yihua commented on code in PR #9883:
URL: https://github.com/apache/hudi/pull/9883#discussion_r1369126255


##########
hudi-common/src/main/java/org/apache/hudi/common/table/read/HoodieBaseFileGroupRecordBuffer.java:
##########
@@ -126,12 +128,13 @@ protected Option<T> doProcessNextDataRecord(T record,
       // Merge and store the combined record
       // Note that the incoming `record` is from an older commit, so it should 
be put as
       // the `older` in the merge API
+
       HoodieRecord<T> combinedRecord = (HoodieRecord<T>) recordMerger.merge(
-          readerContext.constructHoodieRecord(Option.of(record), metadata, 
readerSchema),
-          readerSchema,
+          readerContext.constructHoodieRecord(Option.of(record), metadata),
+          (Schema) metadata.get(INTERNAL_META_SCHEMA),
           readerContext.constructHoodieRecord(
-              existingRecordMetadataPair.getLeft(), 
existingRecordMetadataPair.getRight(), readerSchema),
-          readerSchema,
+              existingRecordMetadataPair.getLeft(), 
existingRecordMetadataPair.getRight()),
+          (Schema) 
existingRecordMetadataPair.getRight().get(INTERNAL_META_SCHEMA),
           payloadProps).get().getLeft();

Review Comment:
   When there are more log files, partial updates, and schema evolution, 
`(Schema) metadata.get(INTERNAL_META_SCHEMA)` can be different across record 
keys.



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