peterxcli commented on PR #5807:
URL: 
https://github.com/apache/datafusion-comet/pull/5807#issuecomment-5651478125

   > My field-number/reservation request is therefore a schema-maintenance 
convention, following [protobuf 
guidance](https://protobuf.dev/programming-guides/proto3/#assigning), not a 
promise of a stable mixed-version JNI ABI. The [same Comet 
policy](https://github.com/apache/datafusion-comet/blob/7e4c5e4139561f013480a39d263a936f541f5284/docs/source/about/versioning_policy.md#L59)
 explicitly excludes internal plan protobuf from its compatibility guarantees.
   
   @sunchao @andygrove my point is: if there’s no compatibility concern, this 
is a great opportunity for a code cleanup. If we keep the old code around 
indefinitely, the codebase will only grow harder to maintain. And we don’t lose 
anything by removing it -- the schema evolution is still fully traceable 
through git blame and the PR history.
   
   That said, I’m happy to keep it if there’s a compatibility case I’m missing. 
Would love to hear your thoughts.


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