Jefffrey commented on PR #9445:
URL: https://github.com/apache/arrow-rs/pull/9445#issuecomment-6438254019

   (speaking to the overall direction since I haven't fully code reviewed this)
   
   I don't have any issues with adding this new field to `RecordBatch`; I was 
initially hesitant in adding an IPC specific field to a core struct, since 
we've had issues where trying to rip it out is painful:
   
   - https://github.com/apache/arrow-rs/issues/5981 it's a bit hard to try 
remove `dict_id` from `Field`...
   
   But this seems to have broader potential in its usecase 👍 
   
   And I don't think there's technically a "spec" for RecordBatch? It seems 
pyarrow at least doesn't put this metadata on its core RecordBatch class


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