lvyanquan commented on code in PR #4588:
URL: https://github.com/apache/flink-cdc/pull/4588#discussion_r4344982488


##########
flink-cdc-connect/flink-cdc-pipeline-connectors/flink-cdc-pipeline-connector-iceberg/src/main/java/org/apache/flink/cdc/connectors/iceberg/sink/v2/IcebergWriter.java:
##########
@@ -140,35 +140,44 @@ public Collection<WriteResultWrapper> prepareCommit() 
throws IOException {
         return list;
     }
 
-    private RowDataTaskWriterFactory getRowDataTaskWriterFactory(TableId 
tableId) {
+    private TableWriterFactory getTableWriterFactory(TableId tableId) {
         Table table = 
catalog.loadTable(TableIdentifier.parse(tableId.identifier()));
         RowType rowType = FlinkSchemaUtil.convert(table.schema());
+        List<Integer> equalityFieldIds = new 
ArrayList<>(table.schema().identifierFieldIds());
         RowDataTaskWriterFactory rowDataTaskWriterFactory =
                 new RowDataTaskWriterFactory(
                         table,
                         rowType,
                         DEFAULT_MAX_FILE_SIZE,
                         FileFormat.fromString(DEFAULT_FILE_FORMAT),
                         new HashMap<>(),
-                        new ArrayList<>(table.schema().identifierFieldIds()),
+                        equalityFieldIds,
                         true);
         rowDataTaskWriterFactory.initialize(taskId, attemptId);
-        return rowDataTaskWriterFactory;
+        // Match the factory's actual append/delta writer selection, even for 
existing tables
+        // whose identifier fields differ from the incoming CDC schema's 
primary key.
+        return new TableWriterFactory(rowDataTaskWriterFactory, 
!equalityFieldIds.isEmpty());
     }
 
     @Override
     public void write(Event event, Context context) throws IOException {
         if (event instanceof DataChangeEvent) {
             DataChangeEvent dataChangeEvent = (DataChangeEvent) event;
             TableId tableId = dataChangeEvent.tableId();
-            writerFactoryMap.computeIfAbsent(tableId, 
this::getRowDataTaskWriterFactory);
-            TaskWriter<RowData> writer =
-                    writerMap.computeIfAbsent(
-                            tableId, tableId1 -> 
writerFactoryMap.get(tableId1).create());
+            TableWriterFactory writerFactory =
+                    writerFactoryMap.computeIfAbsent(tableId, 
this::getTableWriterFactory);
             TableSchemaWrapper tableSchemaWrapper = schemaMap.get(tableId);
             List<RowData> rowDataList =
                     RowDataUtils.convertDataChangeEventToRowData(
-                            dataChangeEvent, 
tableSchemaWrapper.getFieldGetters());
+                            dataChangeEvent,
+                            tableSchemaWrapper.getFieldGetters(),
+                            writerFactory.supportsEqualityDeletes);

Review Comment:
   Thanks for pointing this out! I've updated the fix and added regression 
tests.



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