codope commented on code in PR #9041:
URL: https://github.com/apache/hudi/pull/9041#discussion_r1246655286


##########
hudi-client/hudi-client-common/src/main/java/org/apache/hudi/index/HoodieIndexUtils.java:
##########
@@ -310,6 +312,56 @@ public static <R> HoodieData<HoodieRecord<R>> 
mergeForPartitionUpdates(
             return Arrays.asList(deleteRecord, getTaggedRecord(merged, 
Option.empty())).iterator();
           }
         });
-    return taggedUpdatingRecords.union(newRecords);
+    return taggedUpdatingRecords.union(taggedNewRecords);
+  }
+
+  public static <R> HoodieData<HoodieRecord<R>> tagGlobalLocationBackToRecords(
+      HoodieData<HoodieRecord<R>> incomingRecords,
+      HoodiePairData<String, HoodieRecordGlobalLocation> 
keyAndExistingLocations,
+      boolean mayContainDuplicateLookup,
+      boolean shouldUpdatePartitionPath,
+      HoodieWriteConfig config,
+      HoodieTable table) {
+    final HoodieRecordMerger merger = config.getRecordMerger();
+
+    HoodiePairData<String, HoodieRecord<R>> keyAndIncomingRecords =
+        incomingRecords.mapToPair(record -> Pair.of(record.getRecordKey(), 
record));
+
+    // Pair of incoming record and the global location if meant for merged 
lookup in later stage
+    HoodieData<Pair<HoodieRecord<R>, Option<HoodieRecordGlobalLocation>>> 
incomingRecordsAndLocations
+        = keyAndIncomingRecords.leftOuterJoin(keyAndExistingLocations).values()
+        .map(v -> {
+          final HoodieRecord<R> incomingRecord = v.getLeft();
+          Option<HoodieRecordGlobalLocation> currentLocOpt = 
Option.ofNullable(v.getRight().orElse(null));
+          if (currentLocOpt.isPresent()) {
+            HoodieRecordGlobalLocation currentLoc = currentLocOpt.get();
+            boolean shouldPerformMergedLookUp = mayContainDuplicateLookup
+                || !Objects.equals(incomingRecord.getPartitionPath(), 
currentLoc.getPartitionPath());
+            if (shouldUpdatePartitionPath && shouldPerformMergedLookUp) {
+              return Pair.of(incomingRecord, currentLocOpt);
+            } else {
+              // - When update partition path is set to false,
+              //   the incoming record will be tagged to the existing record's 
partition regardless of being equal or not.
+              // - When update partition path is set to true,
+              //   the incoming record will be tagged to the existing record's 
partition
+              //   when partition is not updated and the look-up won't have 
duplicates (e.g. COW, or using RLI).
+              return Pair.of((HoodieRecord<R>) getTaggedRecord(
+                      createNewHoodieRecord(incomingRecord, currentLoc, 
merger), Option.of(currentLoc)),
+                  Option.empty());
+            }
+          } else {
+            return Pair.of(getTaggedRecord(incomingRecord, Option.empty()), 
Option.empty());
+          }
+        });
+    return shouldUpdatePartitionPath
+        ? mergeForPartitionUpdatesIfNeeded(incomingRecordsAndLocations, 
config, table)

Review Comment:
   yeah we need to consider duplicates, otherwise we'll have to special-case 
for RLI.



##########
hudi-client/hudi-client-common/src/main/java/org/apache/hudi/metadata/HoodieBackedTableMetadataWriter.java:
##########
@@ -459,11 +459,6 @@ private Pair<Integer, HoodieData<HoodieRecord>> 
initializeRecordIndexPartition()
     final HoodieMetadataFileSystemView fsView = new 
HoodieMetadataFileSystemView(dataMetaClient,
         dataMetaClient.getActiveTimeline(), metadata);
 
-    // MOR tables are not supported
-    if (!dataMetaClient.getTableType().equals(HoodieTableType.COPY_ON_WRITE)) {
-      throw new HoodieMetadataException("Only COW tables are supported with 
record index");
-    }
-

Review Comment:
   Would prefer to land it in a separate commit. I guess #9017 will land 
earlier anyway.



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