JunRuiLee opened a new pull request, #7904:
URL: https://github.com/apache/paimon/pull/7904

   
   
   ### Purpose
   Java supports replacing an existing tag with a new snapshot via 
Table.replaceTag() and Spark's ReplaceTagProcedure. pypaimon currently lacks 
this capability. 
   Users who want to update a tag (e.g. periodically refreshing a latest-prod 
tag to point to the newest snapshot) must delete and re-create it, leaving a 
window where the tag does not exist. replace_tag provides atomic replacement 
semantics.
   
   ### Tests
   - Replace an existing tag to a specified snapshot_id
   - Replace with snapshot_id=None uses the latest snapshot
   - Replacing a non-existent tag raises ValueError
   - Replacing with a non-existent snapshot_id raises ValueError


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