[GitHub] [hudi] vinothchandar commented on a change in pull request #2248: [HUDI-1196] Update HoodieKey when deduplicating records

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

vinothchandar commented on a change in pull request #2248:
URL: https://github.com/apache/hudi/pull/2248#discussion_r528948570



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File path: hudi-client/hudi-spark-client/src/main/java/org/apache/hudi/table/action/commit/SparkWriteHelper.java
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@@ -59,10 +59,9 @@ public static SparkWriteHelper newInstance() {
     }).reduceByKey((rec1, rec2) -> {
       @SuppressWarnings("unchecked")
       T reducedData = (T) rec1.getData().preCombine(rec2.getData());
-      // we cannot allow the user to change the key or partitionPath, since that will affect
-      // everything
-      // so pick it from one of the records.
-      return new HoodieRecord<T>(rec1.getKey(), reducedData);
+      HoodieKey reducedKey = rec1.getData().equals(reducedData) ? rec1.getKey() : rec2.getKey();

Review comment:
       so if `preCombine()` is a merge, then the equals check may not succed? 




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