dramaticlly commented on code in PR #13631:
URL: https://github.com/apache/iceberg/pull/13631#discussion_r2229729546


##########
core/src/main/java/org/apache/iceberg/BaseTransaction.java:
##########
@@ -121,180 +121,143 @@ public TableOperations underlyingOps() {
     return ops;
   }
 
-  private void checkLastOperationCommitted(String operation) {
+  protected <T extends PendingUpdate> T appendUpdates(T update) {
+    if (!(update instanceof ManageSnapshots)) {

Review Comment:
   Let me see if this mermaid chart helps, 
   - solid arrow for extend class
   -  dotted line for implements interface
   ```mermaid
   classDiagram
       class SnapshotUpdate {
         <<interface>>
       }
       class AppendFiles {
         <<interface>>
       }
       class SnapshotProducer {
         <<abstract class>>
       }
       class FastAppend {
       }
       class PendingUpdate {
          <<interface>>
       }
   
       PendingUpdate <|-- SnapshotUpdate
       SnapshotUpdate <|-- AppendFiles
       SnapshotUpdate <|.. SnapshotProducer
       AppendFiles <|.. FastAppend
       SnapshotProducer <|-- FastAppend
       FastAppend : implements AppendFiles
       FastAppend : extends SnapshotProducer
   
       BaseTransaction o-- FastAppend: instantiate
   ```
   



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