Priya2996 commented on issue #20473:
URL: https://github.com/apache/arrow/issues/20473#issuecomment-6302040970

   I reproduced this behavior on current Arrow main in the Parquet Datase 
`pre_buffer=true` path.
   
   I have implemented a patch that reuses the existing RecordBatchReader logic 
to decode row groups incrementally according to `batch_size`, instead of 
decoding the complete row group before slicing it.
   
   The `pre_buffer=false` path remains unchanged. I’ll open a PR linked to this 
issue with regression tests. 


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