tustvold commented on PR #2040:
URL: https://github.com/apache/arrow-rs/pull/2040#issuecomment-1184778315

   Apologies I'm trying to review this, but I'm extremely confused as to how 
this has been and is working, I can't find where the IPC writer makes use of 
the ArrayData offset, and am therefore at a loss as to how slicing has 
historically been being preserved. Could you possibly point me at the relevant 
code, as far as I can tell it previously wrote the entirety of the buffers, but 
I can't work out how the reader then knows to ignore most of this? 


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