }
 
+  protected HoodieWriteMetadata<T> processWriteMetadata(HoodieTable table, 
HoodieWriteMetadata<T> writeMetadata, String instantTime) {
+    return writeMetadata;
+  }
+
   public void commitCompaction(String compactionInstantTime, 
HoodieWriteMetadata<O> compactionWriteMetadata, Option<HoodieTable> tableOpt) {
     // dereferencing the write dag for compaction for the first time.
-    List<HoodieWriteStat> writeStats = 
triggerWritesAndFetchWriteStats(compactionWriteMetadata);
+    Pair<List<HoodieWriteStat>, List<HoodieWriteStat>> 
dataTableAndMetadataTableHoodieWriteStats = 
triggerWritesAndFetchWriteStats(compactionWriteMetadata);
     // Fetch commit metadata from HoodieWriteMetadata and update 
HoodieWriteStat
-    
CommonClientUtils.stitchCompactionHoodieWriteStats(compactionWriteMetadata, 
writeStats);
+    
CommonClientUtils.stitchCompactionHoodieWriteStats(compactionWriteMetadata, 
dataTableAndMetadataTableHoodieWriteStats.getKey());

Review Comment:
   each of them are used just once. So, I left it as is.



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