LinMingQiang commented on code in PR #5413:
URL: https://github.com/apache/paimon/pull/5413#discussion_r2032400484


##########
paimon-core/src/main/java/org/apache/paimon/utils/FileSystemBranchManager.java:
##########
@@ -137,8 +137,8 @@ private boolean fileExists(Path path) {
     }
 
     @Override
-    public void fastForward(String branchName) {
-        BranchManager.fastForwardValidate(branchName);
+    public void fastForward(String branchName, String currentBranch) {
+        BranchManager.fastForwardValidate(branchName, currentBranch);
         checkArgument(branchExists(branchName), "Branch name '%s' doesn't 
exist.", branchName);

Review Comment:
   Can we add a check in `FastForwardProcedure` before calling 
`table.fastForward` ?
   
   Like : 
   ```
           FileStoreTable fileStoreTable = (FileStoreTable) table(tableId);
           checkArgument(
                   
!branchName.equals(fileStoreTable.snapshotManager().branch()),
                   "Branch name '%s' do not use in fast-forward.",
                   branchName);
           fileStoreTable.fastForward(branchName);
   ```



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