TaoZex commented on code in PR #2748:
URL: https://github.com/apache/incubator-paimon/pull/2748#discussion_r1470636068


##########
paimon-core/src/main/java/org/apache/paimon/utils/BranchManager.java:
##########
@@ -72,6 +73,9 @@ public Path branchPath(String branchName) {
     }
 
     public void createBranch(String branchName, String tagName) {
+        checkArgument(
+                !branchName.equals(DEFAULT_MAIN_BRANCH),
+                "Branch name 'main' is the default branch and cannot be 
used.");
         checkArgument(!StringUtils.isBlank(branchName), "Branch name '%s' is 
blank.", branchName);
         checkArgument(!branchExists(branchName), "Branch name '%s' already 
exists.", branchName);
         checkArgument(tagManager.tagExists(tagName), "Tag name '%s' not 
exists.", tagName);

Review Comment:
   The branchExists method already checks the branch path.



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