mkoistinen commented on issue #34758:
URL: https://github.com/apache/arrow/issues/34758#issuecomment-2035248357

   > I think the issue you are seeing is that **Dataset.to_batches() doesn't 
combine row groups, so if your row groups are smaller than a batch size you 
will get smaller batches.** You should think of batch_size here as an upper 
bound.
   
   This should *really* be in the documentation: 
https://arrow.apache.org/docs/python/generated/pyarrow.dataset.Dataset.html#pyarrow.dataset.Dataset.to_batches


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