[GitHub] [hudi] nsivabalan commented on a change in pull request #1704: [HUDI-115] Enhance OverwriteWithLatestAvroPayload to also respect ordering value of record in storage

[GitBox <gi...@apache.org>]

nsivabalan commented on a change in pull request #1704:
URL: https://github.com/apache/hudi/pull/1704#discussion_r465956954



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File path: hudi-common/src/main/java/org/apache/hudi/common/model/OverwriteWithLatestAvroPayload.java
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@@ -91,4 +94,37 @@ private boolean isDeleteRecord(GenericRecord genericRecord) {
     Object deleteMarker = genericRecord.get(deleteMarkerField);
     return (deleteMarker instanceof Boolean && (boolean) deleteMarker);
   }
+
+  @Override
+  public Option<IndexedRecord> combineAndGetUpdateValue(IndexedRecord currentValue, Schema schema, Map<String, String> props) throws IOException {
+    if (recordBytes.length == 0) {
+      return Option.empty();
+    }
+    GenericRecord incomingRecord = bytesToAvro(recordBytes, schema);
+    /*
+     * Combining strategy here returns currentValue on disk if incoming record is older.
+     * The incoming record can be either a delete (sent as an upsert with _hoodie_is_deleted set to true)
+     * or an insert/update record. In any case, if it is older than the record in disk, the currentValue
+     * in disk is returned (to be rewritten with new commit time).
+     *
+     * NOTE: Deletes sent via EmptyHoodieRecordPayload and/or Delete operation type do not hit this code path
+     * and need to be dealt with separately.
+     */
+    Comparable persistedOrderingVal = (Comparable) getNestedFieldVal((GenericRecord) currentValue, props.get(ORDERING_FIELD_OPT_KEY), false);
+    Comparable incomingOrderingVal = (Comparable) getNestedFieldVal(incomingRecord, props.get(ORDERING_FIELD_OPT_KEY), false);

Review comment:
       if schema got evolved and the ordering field for incoming record does not exist in existing storage, this might throw NPE. 




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