alamb commented on pull request #1556:
URL: 
https://github.com/apache/arrow-datafusion/pull/1556#issuecomment-1013246630


   @ic4y  @tustvold  mentioned to me in passing that one of the differences in 
memory usage might be related to parquet2 decoding entire pages at a time 
rather than reading them out in smaller batches. I am not sure if that matches 
your observations 


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