danny0405 commented on code in PR #13742:
URL: https://github.com/apache/hudi/pull/13742#discussion_r2300803147
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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:
Based on the changes in the patch, using `HoodieRecord` brings in a lot of
intricate changes in write merging, buffered record mergers and deletes
handling in mergers themself, making the bar very high to make the behavior
correct and consistent among multiple engine, that I prefer we have a "change
record" abstraction here to simply the things, or just use `BufferedRecord`
because it is a very near abstaction and it has been widely used in merging
now(just to name it better as a developer/user API).
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