Dandandan commented on issue #16707:
URL: https://github.com/apache/datafusion/issues/16707#issuecomment-3048506290

   From the code it seems to me `pa.concat_arrays` is converting the input 
arrays into a single array.
   
   DataFusion won't currently split the batch into smaller batches as of now, 
so the aggregation for a single array/batch will use a single thread only.


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