Rich-T-kid opened a new issue, #11719:
URL: https://github.com/apache/arrow-rs/issues/11719

   `BatchCoalescer` currently routes dictionary arrays through 
`GenericInProgressArray`, which buffers intermediate arrays and concatenates 
them when completing an output batch.
   
   Implement a specialized `InProgressArray` for dictionary arrays to avoid 
this generic concat path.


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