danny0405 commented on code in PR #12796:
URL: https://github.com/apache/hudi/pull/12796#discussion_r1960988732


##########
hudi-flink-datasource/hudi-flink/src/test/java/org/apache/hudi/sink/bucket/ITTestBucketStreamWrite.java:
##########
@@ -91,7 +97,20 @@ public void 
testBucketStreamWriteAfterRollbackFirstFileGroupCreation(boolean isC
     }
   }
 
-  private static void doDeleteCommit(String tablePath, boolean isCow) throws 
Exception {
+  @ParameterizedTest
+  @ValueSource(booleans = {true, false})
+  public void testBucketWriteIntoMultipleBuckets(boolean isCow) throws 
Exception {
+    String tablePath = tempFile.getAbsolutePath();
+    doWrite(tablePath, isCow, 2, "upsert");
+    if (isCow) {
+      TestData.checkWrittenDataCOW(tempFile, EXPECTED_LIST);

Review Comment:
   why test COW with different data list?



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