jackylee-ch opened a new pull request, #942:
URL: https://github.com/apache/paimon-rust/pull/942

   Java exposes `sys.rename_branch(table, from_branch, to_branch)` to rename a 
branch. The core `BranchManager::rename_branch` primitive already existed; only 
the DataFusion `CALL` procedure was missing.
   
   This registers `rename_branch`: it declares the 
`table`/`from_branch`/`to_branch` parameters so a misspelled argument is 
rejected, and dispatches to `BranchManager`, which already validates that the 
source branch exists, the target name is free, and neither is `main`.
   
   Tested end-to-end: seed a branch, CALL rename_branch, assert the old name is 
gone from `$branches` and the new one is present; renaming a missing branch 
errors.
   


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