danny0405 commented on code in PR #13742:
URL: https://github.com/apache/hudi/pull/13742#discussion_r2302685967
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hudi-common/src/main/java/org/apache/hudi/common/model/HoodieRecordMerger.java:
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@@ -63,8 +63,15 @@ public interface HoodieRecordMerger extends Serializable {
* It'd be associative operation: f(a, f(b, c)) = f(f(a, b), c) (which we
can translate as having 3 versions A, B, C
* of the single record, both orders of operations applications have to
yield the same result)
* This method takes only full records for merging.
+ *
+ * @param older Older record in terms of commit time ordering.
+ * @param oldSchema The schema of the older record.
+ * @param newer Newer record in terms of commit time ordering.
+ * @param newSchema The schema of the newer record.
+ * @param props The additional properties for the merging operation.
+ * @return The merged record and schema. The record is expected to be
non-null. If the record represents a deletion, the operation must be set as
{@link HoodieOperation#DELETE}.
*/
- Option<Pair<HoodieRecord, Schema>> merge(HoodieRecord older, Schema
oldSchema, HoodieRecord newer, Schema newSchema, TypedProperties props) throws
IOException;
+ Pair<HoodieRecord, Schema> merge(HoodieRecord older, Schema oldSchema,
HoodieRecord newer, Schema newSchema, TypedProperties props) throws IOException;
Review Comment:
> there is no way to currently pass in the payload information to the
HoodieAvroRecordMerger
We can, just let the T in BufferedRecord be the payload instance? For
HoodieRecord, we did the similiar thing, the T can be eigher engine row or a
payload instance. If we assume all the buffered records takes payload instance
for payload based merging, it should work. It's just that we can not have a
generic type T on the params `BufferedRecord`.
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